6.7 cummins bad thermostat symptoms

6.7 cummins bad thermostat symptoms DEFAULT


Overheating of your diesel’s engine is a relatively common and potentially serious problem. Temperature regulation is a critical component that makes your diesel engine and fuel injection system function properly. You don’t want to drive a truck that is overheating until you find out what is causing this problem. Here are the most common reasons why your diesel engine is overheating.

The text “Common Reasons Why Your Diesel Engine is Overheating” with a car thermometer icon at the center
  1. Problems with the engine coolant. The most obvious cause of engine overheating is if there is any type of issue with the engine coolant. You should perform the following checks since coolant is such a critical part of your diesel’s cooling system.
    1. Look to see if there is enough coolant in the reservoir. A low coolant level could be an indication of a leak due to cracks in the engine or head gasket. Just add more coolant and keep checking the fluid level and ground underneath your truck for signs of any leakage. Another reason that your diesel’s coolant level is low is that air pockets or bubbles may have gotten into the radiator or reservoir causing a restriction of fluid flow. Coolant is made to flow freely through all the cooling system components without any air blockages. Air pockets are usually the result of an improper flushing procedure, a loose hose clamp, or deterioration of the cylinder liner.
    1. Check the coolant quality and consistency. The ideal mixture for your diesel’s coolant is fifty percent water, 44 percent antifreeze, and 6 percent coolant conditioner. The color, odor, and acidity of the coolant should be consistent with the right combination of fluids, and this mixture should be free of dirt or debris. A coolant test kit can be used to properly analyze a coolant sample to determine if a radiator flush is needed.
  2. Malfunctioning diesel fuel injectors. If your truck’s injection system isn’t releasing fuel properly, the engine might have to work harder to compensate, causing it to overheat. There are a variety of reasons that can cause fuel injectors to not work properly, like a build-up of deposits on the injector nozzle. An inspection of the diesel injectors is pretty quick and easy to perform to help identify if there are any injector issues that are causing the engine to overheat.
  3. A malfunctioning cooling fan. A problem with the radiator fan or fan clutch will cause the engine to overheat. You can check to make sure that the fan isn’t broken or loose and is in the right position. Other causes of the cooling fan not working properly are a defective coolant sensor, engine thermostat, or fan motor. Replacing a faulty cooling fan is an easy solution to stop your engine from overheating.
  4. A faulty water pump. The water pump helps circulate coolant throughout the engine components. If the pulley that connects the water pump to the fan clutch assembly spins freely without any resistance, the water pump seals are wearing out. An inspection of the water pump and pump housing will help identify any problems. The water pump might need to be removed to check if the hoses are clogged preventing the proper flow of water.

If you have done routine maintenance checks on your diesel and the engine keeps overheating, you should bring your truck to a certified diesel mechanic immediately. The certified mechanics at Gem State Diesel in Meridian, Idaho are ready to take care of all your truck’s service and repair needs. Just give us a call at or visit us online to set up an appointment today.

Sours: https://gemstatediesel.com/4-common-reasons-your-diesel-engine-is-overheating/

Five Signs That A Cummins Water Pump Failure is Near

Few things are as devastating to a diesel engine&#;s performance as the sudden breakdown of the coolant pump. Water pump failure can quickly lead to many other problems, all of which are costly to repair.

On a Cummins engine, water pump failure can mean anything from sudden engine overheat to a literal explosion of parts off of the front of the engine block, depending on the engine in question and the type of failure.

Cummins engine

Drivers and maintenance personnel should do regular maintenance checks and include the water pump in their inspections. Here are five things to look for:

1. Weep Hole Leakage

All water pumps on a diesel engine have a &#;weep hole&#; in the water pump housing that is located around the shaft, which may produce a very slow leak. This slow leakage originates from coolant that has passed through the rotating shaft seal. The coolant will &#;weep&#; from this location, which is generally found on the underside of the pump housing (when installed).

Although leakage marks from the weep hole do not always mean that the water pump has failed, it is typically a good indicator for shaft seal wear and is the easiest way to visually verify that a water pump is functioning.

2. Leakage From Mounting Surface

Like weep hole leakage, leaks from the mounting surface can be detected visually (in most cases). These leaks may be more persistent or obvious than weep hole leaks. They indicate a more imminent failure and a more serious mechanical problem with the pump itself or its seal to the engine.

3. Loose Attachment To Engine

Any time the water pump is exposed during maintenance or repair, it should be checked for its seal against the block. Physically grabbing the water pump and wiggling it by hand is often the way that a failing &#; but not quite failed &#; pump will be detected.

Some pumps will have a viscous seal that doesn&#;t leak much when operating, even when the pump is loose, but a mechanic&#;s hand grasping the pump and wiggling up and down or side to side will detect a slight movement. A loose pump is a failure waiting to happen as the pulley/gear will be out of alignment, causing shaft stress and likely changing the pump&#;s speed intermittently, which can harm the impeller blades.

4. Squeak or Grinding From Gear/Pulley

GMB hd pump

A loose or bad pulley or bad bearings will result in a grinding or squeaking noise when the engine is running. This is most easily detected when the hood is open and a mechanic or driver is standing in front of or beside the engine.

Few diesel engine noises outside of their standard rumble and occasional turbo whine will be heard in the cab, so it&#;s imperative to get someone to listen to the engine outside if failure is suspected.

5. Corrosion Inside Pump Housing

Less common, but no less telling, are signs of corrosion. Called &#;cavitation,&#; this corrosion happens when the coolant mix is not exactly right or when there is a vacuum leak inside the cooling system itself.

The introduction of air to the cooling system will often mean that the higher pressure created by the water pump as it moves the coolant around creates bubbles (“vapor cavities”) in the liquid. These then collapse with small explosions, which can pockmark metal. Those pockmarks, especially when they happen at the pump housing&#;s seal to the engine block, can then corrode and lead to serious damage.

Any sign of corrosion, including discoloring and a &#;rough&#; appearance to the edges of the water pump housing, are a sign that things may be going badly.

Water pump sect

If you experience any one of these 5 symptoms and need to replace the water pump, be sure to get an OEM quality replacement like one of GMB&#;s heavy duty water pumps. If you have any questions about our HD water pump line, feel free to contact us!

We would love to hear your feedback! Contact [email&#;protected] to share your thoughts!

Sours: https://gmb.net/blog/cummins-water-pump-failure/
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Symptoms of a Bad or Failing Thermostat

A car thermostat regulates the flow of coolant through the engine and is an incredibly important player in the operation of your vehicle’s engine. You may hear the phrase “the thermostat was stuck open or closed.” When the engine has been sitting for a while and is not warm, the thermostat will be closed. Once the engine is running and reaches a certain operating temperature, a sensor inside the thermostat will cause it to open, allowing coolant to flow to and from the radiator, decreasing the temperature so it can be recirculated through the engine again. This constant flow (in conjunction with several other cooling system components) is what keeps your vehicle’s engine functioning at the optimum temperature.

The opening and closing of the thermostat at the correct time is critical to maintaining proper engine temperature. In the event that it happens to become “stuck” closed, there is no way for coolant to be circulated through the radiator and eventually back through the engine, which causes extremely hot engine temperatures. Likewise, if the opposite problem arises in that the thermostat is “stuck” open, the flow of coolant is constant resulting in the vehicle’s engine temperature never reaching an optimum level of heat which creates performance problems. There are several common symptoms associated with a bad or failing thermostat that will alert you that service is due.

1. Temperature gauge reading very high and engine overheating

The first and potentially most alarming symptom will be the temperature gauge reading high into the red within the first 15 minutes of your vehicle engine running. This is often the very first sign that the thermostat is not functioning properly.

2. Temperature changing erratically

Erratic temperature fluctuations can also occur causing dramatic spikes and drops in temperature which eventually leads to poor engine performance. In this case you may see the temperature abnormally low at one point and shortly after climb to an abnormally high level.

3. Coolant leaks around the thermostat housing or under the vehicle

Another indication may also be leaking coolant which can be caused by the thermostat not allowing coolant to flow when it is stuck in the closed position. This can be noticeable in a variety of locations, but most commonly around the thermostat housing. This can eventually cause other coolant hoses to leak as well resulting in coolant often times leaking on the ground under your vehicle.

Thermostat replacement is a fairly inexpensive repair to make to your vehicle, preventing potentially thousands of dollars in engine damage due to excessive heat. If any of the above symptoms sound familiar to you, it may be time to have an expert mechanic from YourMechanic come to your home or office to diagnose your vehicle.

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This article originally appeared on YourMechanic.com as Symptoms of a Bad or Failing Thermostat.

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Sours: https://www.autoblog.com//06/13/symptoms-of-a-bad-or-failing-thermostat/
2014 Ram 2500 6.7 CTD: Low Coolant Issue


Your Dodge Ram relies on a thermostat to control the temperature of the engine.  When it goes bad, you&#;ll experience a number of different problems.  Some of the most common symptoms of a bad thermostat are no heat, a spiked temp gauge, blown head gasket, and more.

Bad Thermostat Symptoms Dodge Ram


Symptoms of a Bad Thermostat:  Dodge Ram

There are a few ways that your Ram will tell you that your thermostat is bad.  Hopefully you&#;ve caught them before any damage was done.  Thermostats are very inexpensive, f you do end up needing one.  Here are the most common signs of a bad thermostat.



The most common symptom of a bad thermostat is overheating.  The thermostat doesn&#;t open up.  This keeps the coolant from entering the engine.  When this happens, the coolant in the radiator stays relatively cool, and the engine overheats fast.


Blown Head Gasket

If your Ram runs too long without coolant circulating through the engine, the head gasket can blow.  Signs of a bad head gasket include:

  • rough idle
  • bad fuel mileage
  • water in the oil
  • a lot of white smoke from the exhaust

A head gasket is a very costly and time consuming repair.  Hopefully you&#;ve caught your bad thermostat before this has happened.


Dodge Ram Bad Thermostat Diagnosis


No Heat

If your Ram has no heat at all, it is entirely possible that the thermostat is stuck open.  When this happens, coolant constantly cycles through the engine.  On very cold days, this cooling capacity is not needed, and the engine never warms up.  Here&#;s more on no heat diagnosis if this is what you are experiencing.


Warning Light or Temp Gauge Spiked

The first sign of a bad head gasket that most people are going to notice is a warning light or spiked temperature gauge.  If you&#;ve noticed this, you need to get off of the road and get your Ram&#;s engine shut down as soon as possible, before any lasting damage can occur.

A bad thermostat can cause the temp gauge or warning lights to come on.  But, it&#;s not the only reason.  Other things that can cause the temp gauge to spike are:

  • Low Coolant- If your Ram has been losing coolant, it&#;s possible that you&#;ve finally leaked out enough that the cooling system can no longer do its job.
  • Bad Radiator- If the radiator has been clogged enough that coolant can no longer pass through efficiently, your Ram will overheat.
  • Water Pump-  The water pump is responsible for pushing coolant through the radiator and the engine.  When it goes bad, water can&#;t circulate through the cooling system, even if the thermostat is open.



Coolant Leak Around the Thermostat

As pressure builds around a bad thermostat that is stuck shut, you&#;ll notice that there may be coolant leaking around the thermostat housing.  This leak is not the cause, but rather a symptom of your Ram&#;s bad thermostat.


Conclusion:  Ram Bad Thermostat Symptoms

Replacing a thermostat is a relatively affordable repair.  If you have reason to believe it&#;s gone bad, ignoring it will only end up costing a lot more money in the long run. 

Good luck diagnosing your Dodge Ram.  If there is anything that you would like to add, please leave a comment below.


Categories Dodge RamSours: https://wwwr4transmissionhq.com/dodge-ram-bad-thermostat-symptoms/

Cummins symptoms thermostat 6.7 bad

Dodge P &#; Meaning, Causes, Symptoms, &#; Fixes


Dodge Code P Definition

Coolant thermostat temperature below regulating temperature

Dodge  Code P Meaning

The powertrain control module (PCM) tracks how long it takes for the engine of your Dodge to reach and maintain the correct operating temperature. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter “closed loop” where readings from the oxygen sensors are used to maintain the efficient air to fuel ratio of Most PCMs mandate that the engine coolant temperature sensor record temperatures above º F within 15 minutes of the engine starting. Additionally, once the º F threshold is achieved, the recorded engine temperature must not fall below º F during operation. The PCM of your Dodge will record if either of these two criteria are not met. If either fault is recorded again on the next engine startup, code P is triggered.

Dodge P Symptoms

  • Check Engine Light is on
  • Higher than normal idle
  • Decreased fuel economy
  • Temperature gauge is unusually low

Dodge P Causes

(* indicates most common)

  • Stuck open thermostat*
  • Faulty coolant temperature sensor
  • Faulty wiring for coolant temperature circuit
  • Radiator fan constantly running

Dodge Code P Severity &#; Low

A stuck open thermostat is most likely the problem, however thermostats are usually designed so when they fail they are stuck open allowing full flow of the coolant protecting your engine. Check your coolant level first to make sure it is full before continuing to operate the Dodge. Overheating your engine will result in engine failure

Dodge Code P Common Diagnosis Mistakes

Many just replace the thermostat of their Dodge without checking all possible causes. Check the condition of the cooling system for rust deposits or mixture of different coolants. Make sure to flush the engine block and radiator when replacing thermostat to prevent deposits from getting stuck in the new thermostat.

Dodge Code P Diagnosis Steps

  • Tools Needed to Diagnose:

How To Diagnose P For Your Dodge

  1. Scan your Dodge to verify P is the only code present. If other codes are present, they must be addressed first.
  2. Check coolant level and condition. If there is excessive rust and  poor coolant condition this can clog up the cooling system or cause the thermostat to stick. If your coolant condition is poor, flush the coolant system and replace the coolant. If the coolant level is low, fill the coolant system and check for leaks.
  3. The coolant temperature sensor can be checked with a multimeter. The ohm reading will change with the temperature. If the ohm reading is not changing with the temperature, replace the coolant temperature sensor in your Dodge or repair the wiring for the sensor if it is damaged.
  4. The most common cause for P in a Dodge is the engine coolant thermostat is stuck open. A simple way to diagnose this is to feel the radiator hose and monitor how hot the temperature of the coolant is when it starts flowing through the radiator hose, however, you should be extremely careful when doing this as you could be burned. The hose should be barely warm until the thermostat opens. When the thermostat does open, hot coolant should start to flow and quickly warm up the radiator hose. If the radiator hose heats up slowly, the thermostat is stuck open or opening prematurely and needs to be replaced.
  • Replace thermostat with new gaskets and coolant
  • Test drive and monitor coolant temperature
  • Check for leaks


Sours: https://www.fixdapp.com/blog/pdodge/
how to replace thermostat on 6.7 cummins

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