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Old 07-15-2005, 10:10 AM   #1 (permalink)
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Question Cherokee Overheating Help appreciated

K, so here are my wifes ZJ Symptoms. It's overheating but only when the A/C is on. When you turn the a/c on the jeep immediately lowers it's idle to about 600-650 RPM's and the jeep runs really rough. I just did an oil change, changed the air filter,spark plugs, cap n rotor and the coil, The tranny fluid /filter and replaced the uppr radiator hose that sprung a geiser the other day. Could it possibly be timing or some other part I missed. I haven't replaced the 02 sensor yet but I am going to do that tomorrow.
It's a 93 Grand Cherokee
242 4.0 Six
Auto Tranny and power everything.

thx in advance
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Old 07-15-2005, 10:13 AM   #2 (permalink)
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check thermostat?
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Old 07-15-2005, 10:15 AM   #3 (permalink)
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thx, Didn't think of that. any Ideas about the Idle as well?

P.S. Love the SQL
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Old 07-16-2005, 06:11 PM   #4 (permalink)
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Well I know nothing about Jeeps. But when you turn the A/C on you're working your engine harder so the idle may drop slightly. But I'd think they'd have something that would compensate for that. Just my theory...
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Old 07-17-2005, 06:38 AM   #5 (permalink)
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Does it have the second electric fan in addition to the belt driven fan? I have just had to put a new electric fan in a friends Cherocar with AC. The fan was smoked and it had also blown the fuse. The fan comes on with the AC or at a certian engine temp.
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Old 07-17-2005, 06:03 PM   #6 (permalink)
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it sounds like the second fan is not coming on.
check for power at the fan plug. If you don't have any power at the plug on the fan then you may just need a relay.
if you do then time to hit the junk yard for another one.
there is a little vaccum thingy on the firewall that is supposed to raise the idle when the ac is on, but they are not adjustable. (at least mine was'nt)
you may need a new one of those to get the idle up. they create a small vaccum leak which raises the idle.
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