Search found 242 matches

by JohnHere
Tue May 26, 2020 8:45 am
Forum: Automotive Air Conditioning Forum
Topic: Problem understanding gauge readings
Replies: 2
Views: 580

Re: Problem understanding gauge readings

A few general observations to start: Based on your pressure readings, it appears to me that all three cars are empty of refrigerant or nearly so. One of them, the 1990 Mercedes, originally used R-12 refrigerant unless it was converted sometime during its life to R-134a. Do you know whether that's th...
by JohnHere
Mon May 25, 2020 7:39 am
Forum: Automotive Air Conditioning Forum
Topic: R4 compressor NEVER cycles
Replies: 15
Views: 1918

Re: R4 compressor NEVER cycles

Very nice looking, clean Suburban by the way. I used to live in your area, so I know a little something about the Texas weather. Here's another thing you could try, although a bit of a nuisance: When you think it might be icing up, pull over and look at the drain tube underneath. If little to no con...
by JohnHere
Sun May 24, 2020 7:33 am
Forum: Automotive Air Conditioning Forum
Topic: First Post!! Help
Replies: 11
Views: 2064

Re: First Post!! Help

A few additional thoughts. Are you the original owner of this vehicle, and do you know whether the system has been serviced previously? Also, Al9 brought up an interesting point about the state of the charge. If you haven't already done so, I suggest having the refrigerant recovered and weighed to d...
by JohnHere
Sun May 24, 2020 7:01 am
Forum: Automotive Air Conditioning Forum
Topic: R4 compressor NEVER cycles
Replies: 15
Views: 1918

Re: R4 compressor NEVER cycles

I'm wondering, though, whether the evaporator is actually freezing up. When you think it is, do you also notice a marked reduction in airflow from the vents along with a change in sound from the blower?
by JohnHere
Fri May 22, 2020 5:58 pm
Forum: Automotive Air Conditioning Forum
Topic: First Post!! Help
Replies: 11
Views: 2064

Re: First Post!! Help

Equal pressure on both the low and high sides also suggest to me that the compressor clutch might not be engaging and that you're seeing only static pressures. Are you sure the clutch is energizing, pulling in, and turning the compressor shaft when you turn on the system?
by JohnHere
Tue May 19, 2020 8:46 am
Forum: Automotive Air Conditioning Forum
Topic: Which fitting do I need to adapt to hose guage manifold?
Replies: 3
Views: 1162

Re: Which fitting do I need to adapt to hose guage manifold?

The correct adapters fitted to the red and blue hoses, connected to the system, will depress the Schrader valves when you rotate the thumb wheels fully clockwise.
by JohnHere
Tue May 19, 2020 8:35 am
Forum: Automotive Air Conditioning Forum
Topic: Which fitting do I need to adapt to hose guage manifold?
Replies: 3
Views: 1162

Re: Which fitting do I need to adapt to hose guage manifold?

Your pictures didn't appear, but I think I know what you mean. Why not make it simple? Return the can with the attached hose and purchase a can of R-134a (pure refrigerant only...no sealer or other additives), a valve for the self-sealing can, and connect the valve directly to the yellow hose from y...
by JohnHere
Sun May 17, 2020 10:43 am
Forum: Automotive Air Conditioning Forum
Topic: 1988 corvette, don't understand what it's doing?
Replies: 58
Views: 10014

Re: 1988 corvette, don't understand what it's doing?

Fan(s) working okay? I don't think you mentioned that previously. You did mention that the lines, hoses, and condenser appear to be open, although old hoses can deteriorate internally, not be obvious, and cause a blockage—something else to consider in a 32-year-old system. I don't think it's the com...
by JohnHere
Sat May 16, 2020 6:05 pm
Forum: Automotive Air Conditioning Forum
Topic: 99 silverado ac drier frosts up
Replies: 4
Views: 1350

Re: 99 silverado ac drier frosts up

According to my references, the Crew Cab model takes 36 ounces of R-134a while the regular cab model takes 32 ounces. Charged directly from the small "12-ounce" cans without using the proper equipment, you won't notice that the actual amount each can holds often varies quite a bit. So I th...
by JohnHere
Sat May 16, 2020 2:38 pm
Forum: Automotive Air Conditioning Forum
Topic: 1988 corvette, don't understand what it's doing?
Replies: 58
Views: 10014

Re: 1988 corvette, don't understand what it's doing?

Might be a combination of a clogged condenser and a bad accumulator, possibly with loose desiccant beads floating around inside. As someone else mentioned, if you're seeing +/–400 PSI on the high side, the compressor is doing its job. With those kinds of pressures, don't forget to wear your PPE when...

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