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Old 03-28-2011, 09:30 PM
mudgoat mudgoat is offline
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Default jet performance 180 thermostat question

This weekend i installed one of the jet performance thermostats, I have the stage 1 chip in my truck already. Everything seemed to work fine for the 1 or 2 i was out after installing it, but now today in the morning my truck wouldn't blow hot air and it would spike up to really hot then go back down to the medium mark then the hot air would blow, then i look down and the needle is half way between cold and medium temperature and it was blowing hot air, but then it would go back up and it would blow cold air for a bit.

Basically the temperature gauge is all over the place, and the heat is cold and hot, So i am wondering if anyone else has had the same problem as me at all when installing this or what You think could be causing this. I did put the little pin at 12 o'clock as i seen on a how to video on you tube. and the reason i changed it was because it was leaking from that housing, and it always smelt like burnt coolant, since then its stopped leaking and doesn't smell anymore.

Now i might have a big air lock but the radiator hose is full of coolant, however it hasn't sucked much out of the coolant reservoir either since i installed the new thermostat, which seems kinda weird.

Anyways if someone could give me some advice or if they have had similar problems. That would be appreciated.

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Old 03-28-2011, 10:13 PM
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Hmmmmm.... I am running that same thermostat and have had 0 issues. At running temp my gauge reads about half way between cold and half. Have you tried taking off the radiator cap and starting it up and letting it run till it reaches temp and see if the radiator level drops at all? Air in the line is the only thing that I could think of, but I am not a mechanic. I only lost about half a gallon of coolant during my swap, so I ran it to temp with cap off and added new coolant so there would be no air in the line. Hope you get that worked out. May be a defective thermostat.
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Old 03-30-2011, 06:30 AM
chopperman chopperman is offline
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Classic example of air in the system. You introduced air into the system as soon as you took off the thermostat. Check your overflow tank to see if the level rises or not. Most likley going to have to purge the air out of it, not hard to do.
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Old 04-01-2011, 11:48 AM
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i installed mine about a month ago and it was always steady between cold and half on the gauge, but now it moves alot from 180 to 200 when idleing, i seems that the tstat is closing and opening too much it should stay open when at 180 , it drops fast when it reaches 200 i suspect faulty t stat
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Old 04-10-2011, 12:24 AM
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Hope you go this resolved by now...

It won't pull from the bottle very well when there is still air in the system. after the truck has cooled off, check the level and top off as necessary until the level no longer goes down. You can also run it up till the thermostat opens with the cap off to get any air out of the block.
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