Are the heater hose's going through the fire wall hot ?
I2 CHECK FOR HOT WATER TO THE HEATER CORE INLET HOSE
WARNING: The heater core inlet hose will become too hot to handle and may cause serious burns if the system is working correctly.
Allow the engine to reach normal operating temperature.
Feel the heater core inlet hose.
Yes GO to I4 .
No REFER to Section 303-03 to check cooling system function.
SOURCE: location of heater control valve 2005 grand prix
i don`t think there is a heater control valve.you may have an air pocket in system.
SOURCE: 2002 mitsubishi heater not working
approx. $200-250 - takes less than an hour to replace if that part is the problem
SOURCE: 2005 highlander heater problem
I'm glad I could help. I'm reposting the solution below in case anyone needs it in the future. Please be sure to rate it for me!
Pull the temperature knob off and verify the thin 12mm nut is installed
and tight behind it. I have seen several of these loosen up allowing
the knob to turn but intermittently have no effect on temperature.
SOURCE: would the heater control valve malfunctioning make
04 chev epica suddenly only blows cold air coolant level good fan works good and will change from heat defrost and floor properly just only blows cold
SOURCE: AC/Heater control valve :Lancer 2003 Misubishi
The sliding switch on the console is stuck in the cold position and the knob is pulled off. Use pliers to jiggle the switch as best you can. Feel under the center console and you probably will find the cable that is hooked up to the flapper. You'll know because when you jiggle the cold/heater switch at the upper console, the cable will move slightly. At the hookup of the cable to the flapper down under the console (passenger side) try to work the flapper loose to the open (or close) position. At the same time work the sliding switch (with pliers). The flapper will come loose and function properly. Try not to knock of the AC button like I did in the process. It flew off some where under the passenger seat. I'll find it sometime before summer. Ha.
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