Heater control Valve
#1
Heater control Valve
So last question today. Again I have a 1974 455 that I am putting in a 1970 Cutlass Supreme and they are calling for 2 different heater control valves. Which one do I use?
#7
Your 70 requires a heater control valve that is normally closed and opens when vacuum is applied. The 1974 heater control valve is normally open and closes when vacuum is applied, so exactly opposite of what the car needs. And be careful if buying a new one. Like most Oldsmobile parts, nearly all of the vendor catalogs have these valves listed incorrectly.
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