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by bohica2xo
Thu Aug 20, 2020 6:22 pm
Forum: Automotive Air Conditioning Forum
Topic: Help me diagnose my AC
Replies: 28
Views: 2132

Re: Help me diagnose my AC

System is either full of air, or your condenser is not doing the job.

How way it evacuated?

Any other repairs? Why was it recharged?
by bohica2xo
Thu Aug 20, 2020 3:46 pm
Forum: Automotive Air Conditioning Forum
Topic: Help me diagnose my AC
Replies: 28
Views: 2132

Re: Help me diagnose my AC

What is the ambient temperature?

Are those pressures at idle or 1800 rpm?
by bohica2xo
Mon Aug 17, 2020 3:16 pm
Forum: Automotive Air Conditioning Forum
Topic: 1979 F150 will not cool below 60F register temps/evap partially warm
Replies: 11
Views: 1221

Re: 1979 F150 will not cool below 60F register temps

You are undercharged.

Charge 100% of the R12 charge.

The poor vacuum does not help. Not so much moisture, but remaining non-condensable gasses will raise head pressure.

If a 100% charge still leaves the evaporator warm in one place, you may have a defective evaporator.
by bohica2xo
Sun Aug 16, 2020 8:51 am
Forum: Automotive Air Conditioning Forum
Topic: 1970 Oldsmobile AC Woes
Replies: 6
Views: 1259

Re: 1970 Oldsmobile AC Woes

90 psi on the low side port sounds like a stuck (or badly misadjusted) POA valve.

Here is a video of testing the POA:

https://www.youtube.com/watch?time_continue=68&v=PhWW7hD9-Yw&feature=emb_logo
by bohica2xo
Sat Aug 15, 2020 9:12 am
Forum: Automotive Air Conditioning Forum
Topic: Discharge pipe burst - add how much oil?
Replies: 6
Views: 688

Re: Discharge pipe burst - add how much oil?

Do it right, do it once.

Or do it over & over.

When the compressor fails, the shards will block a few passages in the condenser. Then the performance with the new compressor will be poor...
by bohica2xo
Sun Aug 09, 2020 12:53 pm
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 57
Views: 11674

Re: 1961 cadillac conversion

I have no idea what sort of core they provided. A large, folded fin plate style evaporator like this was common for cars that size:


https://www.rockauto.com/en/moreinfo.php?pk=814196&cc=1445060&jsn=917
by bohica2xo
Sat Aug 08, 2020 2:46 pm
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 57
Views: 11674

Re: 1961 cadillac conversion

15 psi 134a is around 15f. If your lines in & out of the evaporator are cold enough to freeze atmospheric moisture, then the core is that cold as well. If you are blowing air over an evaporator that is that cold it will be very cold on the discharge side. Well, at least until the core freezes so...
by bohica2xo
Fri Aug 07, 2020 10:34 am
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 57
Views: 11674

Re: 1961 cadillac conversion

Your evaporator core is cold as hell. Your vent air is not going over it.
by bohica2xo
Sun Aug 02, 2020 9:46 pm
Forum: Automotive Air Conditioning Forum
Topic: Weak Compressors, or bad orifice tube?
Replies: 24
Views: 3727

Re: Weak Compressors, or bad orifice tube?

A cold accumulator with 74f discharge air indicates some blend air entry.
by bohica2xo
Sun Aug 02, 2020 5:57 pm
Forum: Automotive Air Conditioning Forum
Topic: Weak Compressors, or bad orifice tube?
Replies: 24
Views: 3727

Re: Weak Compressors, or bad orifice tube?

Book vs underhood sticker - sticker wins. Jeep tends to change systems mid year.

Your high side is in line with a proper charge with that ambient.

A restricted OT could certainly cause problems, but this could be re-heating as well. Is the accumulator cold?

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