How does the heater control valve work?
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Senior Member
Joined: Jan 2009
Posts: 611
Likes: 2
From: DE
Car: 1990 Firebird Formula
Engine: LB9 - 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73, LSD
How does the heater control valve work?
I was messing around with mine today. I see that applying vacuum to it lifts a metal block off. Does the valve just allow more or less antifreeze flow through the heater core?
It looks like it always allows some, but applying vacuum would open the port, allowing extra to flow back through again after leaving the heater core.
It looks like it always allows some, but applying vacuum would open the port, allowing extra to flow back through again after leaving the heater core.
Member
Joined: Nov 2009
Posts: 338
Likes: 0
From: Sarasota, FL
Car: 1988 GTA
Engine: 400 CI
Transmission: 700R4
Re: How does the heater control valve work?
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