Question about 1999 Jeep Cherokee

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Luke warm heat

Blew head gasket 2 months ago.Didn't need heat until now,but when you turn on the heat it just blows out luke warm.pulled off radiator cap inside was full of junk.Took it in for a flush and they told me the heater core was plugged.Wanting to find out for myself I pulled the lines off and tried to put water thru the core and it just trickeld out.So I bought some flush ran it thru and hooked up the hose again and got great flow but still no heat.When the garage did the heat gasket could they mistakenly have done something about the heat .Is there some type of heater control valve vacume line thingy(haha)???So what ya think??Jim

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YES, THEIR IS A HOT WATER CONTROL VALVE, ITCAN BE OPERATED BY VACUMN, OR CABLE, VAC, TYPE WILL HAVE AVACUMN HOSE TO IT, PLS CHECK IT FOR CONDITION, CRACKS, SWELLING, IF OK, THEN WITH ENGINE RUNNING, HEATER CONTROL IN HOT POS. PULL HOSE OFF VALVE, PUT FINGER OVER END, FEEL FOR VACUME. IF THERE IS, MOST COMONLEY RESULT IS THAT VALVE NEED TO BE REPLACED.

Posted on Oct 05, 2008

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