Engine/Transmission (1998.5 - 2002) Should it take a LONG time for the coolant temp gauge to move when cold?

[Murle]

I just went through this with my truck. Couldn't get it to warm up for beans. The comment about the thermostat being stuck open is partially correct. I found that the Thermostat doesn't actually stick open, rather the iner seal deteriorates and the flow of water is not interupted at the Thermostat. I replaced the thermostat and what do you know I am now back to my normal toasty truck. I run about one needle width below the 190 mark. Check the thermostat I will bet the seal around the inside of the valve is shot.

You are right my bud said that he checked his old thermostat and he said it had a rough place on it and was not closing all the way.....

 

[Nate]

The one on the right is the new one?



The one I bought the other day looks like the one on the left. I was told it was the newest revision. Looks like you bought an old stock one.

Just for extra data . . this is what my stock thermostat looked like when I pulled it out a couple years ago. I have no idea what caused this other than maybe pulling some RPM while it was closed. The new one has been working fine . .



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