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Have a question, I just replaced the WP and TStat on the truck and now finding that it takes a very long time for the truck to come up to temp. Previously, it would come up to temp in a few minutes. Now, the needle barely enters the very edge of the actual temperature range over the same time/distance. Is it possible for new a thermostat to fail open? The one I put in was just your garden variety from Advance Autoparts.
Why did you replace the thermostat initially? Do you still have it?
Thanks for the comments. I'll pick up a Motorcraft thermostat this week. I replaced it since I had a leaking WP and was right in there anyway and with all the coolant drained it seemed like a good idea at the time. In hindsight maybe not since the other one seemed to be working fine. I'll be sure to test the new one. I guess I could throw the one that's coming out in some hot water and see what happens. I talked to some guys at a shop and they suggested that it might have slipped when I installed it, but they said that usually when that happens the housing will crack when you tighten the bolts and so far as I can tell that didn't happen. I guess I'll know more when I pull it off.
Did you put in the same temperature rated T-Stat as the one you removed?
Yep, it's a 195 DEG thermostat.
^^^^^^ Always use Motorcraft when it comes to the Cooling System and the Ignition system.
Sincerely appreciate that, been away from Fords for about 20 years, so go to know.
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