Hi, My 2004 saab 9.5 ac unit is working fine with the auto climate control. Unfortunately, when i put the temperature up to use the heat it is blowing cold air. Do you know what the problem might be?
Probly a switch or module is bad------maybe heater core too-----have it inspected by a specialist or radiator guy--not a dealer
SOURCE: Impala has dual climate control. AC blows cold on
with a dual climate control system, it is imperative for a proper refrigerant charge to be maintained. the symptom you describe is a possible indicator of low charge on the system. the ac evaporator core is closest to the right side of vehicle thereby making air feel cooler on that side, on the left side of the vehicle the cooled air has farther to travel and warms up from cabin air before it discharged from the vents. this is the most probable issue for your vehicle...however if the charge is accurate, the issue would be more so in the air temperature doors which is located deep inside the dash...i hope this helps...good luck!
SOURCE: E46 Climate control blows hot air regardless of temp setting
your water controll valve located at the right side of the engine near the extreme rear end of the inlet manifold may not be working properly hence the hot air .
SOURCE: AC Problem
Sounds like the blend door is stuck. Unfortunately the blend door is buried deep within the dash.
SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side.
You have dual zones that are controlled by temperature actuators the passenger side has lost its memory or has gone bad you can put it in self programming by disconnecting the battery for ten minutes then hook it back up start the truck turn the temperature control on but do not touch any other controls let it go thru the self programming for about 6 to 7 minutes then select your temperature you want if it still does not work properly you may have a bad actuator or a bad connection at the actuator
SOURCE: 02 Jaguar S Type - Heater blowing cold air
Has the vehicle overheated recently, if not there is a failure of the Coolant from engine valve controller, that measures flow through the Heater Matrix. Come back with more, as necessary.
Regards,DT
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