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'01 Sunfire - HVAC only blows on high
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joelkirk
New User
Feb 7, 2009, 1:03 PM
Post #1 of 5
(1457 views)
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'01 Sunfire - HVAC only blows on high
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2001
Pontiac
Sunfire
2.2L 4-cyl.
99,500 miles
Hi folks. Seems like a great forum.
I'm having an issue with my Sunfire. The HVAC system works fine, except for one small problem. The system will only blow air on high and med-high settings only. There's 4 blower speeds on the dial, but when you select low or med-low, you get nothing, nada, zip. Speeds three and four work great.
I checked all the fuses, not expecting to find a problem but as a starting point, and they're fine. I know there's a couple of relays under the hood by the 50 amp fuses marked "HVAC", but I don't know how to test and see if that's a problem. Or maybe I'm looking at it the wrong way. Any help or direction you can give would be appreciated. Thanks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 7, 2009, 2:02 PM
Post #2 of 5
(1454 views)
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Re: '01 Sunfire - HVAC only blows on high
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Hi,
Don't make me promise but this is usually a "blower motor resistor" failure. Many will fail to just HIGH so I'm doubting it completely for now. I think they can fail in sequence like that and soon you may have just High.
Most are located on top of the distribution box (heater/ac box/ductwork) close to the blower motor. Some from inside might be reachable thru a removed glovebox - not certain on this exact car.
Pretty much the only other choice is the switch itself but I don't see that as so common,
T
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joelkirk
New User
Feb 9, 2009, 6:59 AM
Post #3 of 5
(1437 views)
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Re: '01 Sunfire - HVAC only blows on high
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Thanks for your input Tom, I was hoping it would be an easier fix so I will probably take it to a local shop soon. Thanks again!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 9, 2009, 7:14 AM
Post #4 of 5
(1434 views)
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Re: '01 Sunfire - HVAC only blows on high
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As it goes that IS AN EASY FIX!
Good luck,
T
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cpaine0106
User
Feb 14, 2009, 7:44 PM
Post #5 of 5
(1411 views)
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Re: '01 Sunfire - HVAC only blows on high
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Just to confirm Mr. Greenleaf's theory; I've seen many GM resistors fail on only one or two settings. Not so sure about other manufacturer's though. If you haven't taken it to a shop yet, it's a fairly easy fix with a quarter inch socket set a small light and a bit of patience. A 7/32 open end wrench may also be required for one of the small screws holding the resistor in.
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