Search found 273 matches

by Al9
Mon Feb 15, 2021 2:40 am
Forum: Automotive Air Conditioning Forum
Topic: New A/C compressor locked up after not operating for 6 months
Replies: 10
Views: 3901

Re: New A/C compressor locked up after not operating for 6 months

How much is the question. I've heard of (let's specify some) new comps stating pre-charged yet turning up with less than the system amount of oil inside. Good habit is to drain any oil out of the new comp, dispose of any drained oil properly, and then refill it to the proper amount with commercial D...
by Al9
Tue Feb 09, 2021 1:22 pm
Forum: Automotive Air Conditioning Forum
Topic: New A/C compressor locked up after not operating for 6 months
Replies: 10
Views: 3901

Re: New A/C compressor locked up after not operating for 6 months

A compressor needs oil to not seize up. Especially this compressor design, inside of which a set of piston shoe bearings ride the edges of a swash plate. Picks oil from the suction refrigerant stream. Not enough oil in the right places at the right times, and things start scraping almost like a fing...
by Al9
Sat Jan 23, 2021 3:46 am
Forum: Automotive Air Conditioning Forum
Topic: Help with refrigerant
Replies: 4
Views: 1359

Re: Help with refrigerant

20 years open to the elements means badly corroded evaporator, condenser and piping IMHO
by Al9
Fri Jan 22, 2021 2:46 pm
Forum: Automotive Air Conditioning Forum
Topic: A/C controls
Replies: 5
Views: 1754

Re: A/C controls

Cusser is right, with fixed displacement compressors automatic temperature control (that kind of AC where you set the interior temperature you want in digits) is accomplished by adding heat and/or regulating blower speed and/or air recirculation percentage. Regulating interior temperature by directl...
by Al9
Mon Jan 18, 2021 3:01 am
Forum: Automotive Air Conditioning Forum
Topic: 1996 Cadillac Seville new AC question
Replies: 8
Views: 1855

Re: 1996 Cadillac Seville new AC question

Beware, a system with a not so efficient condenser/condenser fan (or severely overcharged on oil) can behave like it's overcharged even when the correct amount of refrigerant is inside. My car's AC had the former issue (a severely worn electric fan motor that didn't allow the fan to move enough air ...
by Al9
Sun Jan 17, 2021 4:59 pm
Forum: Automotive Air Conditioning Forum
Topic: 1996 Cadillac Seville new AC question
Replies: 8
Views: 1855

Re: 1996 Cadillac Seville new AC question

Careful with the jumping a comp back to life stuff - this is what can happen if the problem is not enough refrigerant (static pressures can be really deceptive) and the compressor is not getting enough oil flowing back as a result. Whenever a low charge is suspected, recover, weigh and assess. No ot...
by Al9
Fri Jan 15, 2021 3:01 pm
Forum: Automotive Air Conditioning Forum
Topic: compressor oil quantity
Replies: 6
Views: 1922

Re: compressor oil quantity

For the sake of clarity, here in Europe PAG 68 isn't OEM Sanden SP-15 - the OEM oil is pretty hard to find here too. PAG 68 is just an easily available AC lubricant also sold as "Universal PAG" under different brands. Viscosities are an intermediate between PAG 100 and PAG 46 - for some re...
by Al9
Thu Jan 14, 2021 1:47 am
Forum: Automotive Air Conditioning Forum
Topic: compressor oil quantity
Replies: 6
Views: 1922

Re: compressor oil quantity

I'd say to read the new compressor's label/instructions in order to know which oil is needed, since Sanden SD7H15 comps are known to use different oil viscosity grades. SP-10 oil is PAG 46, SP-20 is PAG 100 and SP-15 is an intermediate grade oil (some say use PAG 68, which can be really hard to find...
by Al9
Tue Jan 12, 2021 4:26 am
Forum: Automotive Air Conditioning Forum
Topic: Evaporator fin density and differing TXV adjustments
Replies: 5
Views: 4281

Re: Evaporator fin density and differing TXV adjustments

I'd like to update this thread with new findings. In my quest to find a suitable (and possibly even better) replacement TXV for my car's VDC system (whose OEM TXV is now an NLA part), i tested two TXVs used with both Scion xB evaporator styles. I've tested a Denso 447500-2390 (Toyota PN 88515-52040,...
by Al9
Fri Jan 08, 2021 6:15 am
Forum: Automotive Air Conditioning Forum
Topic: AC restoration questions, '93 Mazda RX7
Replies: 36
Views: 12868

Re: AC restoration questions, '93 Mazda RX7

Orings have to be lubed (with a non-hygroscopic AC lube/AC o-ring lube, such as the good ol' mineral, and Ester, unfortunately, is hygroscopic).