Heating Problems after bypassing heater control valve

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07-01-2012, 03:36 PM

Siv

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Model: Cherokee

Heating Problems after bypassing heater control valve

Hello I was hoping I could get some help with this. I have a 1989 Jeep Cherokee Limited with about 230K on it. The heater control valve wore out and I decided just to bypass it. But the overheating continued and the needle goes completely to the max. It does have a new radiator and I had put in a new thermostat just a month ago. If I fill it up completely with water it does stay at around 220 but as soon as I turn it off, the water and coolant as expected just boils over and vents out.

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07-01-2012, 03:39 PM

RTorrez1

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Year: 1998 Sport

Model: Cherokee

Engine: 4.0

When was the last time that your cooling system serviced other then just replacing the t-stat?

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07-01-2012, 03:42 PM

djb383

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Year: 1998

Model: Cherokee

Engine: 4.0L HO

U might also need a new bottle and cap, a new fan clutch and water pump. The correct amount of coolant/water ratio and a good seal at the cap/bottle should give u boil-over protection to +/-260.

Last edited by djb383; 07-01-2012 at 03:44 PM.