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Old 10-04-2009, 10:22 PM   #1
Larry02451
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Default Heater Problems

My heater gets hot sometimes. At other times just warm. I have changed the thermostat three times with the same results. The heater works better when the heat indicator moves farther off of cold. Anyone had this problem??
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Old 10-05-2009, 07:57 AM   #2
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Check the radiator. Any gunk visible? If so, pull it and have it flushed at a radiator shop. Pull the water pump, check that the impeller spins with the shaft and is not loose.
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Old 10-05-2009, 09:07 AM   #3
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finish filling out your profile so we know what engine you have etc. etc, what thermostat did you use? Does your temp gauge work and does the truck warm up in the appropriate amount of time? Does the outside weather affect the heat
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Old 10-05-2009, 09:23 AM   #4
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I had a similiar problem with the truck in my profile. the engine would take a long time to warm up and the heat would be sporadic. I replace the thermostat with a napa product and it still did not work. I then changed it with a motorcraft f8cz-8575-aa. you need to make sure it is seated properly. it has worked great since then make sure coolant is filled and you burp all the air out of the system by squeezing the upper readiator hose. if you have the 2.3l i think you would use the same t-stat. the other t-stat had a sepaerat rubber gasket that did not seat properly and coolant would blow buy it thus takaing a long time to let the engine warm up
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Old 10-05-2009, 09:34 AM   #5
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I just realized you posted in the 4 banger forum so you have the 2.3L. gives us more info about the issue such as. what t-stat did you put? if the engine is not warming up quickly it is a t-stat issue. if the engine is warming up quickly it is something else. are your heater hoses hot? etc etc
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Old 10-05-2009, 01:12 PM   #6
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I do have a 2.3L. I replaced the t stat with a 195 degree t stat from auto zone. The temp. gauge barely moves off of cold. It sometimes moves a little more than others and when it does the heater gets a little warmer. Sometimes it will get pretty warm but when I turn the heater fan on high it cools back down and the temp gauge moves back toward cold again. Thanks for any Infomation.
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Old 10-05-2009, 03:38 PM   #7
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It sounds like you have the same issue I had. I might consider replacing the t stat with the motorcraft one.make sure it is seated properly in the housing If the gauge and sensor are working properly and it seems like they are the engine should heat up even if the waterpump fins were broken. I would suggest concentrating on getting the engine to properly warm up first. Then we can go from there if the heat is not working. Make sure to fill the radiator completly and burp out the air
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Old 10-05-2009, 09:20 PM   #8
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That's the same conclusion I have. I will try that.
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Old 10-05-2009, 09:32 PM   #9
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is your antifreeze full and did you check to see if your collant was flowing to the heater core good.
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Old 10-06-2009, 07:13 AM   #10
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I agree make sure the coolant is completly full and you burp any air out of the systems. I have noticed on my truck if my coolant is low or there is air that my temp gauge flucuates and that it might sho running cold but if I rev the engine while it is in park. That gauge moves up. I concluded that my coolant was low and reving the engine pushed coolant passed the sensor and made it jump.

But if the sensors and gauge are working but the engine is not warming up most likely u have a stuck open tstat the wrong tstat or an improperly installed tstat. Make sure the tstat is installed and seated correctly in the housing. You might even need to twist it a little to remove and or install it. Good luck
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