2000 Dodge Durango thermostat

Tiny
GARY GERTZ
  • MEMBER
  • 2000 DODGE DURANGO
  • V8
  • 4WD
  • AUTOMATIC
  • 97,000 MILES
My Durango shows that it runs cold, the gage indecator stays between the 130 mark and the first line. Could the thermostat be stuck open? Last summer when pulling my trailor, when going up hill, the indicator would go way up, when going down hill, the indector would go down, but never over heated. They put a new heavy duty fan clutch in, never had that problem again, but now it runs cold with the indecator never going past the first line. Could this be the thermostat? Can this hurt the engine if not changed? Will it hurt the engine if it runs cold? Could the radiator in clogged? I did put in a new radiator cap in. I do not drive the Durango very much.
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Friday, January 1st, 2010 AT 8:25 PM

6 Replies

Tiny
MERLIN2021
  • EXPERT
Check the thermostat, it could possiblre make your engine run in open loop, here's the side effects.
* Coolant Thermostat monitor. On 2000 and newer vehicles, the OBD II system keeps an eye on the operation of the cooling system thermostat. Engine temperature is important because it affects emissions, fuel economy and engine wear. If the engine fails to reach normal operating temperature, it may prevent the fuel feedback system from going into closed loop. A cold engine usually requires a richer fuel mixture which wastes fuel and increases carbon monoxide emissions. A lower than normal operating temperature can also increase cylinder wear over a period of time, and blowby into the crankcase which increases oil dilution, shortens oil life and is hard on the engine's bearings. Engine coolant temperature related OBD II codes include P0115 to P0119, P0125, P0126, P0128 and P0217.
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Friday, January 1st, 2010 AT 8:35 PM
Tiny
RASMATAZ
  • MEMBER
Amen brother Mike by letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions-
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Friday, January 1st, 2010 AT 8:52 PM
Tiny
GARY GERTZ
  • MEMBER
If the thermostat is stuck in the open possision, how do you check to see if the thermostat is stuck open?
There is no warning light on.
If need to replace thermostat, what is average cost to do so?
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Friday, January 1st, 2010 AT 8:57 PM
Tiny
RASMATAZ
  • MEMBER
For what engine? 4.7 or 5.9L

For 4.7 its gonna take an 1hr that can range from $70-$130.00 per hrly labor with the thermostat at $28.15

5.9L about the same in labor/part cost
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Friday, January 1st, 2010 AT 9:03 PM
Tiny
GARY GERTZ
  • MEMBER
5.9L. How do you check out to see if the Thermostat is stuck opened? Is there a way?
Thank you for your fast response. I am iinpressed with you quick response. Gary
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Friday, January 1st, 2010 AT 9:13 PM
Tiny
RASMATAZ
  • MEMBER
Remove and Test the Thermostat
Step 1Turn off the engine and allow the engine to cool.

Step 2Remove the bolts holding the thermostat cap in place.

Step 3Lift off the housing cap to expose the thermostat. Pull the thermostat out of the housing with your fingers. Take careful note of which way it sits so that you can reinstall it or its replacement in the same position.

Step 4Put the thermostat in a pan of water on the stove, and turn the burner on high.

Step 5Monitor the water temperature with an oven thermometer. The thermostat should open at about 195 degrees F if it is functioning properly.

Step 6Replace a faulty thermostat. Reinstall it if it opens and closes properly, and look for another problem in the cooling system.

Or with the use of an infrared thermometer
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Friday, January 1st, 2010 AT 10:06 PM

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