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Unread 07-23-2014, 10:00 PM   #1
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cooling problem

I need a little help!!! my 1993 grand Cherokee straight 6 heats up after about 1 hr of driving but only stop and go traffic, when driving above 30mph its fine keeping below 180 degrees. flushed system replaced all anti freeze and even changed thermostat with oem 195degree. driving around town normal traffic no problems only stop and go after awhile driving. any suggestions radiator, weak water pump, belt bad thermo also have make shift cap on recovery tank help!!!!!!!

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Unread 07-23-2014, 10:44 PM   #2
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Bad fan clutch.
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Unread 07-24-2014, 05:08 AM   #3
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Unread 07-24-2014, 06:28 AM   #4
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How hot is it getting?? If your thermostat is a 195, you should expect it to run around there. Fan clutch is always a possibility.
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Unread 07-24-2014, 11:34 AM   #5
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Not sure what kind of make-shift cap you made for the coolant reservoir/tank but it should not be taped on air-tight and the OE cap isn't air-tight either! Make a mark on the tank at coolant level after it's been sitting overnight then check to see if the coolant level has risen once hot. As the engine sits overnight, and the coolant cools down, a vacuum is created in the cooling system which draws coolant in from the reservoir. Then once it heats up to normal operating temps the coolant expands which gives you a higher tank level. If the coolant level is not changing then check to make sure the make-shift cap isn't on too tight and rubber hose between tank/rad filler neck isn't clogged. If the level hardly changes, and if the reservoir cap isn't air tight, while your hose is open/not clogged, then your rad cap could also be faulty in not opening up to let the coolant pass.

But if the coolant level is moving up/down good depending on cool/hot then I'd also suspect the fan clutch as others mentioned. With a 195 degree thermostat I've always used my normal operating temp is right around 210, or a hair under, which is normal spec. Good luck!
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Unread 07-24-2014, 12:51 PM   #6
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Stock cap is 18 or 19lbs? I forget. It's one of those.
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Unread 07-24-2014, 02:13 PM   #7
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Originally Posted by polkapower
stock cap is 18 or 19lbs? I forget. It's one of those.
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Unread 07-24-2014, 02:31 PM   #8
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Sounds like fan clutch to me too. May be a good time to remove the fan/shroud and switch over to electric for about $80. My Jeep was getting hot in 90-100 degree weather with the AC on but after doing the Taurus fan and Supercooler she stays just shy of 210 no matter how hot it is outside or how long I'm sitting. That's without using the high speed, just low speed with a typical 40 amp relay.

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