Truck won't warm up.Is it my thermostat or do I need to replace my coolant? - Dodge Cummins Diesel Forum
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Old 12-01-2011, 03:26 PM   #1 (permalink)
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Truck won't warm up.Is it my thermostat or do I need to replace my coolant?

The truck is not overheating, it's just the opposite. I drive about an hour to work and some mornings when it's 35 or lower outside my truck will not come up off of 140 during the whole drive. On warmer days it will come up but never even makes it to 190, anybody have a clue what's going on? I just don't want to start throwing parts and money at it until I figure out what's actually going on.
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Old 12-01-2011, 03:33 PM   #2 (permalink)
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Would almost certainly be the thermostat. Mine did exactly the same thing a couple years ago. New thermostat-problem solved.
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Old 12-01-2011, 05:27 PM   #3 (permalink)
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Talking Thermostat

Likely the thermostat,
Mine did same thing, wouldnt warm up.
The rubber gasket around my thermostat was torn.
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Old 12-01-2011, 05:49 PM   #4 (permalink)
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Quote:
Originally Posted by Russ Roth View Post
Would almost certainly be the thermostat. Mine did exactly the same thing a couple years ago. New thermostat-problem solved.


Don't Cheap out either Cummins or NAPA Gold, I would also flush your system and change the coolant if not done recently.
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Old 12-01-2011, 08:36 PM   #5 (permalink)
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Thermostat stuck open?
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Old 12-01-2011, 10:45 PM   #6 (permalink)
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yep had the gasket in the thermostat too. It has to be the easiest thermostat I have ever put in. A 5/16 socket and 3 bolts it would be a great time to change coolant as you will lose some to replace the thermostat.
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Old 12-01-2011, 11:18 PM   #7 (permalink)
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Take advice and use the NAPA part. It much cheaper and does not allow for as much temp flucation.
To completelly flush the system it is practical to remove water pump. That way you gea ALL the coolant out and can actually wash the water jacket out. Also the ONLY way to get the correct 6 gallon fill. Take heater hose off at head and flush with garden hose. When filling let coolant come up to open fitting and install hose. Now you got no traped air in system.
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Old 12-01-2011, 11:36 PM   #8 (permalink)
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get your stat from Napa because Cummins is on national backorder for them right now unless your local shop has one instock.
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Old 12-02-2011, 08:28 PM   #9 (permalink)
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Thanks everybody. I'll search for it but in case I don't find it...anybody got a pic of where it's located in the engine bay?
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Old 12-02-2011, 11:13 PM   #10 (permalink)
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NAPA has a 180 and a 190 degree both for our engines. Anyone know which one it is?

NAPA AUTO PARTS
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Old 12-03-2011, 12:33 AM   #11 (permalink)
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Originally Posted by af1cummins View Post
NAPA has a 180 and a 190 degree both for our engines. Anyone know which one it is?

NAPA AUTO PARTS
Your Cummins wants to run at 190 part # 375190
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Old 12-03-2011, 03:00 AM   #12 (permalink)
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Your Cummins wants to run at 190 part # 375190
That's the one, IMHO.
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