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Joined: Feb 2012
Posts: 209
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Feb 2012
Posts: 209 |
Had my A/C converted over to R 134A and for whatever reason the selector switch for the fan only runs on high. I cannot regulate the fan speed. But the switch works in the heat mode for fan speed. Anyone have any ideas what to troubleshoot for? Thanks again.
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Check with the people who installed the AC. It may be set up that way on purpose.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Dec 2001
Posts: 399 Likes: 1
Backyard Mechanic
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Backyard Mechanic
Joined: Dec 2001
Posts: 399 Likes: 1 |
Rich, Ray is right, go back to the installer. The parts might have some compatibility issues with the circuit board or wiring. See what parts they used.
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Joined: Jan 2008
Posts: 828 Likes: 6
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 828 Likes: 6 |
Converting a system from r-12 to r-134 should not have anything to do with fan speeds. I would check the wiring to the blower resistor, maybe it got unplugged or moved enough to cause a poor connection.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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Joined: Jun 2007
Posts: 1,894
ChatMaster - 1,500
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ChatMaster - 1,500
Joined: Jun 2007
Posts: 1,894 |
If it worked correctly before it was converted then check with installer.
If this just happened out of the blue it would be a good idea to have a look at a wiring diagram for your car.
Usually the high speed bypasses the resistor board and has it's own circuit so a schematic would be nice to see where it goes. Sometime the resistor board for lower speeds fails but high will still work.
GM's in the 70's also seem to melt connectors if the blower motor was tired so pull apart any related connectors and have a look for any deformation.
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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