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heater control

Old 11-22-2010, 08:16 PM
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Question heater control

So I have a 1991 Jeep Cherokee Larado and my heater is giving me some problems. It does not put out heat when it warms up only after I get going and then sometimes when it's on it will start blowing cold air and then switch back to hot. Along with this problem my heat temp gage is almost always maxed out or saying I am running at 210 degrees. Other than the heat everything else runs great and it drives fine. Any suggestions as to what might be wrong?
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Old 11-22-2010, 08:20 PM
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check this heater control valve for operation when you have the heat selected it by the pressure bottle
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Old 11-22-2010, 08:22 PM
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look like thic check for vacuum in small line whn running
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Old 11-22-2010, 08:23 PM
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when heat stops see if tis coming out of defrost vent
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Old 11-22-2010, 08:24 PM
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Originally Posted by freegdr View Post
check this heater control valve for operation when you have the heat selected it by the pressure bottle

thank you very much I'll try that
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Old 11-22-2010, 08:26 PM
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Originally Posted by thouse View Post
thank you very much I'll try that

i tried that it was all cold air
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Old 11-22-2010, 08:29 PM
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check the vacuum ball for hole and check the lines for cracks and loose connection, you dont have to take the bumper off look in pass fender well
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Old 11-22-2010, 08:36 PM
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Originally Posted by freegdr View Post
check the vacuum ball for hole and check the lines for cracks and loose connection, you dont have to take the bumper off look in pass fender well

I'll try that to thanks
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Old 11-22-2010, 08:41 PM
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Have you done a complete cooling/heating system flush?
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Old 11-22-2010, 08:47 PM
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Originally Posted by corbinxj View Post
Have you done a complete cooling/heating system flush?

Last year my bottom radiator hose broke do to ice in the hose it was flushed then
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Old 12-21-2010, 01:55 PM
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I have the same problem. It blows cold until I get going or rev the engine. I have changed the waterpump,thermostat,flushed the system,flushed the heater core,new radiator cap,and I removed the bypass valve and now I'm scratchin my head.
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