Defroster vents

From your serial number, this is a '73 L model. Some things to check on:all Panteras use cheap paper flex-hoses to rout air from the box to the end defroster vents. The center one is direct-coupled. The hoses deteriorate over time (30 years!) and/or fall off. The drivers side hose is the longest so it naturally has less airflow. In addition, the box lid was originally sealed with urethane putty which may have shrunk up, allowing air to leak out. Finally, your car should have a two-speed blower fan; IMHO the low speed is useless even when everything else is correct. You may need to pull the dash to reconnect the vents. This is tedious but not difficult.

Ok Jack, guess my work is cut out for me. Still have the frozen valve (in the cold position) also to deal with.
By the way it is a 74L. Don't know why your numbers don't agree.
Thanks for the advice. Mike

The frozen water valve is rebuildable pretty cheaply, once its freed up. After you remove & disassemble it, there's a single tiny o-ring in there thats the only seal. If it isn't leaking, the old o-ring's probably OK. Or, some vendors may have one; McMasters-Carr in LA certainly have such. I used silicone grease on mine and its still working a decade later. The '73/74 thing? It's 'cause your car was likely built on 10/73 (decode-able from the full serial number; #6329 & 6330 were built 10/73) and in CA anyway, most such owners had their registration changed to the build date, not the date of first registration. This is because the CA Smog laws exempt cars up to '73 from all Smog testing. So I assumed.... Sorry.

No problem Jack. yes I knew the build date on my car also. It has always been registered in CA but Never had an EGR valve installed. When I bought the car it passed without the EGR. Could have polluted twice as much and still pass!
I was in the console looking that heater valve over and couldn't even get my had in there let alone tools!
Might wait for a tech session this year and see how it is done by the pros.
Until then, I am just fine without heat. No problem so far and we are past the cold here.
I just bought the car last October and still need to lean things about it.
One step at a time
Most everything has already been updated so no serious problems coming up for me...fingers crossed of course!

Wink, pull off your central-left side(drivers), plastic kick panel, follow the control cable. The valve should be right there, on the bottom of the heater box just left of center. Shoot a couple of shots of WD-40 in the valve and "work" it loose. It worked for me. As far as the air ducts, lay on your back to look up behind the dash, it is possible to reach the paper hoses. It looks to me as if they may have fallen off or become crimped. Good-Luck, Marlin.

Marlin: Been there already on th eheater valve. It pinched my finger and caused a blood blister that still hasn't healed. I think a sliver of metel in my finger some where, lol.
So, I think the kitty won that battle.
I better wait till it fergets and try a sneak attack, eh?