Ash84 Posted September 4, 2021 Report Share Posted September 4, 2021 Hey fellas I got a 50 Plymouth handed to me so I'm trying to figure out all the kinks. When I'm driving it feels like the heater is on even when I have it all turned off. Can any one give a clues, is there a thermostat valve I'm missing? Quote Link to comment Share on other sites More sharing options...
keithb7 Posted September 4, 2021 Report Share Posted September 4, 2021 Blower motor stuck on, or wired on full time? Is a blower motor actually blowing hot air into the cab? Quote Link to comment Share on other sites More sharing options...
allbizz49 Posted September 4, 2021 Report Share Posted September 4, 2021 (edited) There might be a valve to turn the hot water off so it doesn't flow through the heater. My 49 and 53 both have them. My 53 has "summer" with an arrow pointing in the direction to shut the water off on the heater box. Edited September 4, 2021 by allbizz49 2 Quote Link to comment Share on other sites More sharing options...
Doug&Deb Posted September 4, 2021 Report Share Posted September 4, 2021 Is there a valve screwed into the rear of the cylinder head? Some applications have a shutoff valve for the heater. Quote Link to comment Share on other sites More sharing options...
busycoupe Posted September 4, 2021 Report Share Posted September 4, 2021 There should be a thick sisal pad on the inside of the firewall to insulate for heat and sound. Even with that pad in place and the heat shut off, my coupe gets quite warm. It is pleasant in cool weather, not so much in warm weather. I think these cars just get hot in the cab from engine and exhaust heat. 1 Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 4, 2021 Report Share Posted September 4, 2021 My 51 has a water shut off valve AND an air shut off flap in the duct work. Neither really help so I think busycoupe is on to something. Quote Link to comment Share on other sites More sharing options...
greg g Posted September 4, 2021 Report Share Posted September 4, 2021 Cowl vent opening all the way? Shutoff closing all the way? You can take off the feed hose and make a wood plug and clamp it or hook the feed line to the return line with a piece of copper tube clamped in place and bypass the heater. My car has a sheet metal heat shield between the passenger side foot well and the exhaust pipe, is yours present and in place? Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 5, 2021 Author Report Share Posted September 5, 2021 21 hours ago, keithb7 said: Blower motor stuck on, or wired on full time? Is a blower motor actually blowing hot air into the cab? It seems the same with it on or off to day I turned it on to get some air flow with windows, because my hood vent will only open a 1/4 way open. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 5, 2021 Author Report Share Posted September 5, 2021 20 hours ago, allbizz49 said: There might be a valve to turn the hot water off so it doesn't flow through the heater. My 49 and 53 both have them. My 53 has "summer" with an arrow pointing in the direction to shut the water off on the heater box. I thought there is a valve but I feel like a idiot don't know where it's located. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 5, 2021 Author Report Share Posted September 5, 2021 13 hours ago, Doug&Deb said: Is there a valve screwed into the rear of the cylinder head? Some applications have a shutoff valve for the heater. I'v been told there is I will look in that location again. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 5, 2021 Author Report Share Posted September 5, 2021 13 hours ago, busycoupe said: There should be a thick sisal pad on the inside of the firewall to insulate for heat and sound. Even with that pad in place and the heat shut off, my coupe gets quite warm. It is pleasant in cool weather, not so much in warm weather. I think these cars just get hot in the cab from engine and exhaust heat. I figured they do to. I did have a decent ride to day because like you said it wasn't that hot out. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 5, 2021 Author Report Share Posted September 5, 2021 12 hours ago, greg g said: Cowl vent opening all the way? Shutoff closing all the way? You can take off the feed hose and make a wood plug and clamp it or hook the feed line to the return line with a piece of copper tube clamped in place and bypass the heater. My car has a sheet metal heat shield between the passenger side foot well and the exhaust pipe, is yours present and in place? I will look for the heat shield , that's for the rigging idea will keep that in mind. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 5, 2021 Author Report Share Posted September 5, 2021 Well I wish I would of looked at this post to day sence I was out driving you all been a big help. Thanks, I will post back with any results. Quote Link to comment Share on other sites More sharing options...
Booger Posted September 5, 2021 Report Share Posted September 5, 2021 Maybe cut a piece of thermal blanket (the shiny stuff) to use under mat/carpet Quote Link to comment Share on other sites More sharing options...
DJK Posted September 7, 2021 Report Share Posted September 7, 2021 Remove the duct work between the heater box and firewall, with engine up to temp., turn on blower motor, see if there is hot air coming from heater box. Once I adjusted the control arm on the heater box, hot air into the vehicle was eliminated on SUMMER setting. Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 8, 2021 Report Share Posted September 8, 2021 Some heater setups don't have a summer setting, mine doesn't. Might have to remove the duct and cover the opening to the passenger compartment for summer use. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 8, 2021 Author Report Share Posted September 8, 2021 3 minutes ago, Sniper said: Some heater setups don't have a summer setting, mine doesn't. Might have to remove the duct and cover the opening to the passenger compartment for summer use. Mine looks like it was replaced with a hose returning to what I think is the blower bow ( that's my technical term) Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 8, 2021 Author Report Share Posted September 8, 2021 Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 8, 2021 Report Share Posted September 8, 2021 (edited) That first picture you posted should be of a cable operated shut off valve. You don;t have that which is why it's blowing hot air all the time. I have one, still blows hot air but it might be leaking by internally. You can buy a manual shut off valve, sort of like the valve you hook your garden hose to. Close it in summer, open it for winter. Edited September 9, 2021 by Sniper not sure why something got censored, typo? Quote Link to comment Share on other sites More sharing options...
DJK Posted September 9, 2021 Report Share Posted September 9, 2021 On 9/7/2021 at 8:04 PM, Sniper said: Some heater setups don't have a summer setting, mine doesn't. Might have to remove the duct and cover the opening to the passenger compartment for summer use. Been there done that last summer, before I corrected the adjustment. Quote Link to comment Share on other sites More sharing options...
Ash84 Posted September 10, 2021 Author Report Share Posted September 10, 2021 On 9/7/2021 at 8:20 PM, Sniper said: That first picture you posted should be of a cable operated shut off valve. You don;t have that which is why it's blowing hot air all the time. I have one, still blows hot air but it might be leaking by internally. You can buy a manual shut off valve, sort of like the valve you hook your garden hose to. Close it in summer, open it for winter. OK good to know I'm getting car out tomorrow and getting my front cross member replaced at a classic car garage so I will ask him where i can get that set up. Im sure he will know what your talking about. Quote Link to comment Share on other sites More sharing options...
Andydodge Posted September 10, 2021 Report Share Posted September 10, 2021 Ash.....just read this thread, hope you get the heat sorted out BUT........you mention getting the front crossmember replaced(!)...............whats the reason for that?........andyd Quote Link to comment Share on other sites More sharing options...
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