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Unread 04-13-2013, 12:31 AM   #1
Nate620
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Join Date: Feb 2013
Posts: 33
noticed my temp was sitting about 150-160 and its usually at 200/210. I had my heat on defrosters as hot as possible and on a low blowing, I turned it all the way up and put it to the vents and the temp went right up to 210... I then noticed it went down to running cold once more and while I was driving I watched it and it would go back and forth between 150 and the 210 mark... Is this not good? What could be causing it? The unsteady temp was going pretty fast back and forth, it has coolant and I just changed the oil yesterday...

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Unread 04-13-2013, 01:12 AM   #2
ratmonkey
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1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
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year, engine, trim level?
basic information we need to make any kind of diagnostic attempt.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 04-13-2013, 05:05 AM   #3
Nate620
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1998 zj 4.0, limited 153k. Has the Quadratrac x case
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Unread 04-13-2013, 09:57 AM   #4
ratmonkey
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1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,794
sounds like a sticky thermostat or air in the system. i'd start by replacing the stat(only a 5$ part with a 1$ gasket) and do a coolant flush/fill. be sure to disconnect the heater core hoses and do a back and forward "power" flush on it with a garden hose.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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