ac fan switch only works on 4

wickedss · 11-22-2005, 11:55 AM

Hey guys,
I just bought a 98 blazer and the fan switch for the ac only works on 4. Any ideas on how to fix it?

Thanks,
WickedSS

Watrboy821 · 11-22-2005, 04:14 PM

Ha my 96 did that, there are 3 relays under the hood right up next to the blower motor. Replace the one all the way to the left and it should work. If it doesnt then try the others. The relay was like 23 bucks or something at advance auto. If you ask them for it, its just called an a/c relay.

200k1993Blazer · 11-22-2005, 11:14 PM

Not sure if your year Blazer has one, but most GM's (old and new) use a blower resistor for all fan speeds but High, and High uses a relay because of the higher current required. I have had this problem on several GM cars, and the resistor was always the culprit. Call the dealer and they could tell you. Hope this helps.

Upsetta666 · 11-22-2005, 11:16 PM

Quote: Originally Posted by 200k1993Blazer

Not sure if your year Blazer has one, but most GM's (old and new) use a blower resistor for all fan speeds but High, and High uses a relay because of the higher current required. I have had this problem on several GM cars, and the resistor was always the culprit. Call the dealer and they could tell you. Hope this helps.

Exactly what he said, blower motor resistor...

11-22-2005, 11:55 AM	#1
wickedss Registered User Age: 36 Join Date: Nov 2005 Posts: 1 Location: User is: OffLine	ac fan switch only works on 4 Hey guys, I just bought a 98 blazer and the fan switch for the ac only works on 4. Any ideas on how to fix it? Thanks, WickedSS
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11-22-2005, 04:14 PM	#2
Watrboy821 God I hate you guys Age: 22 Join Date: Apr 2005 Posts: 170 Location: South Jersey User is: OffLine	Re: ac fan switch only works on 4 Ha my 96 did that, there are 3 relays under the hood right up next to the blower motor. Replace the one all the way to the left and it should work. If it doesnt then try the others. The relay was like 23 bucks or something at advance auto. If you ask them for it, its just called an a/c relay.
	[Reply w/Quote]

11-22-2005, 11:14 PM	#3
200k1993Blazer Registered User Age: 29 Join Date: Nov 2005 Posts: 5 Location: User is: OffLine	Re: ac fan switch only works on 4 Not sure if your year Blazer has one, but most GM's (old and new) use a blower resistor for all fan speeds but High, and High uses a relay because of the higher current required. I have had this problem on several GM cars, and the resistor was always the culprit. Call the dealer and they could tell you. Hope this helps.
	[Reply w/Quote]

11-22-2005, 11:16 PM	#4
Upsetta666 Registered User Age: 32 Join Date: Aug 2005 Posts: 181 Location: Vero Beach, Fl. User is: OffLine	Re: ac fan switch only works on 4 Quote: Originally Posted by 200k1993Blazer Not sure if your year Blazer has one, but most GM's (old and new) use a blower resistor for all fan speeds but High, and High uses a relay because of the higher current required. I have had this problem on several GM cars, and the resistor was always the culprit. Call the dealer and they could tell you. Hope this helps. Exactly what he said, blower motor resistor...
	[Reply w/Quote]