Question about 1990 Jeep Cherokee Limited

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Overheating on a 1990 jeep lardeo new waterpump

Overheating on a 1990 jeep lardeo new waterpump therostat and hoses

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  • kyhiem30 May 11, 2010




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Had the same problem. After new water pump, radiator, thermostat and lot of frustration it turned out to be the cap and the resovour bottle. Found out Jeep recalled original bottle because the plastic would get hot and then soften up which would break pressurized seal at the cap. Replace bottle and cap or try a good compression clamp around cap,(cheap fix,but hassel when adding anti-freeze).

Posted on Mar 03, 2010

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Assuming you dont have a blown head gasket the most likely thing is a clogged radiator. Lee

Posted on Sep 29, 2009


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Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.

The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.

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"if this has helped you in any way, please rate this solution"

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You might wann replace the coolant, and also check the radiator fans, if they are working or not.

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Is there any chance the thermostat got installed upside down? Flat end down into the engine is right. How hot does it get? Did you turn the heater on to circulate through it and get the air out of the heater core?
Thermostat usually open at 190 degrees, you may need a "candy thermometer" to double check the water temp in the rad. Get it in housewares. It's possible the thermostat is defective, I've seen that before. Hope this helps.

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Does the gauge just show hot or is it loosing coolant? Could just be a bad gauge or a plugged radiator.

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there are three hoses leading to the water pump. the biggest one oviously goes to the thermostat housing, but the other two are much smaller 1 inch hoses, one of wich goes on the water pump and the other on the thermostat housing. if you follow the hoses one will connect to the upper part of the overflow for the radiator after hitting a T in the lines, that hose connects to the thermostat housing, and the other goes to the water pump its self.

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