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71 Heater Core Replacement no Air
Thread Starter
Safety Car
Joined: Mar 2005
Posts: 4,255
Likes: 82
From: Brampton Ont.
71 Heater Core Replacement no Air
Just did a heater core replacement, everything went well. Temperature is reading approx. 160 but only drops down to about 140 when you move the controls on the console. The mechanical cable that opens and closes the flap is operating properly since we see that there is a lot of travel in the cable and doesn't stick. We even installed a new foam seal kit to ensure a good fit and seal. Our question is why doesn't the interior vent temperature drop to below 140 and yes we used a gauge to get proper readings.
Any suggestions?
Any suggestions?
Thread Starter
Safety Car
Joined: Mar 2005
Posts: 4,255
Likes: 82
From: Brampton Ont.
We thought about that but the outside temperature is around 85 degrees and we measured the blower temperature at the lower floor vent.
I didn't think there would be that much of a difference between outside temperature of 85 as appose to vent temperature of 140.
I didn't think there would be that much of a difference between outside temperature of 85 as appose to vent temperature of 140.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
On your 71 w/ NO ac ... did you replace hc underhood ... or did you go thru dash?
Just did a heater core replacement, everything went well. Temperature is reading approx. 160 but only drops down to about 140 when you move the controls on the console. The mechanical cable that opens and closes the flap is operating properly since we see that there is a lot of travel in the cable and doesn't stick. We even installed a new foam seal kit to ensure a good fit and seal. Our question is why doesn't the interior vent temperature drop to below 140 and yes we used a gauge to get proper readings.
Any suggestions?
Any suggestions?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
It sounds like the hot water shut off valve [which should actuate when A/C is selected] isn't doing it's job. Otherwise you wouldn't have ANY hot water in the heater core to generate that heat. I'm assuming that you had the temp setting on "cold". If that is true, you have a problem with the temp selector adjustment, also.
Thread Starter
Safety Car
Joined: Mar 2005
Posts: 4,255
Likes: 82
From: Brampton Ont.
There was no hot water shut off on 1971Coupe's car, and it can't be actuated when the A/C is selector since it's never came with A/C. I always thought that the heater core will always have water runing throught it and there is a mechanically activated door which opens and closes to let the hot water/air into the cabin.
When the temperature control is set to the hottest point, the air temperature is 160, when set the the coolest point it goes down to around 130/140.
When the temperature control is set to the hottest point, the air temperature is 160, when set the the coolest point it goes down to around 130/140.
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Joined: May 2006
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From: Dayton, Ohio
There was no hot water shut off on 1971Coupe's car, and it can't be actuated when the A/C is selector since it's never came with A/C. I always thought that the heater core will always have water runing throught it and there is a mechanically activated door which opens and closes to let the hot water/air into the cabin.
When the temperature control is set to the hottest point, the air temperature is 160, when set the the coolest point it goes down to around 130/140.
When the temperature control is set to the hottest point, the air temperature is 160, when set the the coolest point it goes down to around 130/140.
