I'm reasonably certain that Chrysler was first with a "re-heat" type system in which refrigerated air was passed through the heater core where it could be tempered for use on damp cool days. GM had two completely separate systems for heat and air conditioning using a common blower until 1963 when it made hay out of what Chrysler had been doing since 1959. From 60-64 full size Fords hung an evaporator under the dash which was great for making hot, nasty smelly cabin air colder.
GM having the best auto AC is nonsense. It was Airtemp.
Danny Plotkin
-----Original Message-----
From: "M L" <granitledge@xxxxxxxxx>
Sent: Thursday, July 4, 2024 5:29pm
To: "300 club" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} A/C and fresh air
--I am not referring to the FAN. It goes on when you press the Fresh or Max Cool buttons. The lever on the heater control valve pushes out to set the fan speed of low-medium-high.
The cowl vent is open when you push fresh cool, defrost and heat. However, when you push defrost and heat all the cowl air goes through the heater core even if the valve is off. When you push the fresh cool only 25% of the air passes through the heater core.
I am looking for that.
James
From: John <spiers@xxxxxxxxxxxxxx>
Sent: Thursday, July 4, 2024 09:29
To: James Douglas <jdd@xxxxxxxxxx>
Cc: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} A/C and fresh air
James & all,
I can't find this detail in my 1964 owner's manual, but I believe your planned wiring project is already built in to the car's operation - if you have the a/c on (button depressed as normal) and you pull it out, the fan remains on, but the compressor turns off.
Try it!
Happy 4th to all.
John in Florida
On Thu, Jul 4, 2024 at 11:50 AM, 'James Douglas' via Chrysler 300 Club International
One of the things I do not like that Chrysler did starting in 1959 was the new heater – A/C design. If one wants cowl air in these cars without the compressor running --- one cannot get it.
When you press the Fresh Cool button, the vacuum switches close the recirculating door and open the cowl door. But it also turns on the A/C Compressor.
I was thinking of putting in a switch someplace in the cockpit and run the compressor wire (Electromagnet lead) through it and back to the compressor lead. That way I can open the circuit and then press the Fresh Cool and just move air from the cowl into the cockpit.
Anyone ever do this or something like it?
Sometimes it is nice to get fresh air without heat or A/C on and still have the windows closed.
Happy 4th to everyone.
James
PS. On my ’47 Desoto I can manually open the cowl air and/or send it through the heater cores. I can also have it closed and have the twin heater cores pull all air (recirculating) from the cockpit. On the ’49 they moved the heater core to the front of the engine bay up against the radiator support. You only choice is fresh heat. No recirculating heat. Not a good system. It seems like they could never come up with a standardized methodology on the heating and A/C. I think those decisions were slaves to other considerations.
--
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