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Classic/Antique Car Repair/1970 impala a/c blower not working

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Expert: - 12/4/2009


Question
I read your post about you blower not working. I'm having a similar issue. My blower isn't working but my compressor responds to the controls. I changed the a/c fuse and still no blower...... Can you assist with a possible resolution to this problem?

Answer
There are several items that could cause this problem. First is the blower motor itself. there is one connection on the blower that is hot (voltage present) when the system is on and the blower switch is on. To check the motor I usually make up a jumper wire and connect the motor to the POS terminal of the battery. If the motor is ok it will run when jumped. If the motor is ok then the problem is the relay, the resistor, or the switch on the dash. The first step to check is to disconnect the wire at the motor, turn the system on at the dash and use a voltmeter or test light to check for voltage at the wire. If there is no voltage then it is time to get a wiring diagram from a manual and follow the circuit back through the switch, relay, and resistor.
Brad

Classic/Antique Car Repair

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Brad Sears

Expertise

All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.

Experience

Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

Education/Credentials
More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

Awards and Honors
Moto Award winner. And much more.

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