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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


AC Blower Box

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Post by MaliCrusier / Mitch Wed Oct 09, 2019 5:20 pm

Does anybody happen to have pictures of the factory ac blower box and all of it's corresponding wiring plugged in? Need a reference of where everything plugs in for my own. Thank you in advance!
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Post by 73ss Wed Oct 09, 2019 7:23 pm

I have a 73 I can take some pics of. Your car is a 74?

74 is different.
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Post by MaliCrusier / Mitch Thu Oct 10, 2019 1:06 am

Yeah, mines a 74
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Post by g3chevy / Mr Pontiac Thu Oct 10, 2019 5:59 pm

Not sure if this pic will help but its from an all original 74 El Camino I parted out last year. I have a 75 Laguna that is very similar that I can take a pic of as well if this one doesn't work.

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Post by MaliCrusier / Mitch Thu Oct 10, 2019 6:09 pm

That helps a lot g3Chevy! There's one more plug between the blower motor and the ac box I believe, would you mind snapping me a picture of it wire plug?
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Post by g3chevy / Mr Pontiac Fri Oct 11, 2019 12:46 pm

Here's some pics of my 75 El Camino which may help you out.

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Post by MaliCrusier / Mitch Fri Oct 11, 2019 12:49 pm

Thanks g3!
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Post by MaliCrusier / Mitch Fri Oct 11, 2019 12:51 pm

It's currently 30 degrees and windy outside so I'm clearing my garage up to get the Chevelle inside so I can try to get my heater working
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Post by g3chevy / Mr Pontiac Fri Oct 11, 2019 1:38 pm

The weather definitely changed! We went from 77 degrees this morning to 56 degrees at noon. Pretty chilly for Houston. Good luck getting your A/C box put back together. At least you can work in the garage which is always a plus when its 30 degree outside.
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Post by MaliCrusier / Mitch Fri Oct 11, 2019 4:42 pm

Yes garages help a lot! just wish it was more than a 1 car, these cars are not small...
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Post by dcubbler Fri Feb 05, 2021 8:47 am

Hello and thanks for all your advice.  We have a 74 monte and got it in pieces.  Trying to figure out where the two yellow wires that run down the back of the firewall from the evaporator go.  They come from the vacuum selector and go to the resistor plug on the AC evaporator box. My question is what is the switch that goes in between?  Is it a pressure switch or temp sensor?  And where does it attach?   Thanks so much for any help.

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Post by g3chevy / Mr Pontiac Fri Feb 05, 2021 11:48 am

If I recall correctly, those 2 yellow wires plug into a thermal switch that screws into the back of the passenger side cylinder head. That allows the blower motor to turn on low after the engine is up to operating temperature so there is constant circulation in the passenger compartment.
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Post by dcubbler Fri Feb 05, 2021 12:04 pm

Does this look like the switch you are referring to? And does it simply screw into a 5/16 hole in the head?

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Post by dcubbler Fri Feb 05, 2021 12:07 pm

AC Blower Box D1e46c10

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Post by g3chevy / Mr Pontiac Fri Feb 05, 2021 12:10 pm

Yes, and yes.
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Post by dcubbler Fri Feb 05, 2021 2:36 pm

G3 thanks so much. Final question - does this need some sort of gasket? I know one of those yellow wires has 12v so what prevents it from grounding to the motor?

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Post by g3chevy / Mr Pontiac Fri Feb 05, 2021 3:29 pm

Those 2 yellow wires originally had a plastic socket that the wires went into. Kind of like this one without the hump.

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