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Re: blowing hot when driving, cold at idle? anyone?
Sounds like there is a vacuum leak, typically in the diaphragm that controls your blender door. You'll probably have to trace the vacuum tubing that goes from the temperature and mode controls on your dash to the diaphragm's location. A hand-operated vacuum pump helps this diagnosis alot by selecting a nozzle that you can push into each hole in the connector and draw a vacuum. Good vacuum lines will maintain vacuum after stopping pumping.
Of course, if you have electrical mode control and a cable-operated temp control valve (located in the heater hose tubing near the firewall), I might suggest a partially blocked heater core or hose.
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Current Garage:
2009 Honda CR-V EX
2006 Mazda 3i
2004 Chevrolet Silverado 2500HD
2003 GMC Envoy XL
2000 Honda ST1100
2000 Pontiac Sunfire
Vehicle History:
2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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