93 Roadmaster auto climate control - Chevy Impala SS Forum
 
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post #1 of 3 (permalink) Old 11-21-2016, 12:08 PM Thread Starter
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93 Roadmaster auto climate control

The blower motor isn't working. The fan works (adding remote power), the relay checks out, the resistor block seems to be okay, and what appears to be the problem is no signal coming from the automatic climate control for the fan speeds. Only gets 0.5V at the blower motor connection.

I know these climate control modules have a self-diagnostic capability. Anyone know how to look into this to see if the blower motor circuit is working properly?

'93 Roadmaster wagon, 3.23 and posi. All stock except for Monroe SS shocks, WS6 front sway bar and Crown Vic bolt-on rear bar. AC Delco O2 sensor and spark plugs - MANDATORY! And now new GM rear LCAs and steering shaft. Air Lift 1000s installed. Also new center link and idler arm for MUCH less wander. Tie rods. Steering box adjusted for bearing preload and sector shaft interference.

** For sale in exchange, power vent windows and motors for wagon.
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post #2 of 3 (permalink) Old 11-21-2016, 12:40 PM
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Location: Newcomerstown,Oh
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I had similar problem with my 92. The plug for the resistor pack wasnt makin good contact so i bent the plugs a lil to get it to work. Never did check power from hvac once i got it workin

96 BBB 9c1. Rebuilt out of lets just say north of 30 cars.
94 MGR L99. Met a bridge.
92 White L03. Ran to death.
94 OSP 9C1. Lawn ornament.
91 Silver L03. Whales on ice is sad.
94 Black 9c1 clone. Sacrificed.
92 DCM to flat black L03 RMW. Blowed up... twice.
96 Black Woody RMW. Cannibalized.
92 Grey RMS L05. New daily driver.
"i built it one piece at a time, and it didn't cost me a dime!" Johnny Cash
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post #3 of 3 (permalink) Old 11-21-2016, 04:26 PM
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The electronic climate controls have a transistorized fan control unit. If it fails, the motor will not run. At some point the fan control will probably fail. The only remedy is to replace it. Having a spare is a good way to check the operation. You can disconnect the one in the car, and hook up the other one. If the fan runs, you have found the problem. New modules are extremely expensive and the aftermarket fans do not move air nearly as well as the OEM units.


I also had a fan that would work with an outside source of power, but not in the car. The brushes in the motor wear out, and if it is in the wrong position for too long, they no longer make contact with the commutator. The motor is not rebuildable. It is also a herculean task to remove the fan from the shaft.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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