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Old 09-18-2006, 09:56 AM
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engine overheating

my son has a 1989 jeep cherokee laredo. we have replaced radiator, waterpump, and thermostat. she still is getting hot, dont think electric fan is kicking on . how can we know for sure?

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Old 09-18-2006, 10:01 AM
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Have you tried letting it idle and watching the fan?
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Old 09-18-2006, 10:15 AM
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First, if it has air conditioning, turn it on, it should make the cooling fan come on. If it does you know the fan itself works, then let it idle and see if the fan comes on. Coolant temp needs to be at 190* or higher to activate the cooling fan. Also look at the cooling fan relay (left hand side of engine compartment) if these steps do not make the coolant fan work.

Steve
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Old 09-19-2006, 10:20 PM
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Check for blown head gasket

I had an engine one time that had everything in the cooling system working properly and the engine still overheated. I found out later the engine had a blown head gasket. To check for this ON COLD ENGINE take the radiator cap off, fill radiator as full as it will go, start the engine, watch for bubbles in the radiator with a flashlight, when the engine reaches operating temperature. If you get bubbles you either have a blown head gasket, or cracked block or head, and you will have cooling problems.
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Old 09-21-2006, 09:46 AM
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Hi! This Is Tweety; I Want To Thank Everyone For Their Input To Our Jeep Problem! We Found Out That The Pressure Cap Wasnt Holding The Pressure! Replaced It, And Now It's Doing Great!
Once Again Many Thanks! Tweety
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