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06-21-2007, 06:26 PM
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#1 |
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Registered User
Join Date: Aug 2002
Location: Farmers Branch, Tx
Posts: 1,009
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heater blower speeds
I just bought a 69 and have a question about the fan. It works ok on low and medium speeds but slows down when put on high. This is a factory a/c truck and i am trying to get some bugs out of it so I can stay cool this summer. Help me!
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http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club |
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06-21-2007, 08:11 PM
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#2 |
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Registered User
 
Join Date: Jun 2007
Location: lemoore ca
Posts: 126
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Re: heater blower speeds
I just had the same problem! My hi fan wouldnt even run, believe it or not it was a bad posative battery wire. I replaced the posative wire and the smaller gauge wire that hooks in up close to the battery and everything works great now, crazy thing is the only thing I noticed the whole time was the hi speed fan not working.
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06-21-2007, 09:24 PM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: heater blower speeds
more likely, it is the hi speed relay under the dash towards the glove box.
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06-21-2007, 10:12 PM
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#4 | ||
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Registered User
Join Date: Aug 2002
Location: Farmers Branch, Tx
Posts: 1,009
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Re: heater blower speeds
Quote:
Quote:
__________________
http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club |
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06-21-2007, 10:15 PM
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#5 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: heater blower speeds
someone will have a pic... it looks a lot like the horn relay by the fuse box, silver metal deal with a plug on the bottom. it should be under the dash by the glove box.
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06-21-2007, 10:25 PM
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#6 |
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Registered User
Join Date: Oct 2006
Location: Elgin, IL
Posts: 658
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Re: heater blower speeds
My fan was horrible, it would barely turn on even iff u kicked it all the way to high speed. The problem with mine was the bearing for the motor shaft was horribly worn, so i needed a new fan, but urs sounds much less severe. If u cant find the problem, possibly the relay like stated above, i would maybe take out the fan and check.....of course its really not too fun to remove, so i would try anything and everything else first...
Brad
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2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______|_|__\____ ..-..~.|_(O)__|_|__|_(O)] |
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06-21-2007, 10:29 PM
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#7 |
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Senior Member
Join Date: Nov 2005
Location: northwestern wi
Posts: 2,111
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Re: heater blower speeds
it is in the farthest to the right side of the under dash hvac box directly below the right side of the glove box held on by 2 5/16 head screws
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common sense isn't so common anymore |
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06-21-2007, 10:33 PM
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#8 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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Re: heater blower speeds
please let me know if you get this fixed, have the same problem when i put it on high seems like it goes back to low. Have an ac truck too.
chico
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1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold 
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06-21-2007, 11:06 PM
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#9 |
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Registered User
Join Date: Aug 2002
Location: Farmers Branch, Tx
Posts: 1,009
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Re: heater blower speeds
Thanks all. I saw that relay yesterday. It looked just like a horn relay. Is there an easy way to test it or should I just buy a new one?
__________________
http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club |
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06-22-2007, 03:20 AM
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#10 |
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Senior Member
Join Date: Dec 2002
Location: Portland, Oregon
Posts: 901
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Re: heater blower speeds
The relay case needs to be grounded..... remove relay, remove rust. corrosion and remount with some star washers that will bite into the relay as it is replaced on the firewall, Also check wire connections to the relay
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). Last edited by GMC Jim; 06-22-2007 at 03:22 AM. |
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