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Unread 02-05-2006, 02:14 PM   #1
Achped
Registered User
1999 TJ Wrangler 
 
Join Date: Oct 2005
Location: , Florida
Posts: 1,419
Running cold....when hot...

'99 2.5L 60,800 miles

I had a wildly fluctuating temp gauge yesterday, I'd be driving around for....hours and it'd only be at 110 degrees, then shoot up to 1/4 of the way, then back down to 100. It even varied with turns and braking!

Took apart the t-stat housing and noticed the gasket was put in backwards (gasket on the engine, not on the housing).

Fixed it and put in a new 195* t-stat.

I drove it around and it was PERFECT. I can't emphasize how much better it drove. Idled smoothly, more power. Awesome drive...but it was only on water.

Drained the radiator and filled it with 50/50 anti-freeze.

Then I was spraying something next to the jeep and accidentally got some water on the inside (near the battery/distributor) and I got a check engine light. I pulled the neg terminal and let it dry out.

Started it up and idled rough (re-learning I guess?) but my temp was no longer normal. Now it doesn't fluctuate, but it still doesn't get anywhere near 210...stays at around 180ish.

I think I have a leak in one of my heater hoses though, would this cause that? Other than that, there's nothing wrong with my cooling system.

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Unread 02-05-2006, 02:36 PM   #2
gumcrew2
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1991 XJ Cherokee 
 
Join Date: Oct 2004
Location: Denver, CO
Posts: 1,184
Hmm, doesn't sound to crazy to me, I'd be happy with it really. Only down side is that it never gets to "operating temperature" so you'll lose 1-2 mpg. On mine I got a new electric fan to replace the stock electric one (ebay $65) and I built in an override switch. Now when it's in "normal" mode it still kicks in at 210 and immediately drops to like 170! I love it. On a hot day I can let it get to 220 (have the fan on "off") and then turn it on and leave it on and it'll drop to 145.
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