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Your theory is valid, but check..
Posted by AlS (more from AlS) on Mon, 23 Jun 2008 17:41:10
In Reply to: coolant bypass valve failure modes, brick8, Mon, 23 Jun 2008 14:33:15
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Hold your hand (or better, a thermometer) over dash vent when on max cool setting. Is the air cool, (mine is 39-41 deg. in two-three min)? Change the direction setting manually to the floor vent and make sure it changes. If the max cooling can not be achieved then the diagnostic tree branches several times, including the water valve.
The easiest way to check the valve I can think of is to use an IR thermometer to check to heater hose temps. With engine running at norm temp, check the temp of the hoses going into the firewall. If the valve is working, the temp should diminish when you turn on the AC.
Otherwise you get get your hands dirty by looping the heater hose directly back to engine (the no heater state) and take it foe a test drive.
posted by 76.94.11...
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