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#26 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,470
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Re: Heater
The alternator raises the system voltage. Higher voltage results in more current to the blower. Your 10A fuse must be right on the edge of working on 12.5V battery voltage, and the slight increase in current when you've started the engine is enough to push it over the edge at 14.5V.
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#27 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,691
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Re: Heater
If I had a non-A/C truck and all I could find is A/C blower motors (I think that is the case) I would add another resistor in series with the motor to reduce its speed and make its top speed similar to a heater blower motor. This would help preserve the fan speed switch and wiring. Until that is done, run it on low or medium only. The additional resistor should be located inside the heater box so it gets cooled off by air flow, because it's going to get red-hot.
If you happen to have the original heater blower motor, I suggest take it apart and see about replacing the bearings and get it going again. I have replaced bearings on small blower motors on a B-52 and it worked out fine. Perhaps that same thing can be done on a Chevy. |
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#28 | |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,106
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Re: Heater
Quote:
http://67-72chevytrucks.com/vboard/s...698377&page=35 I will point out many folks have simply found that replacing the 10 amp fuse with a larger fuse has worked for them after installing an AC blower.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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