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02-03-2009, 06:36 PM
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#1 |
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Registered User
Join Date: Jan 2004
Location: Northwestern Ontario Canada
Posts: 359
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91 silverado no air volume on defrost
I have a 91 Silverado which i just changed the heater motor in. There is not much air volume coming out of the defrost vents. Heater motor is blowing strong and the air volume is very week. Checked the control door actuator and it is moving freely and has good travel. Any ideas? Thanks
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1986 Silverado Short box fleet side. project 2005 VW Tiguan 4 Motion 1997 Blazer S10 4x4 1990 Chevy Silverado K1500 Extended long box |
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02-07-2009, 10:08 PM
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#2 |
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Registered User
Join Date: Oct 2006
Location: iowa
Posts: 722
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Re: 91 silverado no air volume on defrost
is there a hole anywhere in the heater box...recently replaced the heater core in my '94 and broke the access cover....it had a hole about the size of a silver dollar in it and that made a HUGE difference in the air flow of the heater. you could also check to make sure that you don't have a bunch of leaves, snow, or ice on the cowl vent because that is where the air intake for heater is localed...
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"Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles  '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L
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