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1971 Chevy Nova Heater control valve

Tiny
944DESMO
  • MEMBER
  • 1971 CHEVROLET NOVA
Heater problem
1971 Chevy Nova V8 Two Wheel Drive 9999 miles

1971 Nova undergoing complete resto. Car had a heater control valve and air conditioning.

In the vacuum line diagrams, we are shown that on cars with a heater control valve there should be three lines coming off the vacuum switch, which is controlled by the heater control levers behind the dash.

Our vacuum control switch only has two lines.

Since the heater control valve is designed to be closed by vacuum (no hot water through heater core) is there a chance that this car was not equipped with a vacuum line to the heater control valve?

Why even have a heater control valve if you're not going to hook up the vacuum line?
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Wednesday, August 27th, 2008 AT 3:47 PM

1 Reply

Tiny
BOWTIE BABY
  • MEMBER
  • 101 POSTS
Its possible someone changed the control valve on the dash, does it have an ac setting? I didnt think the ac cars had shut off valves, some one may have put it in there to connect two hoses. If there is no vacuum line in site you mite wanna try removing it. I dont think they would put one in with no vacuum line at the factory. Good luck, Rod
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Monday, February 2nd, 2009 AT 3:34 AM

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