Search found 153 matches

by Al9
Tue Jul 07, 2020 12:54 am
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 48
Views: 5446

Re: 1961 cadillac conversion

thanks for the info. what would be the advantage of the variable displacement? what mods would be neaded to use the v7? Advantages? No cycling, less engine load as cooling demand decreases (the evaporator will actually get cooler as ambient temperatures go up, since the valve uses the discharge pre...
by Al9
Tue Jul 07, 2020 12:16 am
Forum: Automotive Air Conditioning Forum
Topic: Weird noise... from evaporator?
Replies: 4
Views: 382

Re: Weird noise... from evaporator?

The growling sounds like a discharge reed valve noise known as the Sanden rumble. If this is the cause, if the rumble won't quieten or go away by restoring the proper charge then it's fixed either by fitting a muffler or a new reed valve plate (or a new compressor equipped with a new reed valve plat...
by Al9
Mon Jul 06, 2020 3:24 pm
Forum: Automotive Air Conditioning Forum
Topic: Compressor Cycling
Replies: 4
Views: 450

Re: Compressor Cycling

Ahhh, the magic in a can. Too many seemingly qualified technicians leaving leaky Schrader cores in place and messing systems up with RRR stations alone. No need for ice-cold-air-in-a-can stuff. The only way to charge a modern MVAC system is pulling a real vacuum and then going by weight. After ensur...
by Al9
Sun Jul 05, 2020 12:33 pm
Forum: Automotive Air Conditioning Forum
Topic: Strange PSI's in AC system, no cold AC
Replies: 64
Views: 6616

Re: Strange PSI's in AC system, no cold AC

Your call. Good preventive course of action when dealing with an old car anyway. Compressors do eventually get old and worn no matter how you treat them. It simply gets to a point where you're beating a dead horse. That is, you finally manage to get a compressor to work right, but you also notice th...
by Al9
Sat Jul 04, 2020 8:00 am
Forum: Automotive Air Conditioning Forum
Topic: Strange PSI's in AC system, no cold AC
Replies: 64
Views: 6616

Re: Strange PSI's in AC system, no cold AC

I don't know its specs and how to test it, unfortunately.

Can you see a wire going to the compressor's back and ending in some kind of probe? That probe is the thermal switch i'm speaking about.
by Al9
Sat Jul 04, 2020 4:28 am
Forum: Automotive Air Conditioning Forum
Topic: Strange PSI's in AC system, no cold AC
Replies: 64
Views: 6616

Re: Strange PSI's in AC system, no cold AC

What i said is that your compressor, like most early rotary (vane or scroll) compressors, has a temperature switch that is meant to cut the clutch off (it's in series with the clutch) whenever the discharge temperature gets too high. An undercharge results in higher than normal superheat and this ca...
by Al9
Sat Jul 04, 2020 3:33 am
Forum: Automotive Air Conditioning Forum
Topic: Strange PSI's in AC system, no cold AC
Replies: 64
Views: 6616

Re: Strange PSI's in AC system, no cold AC

If i'm not mistaken he has a Sanden scroll. In that case it's likely the compressor body's temperature switch, either misbehaving or doing what it's supposed to do.

Might be a good time to have a pro service the system and rule out any undercharge/overcharge condition (or leak).
by Al9
Fri Jul 03, 2020 4:43 am
Forum: Automotive Flushing Forum
Topic: Contact cleaner for a DIY evaporator flush
Replies: 2
Views: 3068

Re: Contact cleaner for a DIY evaporator flush

Yeah, that makeshift flush did wonders. Can't seem to smell contact cleaner anymore when i blow gas duster through (managed to create adapters for the outlet and inlet), can't smell PAG oil anymore either and i also managed to flush it to the point that dye visibly stopped coming out (i think any le...
by Al9
Fri Jul 03, 2020 4:13 am
Forum: Automotive Air Conditioning Forum
Topic: Strange PSI's in AC system, no cold AC
Replies: 64
Views: 6616

Re: Strange PSI's in AC system, no cold AC

New compressor installation instructions usually require to repeat a 10 second compressor engaged, 10 second compressor disengaged cycle a few times. Seen these "few times" range from at least 5 times to 50 times (yes, pretty boring messing around with an AC switch and chronometer thing). ...
by Al9
Fri Jul 03, 2020 3:15 am
Forum: Automotive Air Conditioning Forum
Topic: Strange PSI's in AC system, no cold AC
Replies: 64
Views: 6616

Re: Strange PSI's in AC system, no cold AC

New clutch hub/pulley might be unburnished and slipping.

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