March 4, 2011Now that I`ve replaced my head gasket had the head machined and installed a new themostate the engine doesn`t seam to want to maintaine any heat in the coolant. Is this somthing I need to worry about It will build to about 170 180 while sitting still but ounce you start driveing it drops to the lowest part of the guage at 140. the outside temp was in the lower 40s when I drove it but I would still think it should maintain normal operating temps while driving. Am I just being paranoid or do I have a major issue? Is it time to head to the dealer to trader her in? I alwas did want a quad cab!
Forums : Diesel Engines : new head gasket installed now coolant too cool? (614 Views)
March 5, 2011Sounds like the thermostat isn`t working properly (not closing). But I say go for the QC!! Temp should be up around 200-210.
March 5, 2011That is what I thought too. after I test drove it for the first time since the work done to it and noticed the problem I went and picked up another new thermostate and installed it. the new one I removed was closed unless they both are oppening way too soon? I`m half tempted to put the original one back in! At least it was consistantly staying around 190.
March 5, 2011Could just be bad thermostats or the wrong one... Maybe a problem with the temp sensing unit, and or the gauge?
March 5, 2011It`s not the guage the engine will just phisically not build any heat in the cooling system unless you let it idle for a half hour. But as soon as you start driveing the guage drops back to the bottom. It doesn`t even produce enough heat to get any heat from the heater.
This may be a dumb question but is it possible to install the thermostate backwards? The head was off for a while and when reinstalling the thermostate it seamed like it would only fit one way with the long spring end faceing towards the themostate housing. It seams like most cars I have installed thermostats in went the other direction. Could that couse the problems I`ve described? and will it fit the other direction?
March 5, 2011The spring side goes in the head first.
March 5, 2011have you bled the system for air?
March 6, 2011I don`t think it is air in the system. I`m gonna pull the thermostate out in the morning and try to turn it around. Hopefully that will fix the problem. thanks.
March 6, 2011Fan clutch perhaps? If your fan clutch is locked up it will spin at the same rpm as the motor all the time which means when you are driving the fan is pulling air through the radiator even though the motor has not warmed up yet which seems consistent with your current symptoms. Try to spin the fan with your hand, obviously with the motor off. A properly functioning clutch should offer some resistance to fan rotation. If the fan spins freely without resistance or you can`t budge the thing that part could be your problem and is a fairly easy fairly inexpensive fix.
March 8, 2011Well the truck is back on the raod again just in time for the fuel prices to go back up to the roof! It was the thermostate. I put it in backwards. It just didnt seam like it had the clearence for it to fit in the head that way but I guess if does. thanks for all the help.
March 9, 2011Sweet. Now you can drive in warmth again. lol