Question about 1998 Jeep Cherokee

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1998 jeep cherokeesport

No heat, replaced thermostat,waterpump, heatercore seems ok

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  • sfsl1 Dec 11, 2008

    Would this solution also apply for a 1990 Jeep Cherokee Laredo with no heat?

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Follow these steps:

Check coolant level, then start engine until it is warm and the thermostat opens. You will tell when it does when the needle on your temp gauge goes cold when it reaches around 180-200* and then goes back up. Now turn on your heater full blast and go to the engine compartment. You will see a heater valve located on the passenger side, next to the washer reservoir. It is a black thing with 4 heater hoses connected to it. Feel the hoses. When everything is working correctly it should be like this:

Hose going to waterpump will be hot
Hose going to (I think the thermostat housing) will be hot
2 Hoses going to heater core (mounted behind firewall) will be hot

1. If only 1 heater core hose is hot, heater core is clogged--
UNCLOG: remove 2 hoses going to heater core when engine is cool, hook water hose end to one of the sides and flush out gunk from heater core. Reconnect hose and you should be good.

2. If neither hose core hose is hot, heater control valve is bad or vacuum is bad--
Test Vacuum: remove vacuum line from heater control valve, you should feel the vacuum **** on it when pressed to your cheek and the heater control valve actuator should move when you unhook the vacuum line. If you have a good vacuum, it's probable the valve available at autozone part # 5941 for around $21.

To get heat while you wait to replace part, unhook silver arm on heater control valve that is hooked to the plunger. This will give you heat all of the time, but it is controlled by the bottom hot/cold switch on your heater control unit so you won't get hot in the cab. It will just circulate heat through the core.




Posted on Oct 27, 2008

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How's your AC? that vehicle has problems with the blend door and blend door actuator in the dash. It sits under the pass side dash just behind the center console. move your temp selector back and forth from hot to cold and you should feel the motor moving by putting your hand on it. I believe they also had problems with the actual door inside breaking.If you can feel the motor moving that's probably the case and i think you need to replace the heater box to alleviate that issue
good luck!

ry

Posted on Nov 30, 2008

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Posted on Jan 02, 2017

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