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NEED Help --Overheating


 
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firemanDan
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Joined: 17 Feb 2006
Location: PA

PostPosted: Fri Feb 17, 2006 3:44 pm    Post subject: NEED Help --Overheating Reply with quote

I have a 1989 Cherokee. It started overheating. I replaced the thermostat.
It continues to overheat and has no heat.
It seems like there is some type of air lock.
I tried filling it at the highest point (overflow hose) but no luck.
Does anyone have any idea what could be the problem ?
I am getting frustrated. Thank you.
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JeepinNH
Member


Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Fri Feb 17, 2006 4:17 pm    Post subject: overheating Reply with quote

Your Jeep most likely has the closed system. This type gets air pockets in there which are tough to get out. If you do a search on this site you can find ways to remove the air. There is also a writeup on making it an open system in the Tech Writeups.
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Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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catheadred
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Joined: 17 Feb 2006
Location: claxton,gerogia

PostPosted: Fri Feb 17, 2006 5:17 pm    Post subject: Reply with quote

the fact that it overheats and the heater doesnt work would lead me to beleive that you have a problem with rust in your cooling system. your heater core is probably stopped up and your radiator not far behind.this is even worse on the closed cooling systems.if you replaced the thermostat you would know if you have a rust problem
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firemanDan
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Joined: 17 Feb 2006
Location: PA

PostPosted: Fri Feb 17, 2006 5:38 pm    Post subject: Reply with quote

Thanks for the replies. The system seemed clean, when I replaced the thermostat..no rust at all.
I think it is an airlock. I know Hondas have an air bleeder at the highest point in the cooling system. I was hoping there might be something like that. It is a closed system.
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ThePhantum
Pissed-Off Admin
Pissed-Off Admin


Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Fri Feb 17, 2006 9:50 pm    Post subject: Reply with quote

Anytime you work on a closed cooling system, you need to purge it of air. Although this writeup is for the 2.2 and 2.5 engines, the same basic proceedures apply.

Good Luck.
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