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Most common would be your blower motor voltage regulator, this is the part that varies the voltage to the blower motor telling it to go faster or slower. It is located up under the dash on the passengers side and pretty easy to replace. You might also have to replace the blower motor and cover though, if the regulator has never been replaced before you might have to do this. The old style regulator is not available anymore.
What else can I help you with?
Why is the heater in your 1997 jeep wrangler blowing cold air?
it could be a couple of things you could have a bad thermostat or a bad heater core
Jeep Wrangler has no heat?
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
Why is 1997 Buick Park avenue heater blows hot air on driver's side while blowing cold air on passenger side?
Check the following items............... 1. A/C heater controller. 2. A/C heater controller doors.
Why is your heater blowing out warm air in your 1990 buick regal?
Isn't a heater supposed to blow warm air?
Heater on but not blowing warm air?
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
How do you fix the heater in Mercury Sable - Ford Taurus?
No one knows if:The heater is NOT blowing - or blowing on high speed only, or... The heater IS blowing, but the air is NOT hotEither way, the "Related Questions" below will get you started
Why would a 2000 Saturn heater only blowing warm air?
it is a heater. heat. it blows heat. warm air
Why is my heater on but blowing cold air?
Your heater may be blowing cold air because there could be a problem with the thermostat, a lack of fuel or a clogged air filter. It is recommended to check these components and consult a professional if needed.
Should the air conditioner unit come on when the heater is blowing?
If your heater is a heat pump , then yes.
Heater blowing cold but car not overheating?
faulty control valve on heater or air in the lines
Why is your car heater blowing out cold air when it is on?
Low coolant and a clogged heater core are possibilities.
Why your heater is blowing cold air?
Maybe its broken. Or maybe you pressed the AIR CONDITIONING
