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Excessive Cooling

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  #1  
Old 03-13-2018, 08:44 AM
Ebarger
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Default 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 itís 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
 
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  #2  
Old 03-13-2018, 08:56 AM
RalphP
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Your new thermostat is hung open.

RwP
 
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Old 03-13-2018, 09:00 AM
Ebarger
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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. Itís not a thermostat problem I have installed two brand new ones inside of two weeks
 
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Old 03-13-2018, 09:37 AM
RalphP
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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
 
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Old 03-13-2018, 09:40 AM
Ebarger
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I installed a 195 degree thermostat. The first one was a crappy brand the second was a more expensive brand. I will see what the temperatures are and get back thanks
 
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Old 03-13-2018, 10:07 AM
Ebarger
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If the thermostat is new and everything appears to be running on the truck why is the thermostat staying open? It canít be because itís faulty.
 
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Old 03-13-2018, 10:35 AM
RalphP
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Originally Posted by Ebarger View Post
If the thermostat is new and everything appears to be running on the truck why is the thermostat staying open? It canít be because itís faulty.
Those are famous last words.

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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Old 03-13-2018, 10:47 AM
onemore94dak
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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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Old 03-13-2018, 03:57 PM
Ebarger
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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
 
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Old 03-13-2018, 04:54 PM
onemore94dak
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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.
 
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