Search found 260 matches

by Dougflas
Sat Nov 23, 2019 6:04 am
Forum: Automotive Air Conditioning Forum
Topic: Ac not as cold when car warms up
Replies: 18
Views: 2130

Re: Ac not as cold when car warms up

Clamp off the heater.
by Dougflas
Fri Nov 15, 2019 6:52 am
Forum: Automotive Air Conditioning Forum
Topic: Purging With Nitrogen ???
Replies: 3
Views: 1016

Re: Purging With Nitrogen ???

Excellent idea to flush with dry N2. This makes for a better vacuum process.
by Dougflas
Sat Oct 19, 2019 12:49 pm
Forum: Automotive Air Conditioning Forum
Topic: Restriction?
Replies: 11
Views: 1669

Re: Restriction?

TXV sensing bulb is upside down. The entrance of the capillary should be pointed up to make sure liquid does not influence the TXV diaphragm. If I was doing this, I would change the TXV. The vertical line (left side of picture) is the input of the TXV. The TXV line at 3 o'clock position is the TXV o...
by Dougflas
Thu Oct 17, 2019 1:21 pm
Forum: Automotive Air Conditioning Forum
Topic: Restriction?
Replies: 11
Views: 1669

Re: Restriction?

If you had a restriction, you would have a freeze up at the restriction point. Mist the condenser with a hose and see if high side psi drops. It may be that you have not enough refrigerant in the system and not enough air flow across the condenser. You can test the TXV operation by alternating placi...
by Dougflas
Fri Sep 06, 2019 6:58 am
Forum: Automotive Air Conditioning Forum
Topic: '99 F250 Super Duty- immediate low side drop
Replies: 22
Views: 2547

Re: '99 F250 Super Duty- immediate low side drop

test conditions are rpm 1500 doors/windows open, fan on high speed set for max cooling. Fords had eractic cycling switches back then. Make sure you have the correct charge in the system.
by Dougflas
Thu Sep 05, 2019 10:38 am
Forum: Automotive Air Conditioning Forum
Topic: '99 F250 Super Duty- immediate low side drop
Replies: 22
Views: 2547

Re: '99 F250 Super Duty- immediate low side drop

quite common. The plastic falls apart and breaks.
by Dougflas
Thu Sep 05, 2019 10:36 am
Forum: Automotive Air Conditioning Forum
Topic: Micron Gauge
Replies: 1
Views: 297

Re: Micron Gauge

yes, you'll be fine.
by Dougflas
Thu Sep 05, 2019 5:07 am
Forum: Automotive Air Conditioning Procedures, Tips and FAQ.
Topic: 1000 MICRONS
Replies: 3
Views: 2508

Re: 1000 MICRONS

This is exactly the reason I state a 30 minute vacuum is useless. As suggested, keep the vacuum going for a longer period of time. You may need to run vacuum for a few hours depending upon how much moisture is in the system and the quality of your equipment. On my own vehicles, I run an overnight va...
by Dougflas
Thu Sep 05, 2019 4:55 am
Forum: Automotive Air Conditioning Forum
Topic: Variable compressor on constant system?
Replies: 5
Views: 694

Re: Variable compressor on constant system?

just put a decent cap on the low side and do not pull the charge just to change a schrader. Schaders are not the sealing but a cap is there for sealing.
by Dougflas
Sun Sep 01, 2019 5:24 pm
Forum: Automotive Air Conditioning Forum
Topic: Running R12 In A R134 System
Replies: 5
Views: 519

Re: Running R12 In A R134 System

philipswanson wrote:What about the expansion valve? Doesn't that need to be changed to run R12? Some valves specify R134.



R12 and R134 are so close I would not change it

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