Help: Thermostate problems?
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Joined: Sep 2009
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Help: Thermostate problems?
my truck is a 02 f350 7.3. i can drive it for half an hour and the temp gauge wont move much, it moves to just above the cold mark, not in the operating range. once i pull power up a long highway hill where i live the guage climbs a bit more but then drops back down to cold again. i think the thermostate is staying open. you get heat in the cab but it isnt very hot. the temp outside is about 5 degrees C so its not cold out yet. just wondering if someone can share some info on how to change it, i got a new state already and a square rubber o ring looking thing, do i need anything to do the job? if anyone has some input for me that would be great if they think its something else other than the thermostate that would be great. thanx
Post Fiend
Joined: Feb 2008
Posts: 10,977
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From: Lancaster, Pa.
I forget the exact size socket but drain you rad, unscrew those three screws on your housing, making sure to clean up the housing real good if your using it again, pull out the old stat, clean out the stat seat, where it sits and reinstall the new one making sure the o-ring-gasket goes on top and reinstall the housing and tourqe down the bolts. If you want, and would prolly be a good idea, run a bead of hi-temp silicone around the mating surfaces and reapply, for good measure, been seeing alot of leaks going on lately, including me..
Postmaster
Joined: Oct 2005
Posts: 2,956
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From: Northeast TN
IIRC. It's an 8mm socket to remove the thermostat housing. Like Mike said, clean it really good. I had to use a wire brush and sand paper to get all of the rust off mine. Then I painted it. So far I've been lucky. I didn't use RTV just the o-ring, no leaks yet.
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Senior User
Joined: Sep 2009
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thanx for the info guys, took it apart, things were a lil corroded but cleaned it off, replaced and well we will find out if it changed anything next drive. used a lil high temp silicone with it as well.
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paulcooper1969
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Apr 28, 2007 01:13 AM
