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01-30-2003, 02:42 AM
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#1 |
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Registered User
Join Date: Jul 2002
Location: Ventura, Ca.
Posts: 87
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Defrost/Heater Help
Sometimes when I set the defrost controls, the air comes out as if I had the heater on. I'll try to move the controls back and fourth to see if I can jar something loose as if something was stuck, but I don't have any luck. Maybe something's stuck? I'll then stop and let it be and come out the next day to go to work and I'll set the defrost and it will work! What gives here? I haven't begun to try and correct this. I'm thinking a valve is stuck in the unit. Where do I start to try and fix this?
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Aaron Ventura, Ca. 1972 GMC Super Custom SB350/TH400 |
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01-30-2003, 06:37 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Do you have AC?
Jim |
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01-30-2003, 10:23 AM
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#3 |
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Registered User
Join Date: Jul 2002
Location: Ventura, Ca.
Posts: 87
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Yup
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Aaron Ventura, Ca. 1972 GMC Super Custom SB350/TH400 |
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01-30-2003, 11:00 AM
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#4 |
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Registered User
Join Date: Nov 2001
Location: Indianapolis, IN USA
Posts: 157
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sounds like you may have same problem as this post
http://67-72chevytrucks.com/vboard/s...threadid=38311 but your door is jamming there may still be time to fix it!! |
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01-30-2003, 02:04 PM
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#5 |
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Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Sounds like the flap in the diverter box is broke.
You can repair or replace. GMC Pauls has em GMC Pauls
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
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01-30-2003, 04:43 PM
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#6 |
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Registered User
Join Date: Jul 2002
Location: Ventura, Ca.
Posts: 87
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Can I get just the diverter flap or do I have to get the whole box. Thanks for the help guys.
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Aaron Ventura, Ca. 1972 GMC Super Custom SB350/TH400 |
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01-30-2003, 05:38 PM
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#7 |
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Registered User
Join Date: Nov 2001
Location: Indianapolis, IN USA
Posts: 157
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will have to get whole box......don't think anyone sells just the flap since the rod that runs trough it is in the mold...sure there is a way to fabricate one your self tho.....i have seen some made of sheetmetel. You would take the old one out after cleaning the old one off the rod then spot weld the new metal one in. Sure there are many ways to do this if you have time and resources.
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01-30-2003, 08:08 PM
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#8 |
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Senior Member
 
Join Date: Dec 2002
Location: Portland, Oregon
Posts: 901
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Fixed my flap with some fiberglass fabric and epoxy resin... very strong and works great.....( you can get the expoxy resin from boat dealers....Jim
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
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01-31-2003, 03:08 AM
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#9 |
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Registered User
Join Date: Jul 2002
Location: Ventura, Ca.
Posts: 87
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Thanks for the input. Where do I begin? I haven't begun to look at the breakdown as far as finding a starting point. I hope it's easier than it looks.
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Aaron Ventura, Ca. 1972 GMC Super Custom SB350/TH400 |
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01-31-2003, 05:05 AM
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#10 |
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My other Love
Join Date: Aug 2001
Location: Castlegar B.C. Canada
Posts: 4,085
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Something could be broken, or maybe a whole bunch of crap fell into your heater box blocking the flapper
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 Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life |
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