On my '74, the problem was not with the heater matrix (with a warm
engine, plenty of hot air came out of the floor vents, but instead,
the problem was due to leaks of cold air into the car
The seal on the vent flap had turned to dust and so, even when closed,
plenty of cold air came in. Also, air leaked around the pipes that
feed the face-level vents where these pipes come through the bulkhead
(firewall). Any suggestions on fixing these?
OTOH the PO had increased the heat entering the car by removing the
plug in the bulkhead -- I had air from the engine compartment coming
straight into the passenger compartment. Interesting in the Texas
summer!
Regards,
Simon
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