1966 poor heating | Ford Thunderbird forum club group 1955-2005 models

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1966 poor heating

  • Thread starter Thread starter Al63
  • Start date Start date
Al63

Al63

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Thunderbird Year
1966
Hi,

Heating is poor in my 66.
I replaced the water valve 5 years ago and I tested it last week. It seems okay.
I have 8 to 17 inches of mercury vacuum on the line connected to it (depending on the position of the Hi/Lo selector lever).
The heater hoses going to and from the heater core are hot
The blower motor is okay
the blower door operates normally.
But despite all that, the air blown into the car is tepid.

Any idea?

Thanks

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Have you checked your vacuum control system for any leaks or disconnected hoses? The heater/ac switch operates off of the vacuum control system.
 
My1966T-Bird said:
Have you checked your vacuum control system for any leaks or disconnected hoses? The heater/ac switch operates off of the vacuum control system.
Click to expand...
I am not sure to understand what you mean by "The heater/ac switch operates off of the vacuum control system".
Where are this/these switch(es)?
Are they connected to a vacuum line?
Thanks
 
Pull the blower motor out and make sure your heater core is clean. Many a mouse has built a nest in a heater box blocking airflow.
 
Al63 said:
I am not sure to understand what you mean by "The heater/ac switch operates off of the vacuum control system".
Where are this/these switch(es)?
Are they connected to a vacuum line?
Thanks
Click to expand...
The switches that you operate on the dash connect to the vacuum control system under the dash.
 
Thank you all for your thoughts.
I will check the heater core cleanliness.
However I wonder how the ventilation works. The blower motor sucks the air through the heater core. But where the fresh air is coming from? Is there a door upstream the heater core? Could it be closed or blocked?
 
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