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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


Heater Control Valve

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G3GM :: G3 Tech :: Engine & Driveline

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Heater Control Valve Empty Heater Control Valve

Post by Hawk03 Wed Aug 17, 2016 5:54 pm

I can't seem to remember how the heater control valve is installed. Can anyone post a pic of how it should be installed?

Heater Control Valve 74605
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Heater Control Valve Empty Re: Heater Control Valve

Post by fasrnur Wed Aug 17, 2016 6:44 pm

Mine came out of the port next to the thermostat housing. I took mine out and put one in the heater hoses. Heater Control Valve Engine10

I hated the look of having hoses running over the intake, so I did this.
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Heater Control Valve Empty Re: Heater Control Valve

Post by Mcarlo77 Wed Aug 17, 2016 7:27 pm

Here you go!

Heater Control Valve Engine10

Heater Control Valve Engine11
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Heater Control Valve Empty Re: Heater Control Valve

Post by Hawk03 Wed Aug 17, 2016 9:38 pm

Ah, make sense now, thanks guys. One of the 3 HVAC vacuum hoses from the firewall connects to the heater control valve correct?
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Heater Control Valve Empty Re: Heater Control Valve

Post by Mcarlo77 Wed Aug 17, 2016 10:58 pm

That's correct. Mine was missing and I haven't gotten around to splicing a new one onto it as the A/C is inoperative anyway.
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Heater Control Valve Empty Re: Heater Control Valve

Post by Hawk03 Thu Aug 18, 2016 8:53 am

Thanks Mcarlo77! I think I have the vacuum hoses figured out and need to figure out the wiring. I also need my car back so I can try and install it all to see if it works.
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