Excessive Cooling
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Excessive Cooling
My 98 Dakota with a 318 has excessive cooling issues. I replaced the water pump this past weekend cause it was leaking and along with it I put in a new thermostat and the operating temperature is around 150. The coolant system has no air in it and it has the proper coolant levels. My dad thinks it’s the radiator fan and that it is enhanced causing excessive cooling. I heard you are suppose to replace the clutch fan the same time as the water pump. Could it be something else? I have not flushed the system but the heater core lines coming out of the firewall are both warm. One thing I noticed is that after running it for about 20 minutes the return line to the radiator is still cool. Any coorilation?
thanks
thanks
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I installed a thermostat about a week ago when I had the same issue. I installed another new one this past weekend and still the same issue. It’s not a thermostat problem I have installed two brand new ones inside of two weeks
Champion
Joined: Jan 2013
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From: Northwest Louisiana
What temp thermostat are you using? Your symptom is one of the cooling system running unrestricted; again, that thermostat's open.
Doesn't matter if you keep putting a crap brand thermostat in every time, BTW.
But take a non-contact thermometer, and shoot the exhaust manifolds; shoot the intake; shoot the thermostat housing. See what temps you're getting.
RwP
Doesn't matter if you keep putting a crap brand thermostat in every time, BTW.
But take a non-contact thermometer, and shoot the exhaust manifolds; shoot the intake; shoot the thermostat housing. See what temps you're getting.
RwP
Champion
Joined: Jan 2013
Posts: 4,737
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From: Northwest Louisiana
But do consider - if they never failed, would they need a warranty?
Thermostats DO fail; failing open beats failing closed.
RwP
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Champion
Joined: Sep 2013
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It's a pain but if you wanted to ease your own mind about whether or not the thermostat is opening and closing you can remove it, and boil a pot of water, take the pot off the heat and put the thermostat in it and watch to see if it opens or moves or???. If you are in a really cold climate try partially blocking the front of the radiator with cardboard.
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So I took out the thermostat and tested it in water and it worked fine opened up then when cooler it closed. I also put cardboard in front of the radiator and still reading at about 150-160. Still confused
Champion
Joined: Sep 2013
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Is the motor running well? Could one or two of the cylinders be missing? Here is a page to check your fan clutch.
https://itstillruns.com/test-fan-clutch-5086903.html
Looks like they are about $40+- on rock auto if its bad. I don't have any other ideas.
https://itstillruns.com/test-fan-clutch-5086903.html
Looks like they are about $40+- on rock auto if its bad. I don't have any other ideas.