OK, Tiny
He is talking about his 1951 truck.
Sorry - I was trying to help him.
What kind of heater do you have in your 1938 truck?
Presumably, it does not have an "automatic" Ranco heater control valve (as was available in in the "deluxe" heaters 1951)?
JD, what style heater do you have in your truck?
Recirculating - no Ranco valve
Air Flow - Ranco valve
Fresh Air - Ranco valve
Other, non-GM
