Search found 203 matches

by Al9
Thu Sep 03, 2020 1:43 am
Forum: Automotive Air Conditioning Forum
Topic: 2002 Pontiac Ram Air Trans Am ac is not cooling properly
Replies: 54
Views: 2881

Re: 2002 Pontiac Ram Air Trans Am ac is not cooling properly

The "automatic adjusting" stuff is nothing but an orifice tube that pretends to act as a cross-charged TXV, basically by restricting as the high side goes down due to limited compressor capacity and the opposite (the comparison comes from the fact that the cross charged TXV would be acting...
by Al9
Wed Sep 02, 2020 2:50 pm
Forum: Automotive Air Conditioning Forum
Topic: 2002 Pontiac Ram Air Trans Am ac is not cooling properly
Replies: 54
Views: 2881

Re: 2002 Pontiac Ram Air Trans Am ac is not cooling properly

Good. If you're looking at a replacement, i'd recommend you use the fixed one instead of the variable one. The compressor's control valve likes the suction pressure to be as steady as possible while it's operating within the "destroke" suction pressure zone. Whenever a TXV is used with the...
by Al9
Tue Sep 01, 2020 12:54 pm
Forum: Automotive Air Conditioning Forum
Topic: Full charge after only half the freon?
Replies: 12
Views: 442

Re: Full charge after only half the freon?

Exactly. At least minimum speed. If i owned that vehicle, i'd rewire it so that the rear blower is always running at least at minimum speed whenever front AC is on. Exactly like with my front AC-only little Kei car (a relay behind the dash keeps the blower on at minimum speed even if you rotate the ...
by Al9
Tue Sep 01, 2020 8:41 am
Forum: Automotive Air Conditioning Forum
Topic: Full charge after only half the freon?
Replies: 12
Views: 442

Re: Full charge after only half the freon?

Keep in mind that when the refrigerant is just a little low, the system might still perform satisfactorily but the compressor could be running oil starved. And HT6s are really reliant upon proper oil return rate. This gets critical if there's rear AC. Rear AC can basically turn into a refrigerant an...
by Al9
Tue Sep 01, 2020 2:52 am
Forum: Automotive Air Conditioning Forum
Topic: 2007 Ford AC low side cycling
Replies: 3
Views: 210

Re: 2007 Ford AC low side cycling

Adding refrigerant until you see correct pressures is a bad approach. It only starves the compressor of lubricant and nothing else.

Reclaim any refrigerant, leak test, vacuum and then charge by weight to the correct specs is what's supposed to be done.
by Al9
Mon Aug 31, 2020 7:53 am
Forum: Automotive Air Conditioning Forum
Topic: 2002 Pontiac Ram Air Trans Am ac is not cooling properly
Replies: 54
Views: 2881

Re: 2002 Pontiac Ram Air Trans Am ac is not cooling properly

Don't really know about equalization times as a diagnosis for compressor health and i think that other members could help you better. But your expansion device is a fixed dimension orifice tube, not a TXV (which depending upon its control curve could possibly get its orifice narrower and narrower as...
by Al9
Mon Aug 31, 2020 12:58 am
Forum: Automotive Air Conditioning Forum
Topic: 2002 Pontiac Ram Air Trans Am ac is not cooling properly
Replies: 54
Views: 2881

Re: 2002 Pontiac Ram Air Trans Am ac is not cooling properly

The ac has always blown cold but the variable displacement compressor would't "variable displace" and my evaporator would freeze up if I was on a drive longer than 1 hour with the ac on. Prolly a dirty or wrong pressure rating control valve here. One color up could be a nice thing to try ...
by Al9
Sat Aug 29, 2020 2:10 pm
Forum: Automotive Air Conditioning Forum
Topic: Low side high, high side low?
Replies: 7
Views: 373

Re: Low side high, high side low?

At that point, without knowing how much refrigerant is left within the system, the reason is still unknown. Yes, recharge by weight with the compressor not running and therefore into deep vacuum. That's how AC systems equipped with these compressors are supposed to be serviced. But first carefully c...
by Al9
Sat Aug 29, 2020 12:41 pm
Forum: Automotive Air Conditioning Forum
Topic: New compressor hard to turn by hand
Replies: 6
Views: 388

Re: New compressor hard to turn by hand

I'd just changed compressor and while i haven't turned it by hand, i'd say that the new one feels definitely harder on the engine than the old one was (this one definitely had some serious wear). Can feel the RPM dipping down as soon as it gets into full stroke (mine is variable displacement). Oil a...
by Al9
Sat Aug 29, 2020 2:49 am
Forum: Automotive Air Conditioning Forum
Topic: New compressor hard to turn by hand
Replies: 6
Views: 388

Re: New compressor hard to turn by hand

Have you loaded it with the proper amount and type of oil through the drain hole prior to rotating it? Did it already come with the proper amount of oil inside (better drain and check everytime)? Keep in mind that SP-10 is PAG 46, SP-20 is PAG 100 and SP-15 is apparently PAG 68 (not so widespread in...

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