Question about 1998 Chevrolet Tahoe

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WATER VALVE WON'T CLOSE FOR A/C TO WORK . HEATER & A/C WORK AT THE SAMR TIME .1999 TAHOE

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  • db1954252 Nov 14, 2009

    THE TAHOE HAS A INLINE WATER VALVE THAT WORKS FROM VACUUM LINE THAT IS UNDER THE HOOD BUT THERE IS A ELECTRIC VALVE THAT OPERATES THE WATER VALVE THAT IS NOT WORKINF THE VALVE . I REPLACED THE ELECTRIC VALVE 11/12/09 BUT IT MUST NOT BE GETTING POWER TO CLOSE VALVE . I HAVE ALSO CHANGED THE CLIMATE CONTROL IN THE DASH . WHAT ELSE IS THERE TO TRY .

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Common problems to all vehicle, the heater valve tend to seized up over time exposed to heat and not closing or open correctly. the internal part of the valve made out of hard rubber and tend to get seized up over time if heat is not use often. you will have to get behind the dash which mean tearing the dash apart to get to it. the part is very cheap and easy to replace the task is getting to it.

Posted on Nov 14, 2009

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OK, most cars have heater cores that get hot but the blender door directs air away from this core in the a/c mode when you want cool air from the evaporator.

I'm not sure if there is a control valve which stops the water from going through the heater valve.

I think the part is called a 'heater blend door actuator' that you are after.
http://www.autoanything.com/air-conditioning-65-861/201A1060.aspx?kc=AFFCJ&mr:referralID=c9ca506d-9f22-11df-bf8d-0026b95a1738


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check the valve if it is stuck close. feel the hose if it is getting warm as water passes thru.

tnx 4 using fixya,

drcool

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