Automotive Air Conditioning Information Forum (Archives)

bigcoaxum on Fri June 17, 2011 10:39 AM

Year: 1973
Make: Chevrolet
Model: Impala
Engine Size: 350
Refrigerant Type: 134A

I need to know the location of the Blower motor Resistor and the Blower motor Relay. I think I have found the relay (small silver metal box) under the hood. Any pictures would be helpful. My blower speed only blows on high and i have changed the switch. Please Help!

TRB on Fri June 17, 2011 11:54 PM

If I'm not mistaken. I should be mounted to the evap case on the firewall.

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NickD on Sat June 18, 2011 6:43 AM

Got on a tech boating site where a ton of guys reply to a question that don't know what the hell they are talking about that. Be far better off if they just got off that I am in the process of doing. And being accused of being too technical. It is technical!

On the verge of doing that myself, 1973 was a long time ago with many changes to vehicles. But have always found the blower resistors mounted downstream of the blower box, has to be there for that air blast or they would burn up. Using undersized power rating resistors has not changed.

Memory barely tells me the blower box was mounted in that small space between the then steel right front fender, they use a piece of plastic now and the firewall. Can peek inside with a flashlight to see if you have a bunch of wires going in there from under the hood. Kind of recall having to remove the front bumper and right front fender to access it. Definitely recall having to remove the entire dash to do any heater core or evaporator work. Think it was in 1974 that GM moved the evaporator and blower box under the hood for easy access, but then anything on that side of the engine was difficult to work on with that thing in the way.

Take a peek and let us know.

Those were the years the EPA was just formed playing all kinds of games with emissions, that is when working on vehicles really went to hell giving a bunch of idiots full legal authority.