Search found 428 matches

by bohica2xo
Wed Jul 18, 2018 1:29 pm
Forum: Automotive Air Conditioning Forum
Topic: Challenger Tractor A/C Problems...
Replies: 5
Views: 65

Re: Challenger Tractor A/C Problems...

Your compressor will be fine at those modest high side pressures. As a rule of thumb, when the high side P/T ratio goes much past 3:1 things are not well. Here in the desert when the ambient goes to 125f, you can see 375 psi on the high side. Sounds like you have enough condenser & airflow to ke...
by bohica2xo
Tue Jul 17, 2018 3:43 pm
Forum: Automotive Air Conditioning Forum
Topic: Working on fire engine AC (again)
Replies: 23
Views: 417

Re: Working on fire engine AC (again)

There it is. The wrong TXV.

The CV on the parker valve is about twice that of the 4 seasons replacement.

Twice as much refrigerant mass per minute in to the evaporator.
by bohica2xo
Mon Jul 16, 2018 5:57 pm
Forum: Automotive Air Conditioning Forum
Topic: C5 Covette AC questions
Replies: 43
Views: 350

Re: C5 Covette AC questions

Microns allow you to spread the scale somewhat...

https://www.engineeringtoolbox.com/vacuum-converter-d_460.html

Anyplace between 400 & 1000 microns is great for automotive work. For rigid plumbed stationary systems you can go lower.
by bohica2xo
Mon Jul 16, 2018 4:02 pm
Forum: Automotive Air Conditioning Forum
Topic: C5 Covette AC questions
Replies: 43
Views: 350

Re: C5 Covette AC questions

Check all of your service hose connections. A tiny leak in any of the 4 temporary connections or a handwheel valve stem can be enough. If you suspect a connection, disconnect the high side at the vehicle, pull again & see if the vacuum holds. Try the same test in reverse. If you get the same lea...
by bohica2xo
Mon Jul 16, 2018 2:28 pm
Forum: Automotive Air Conditioning Forum
Topic: C5 Covette AC questions
Replies: 43
Views: 350

Re: C5 Covette AC questions

On the second pull, let the pump run for 15 minutes after the lowest reading is reached. Close both handwheels, shut the pump down & note the gauge reading. Let it stand an hour & re-check the reading. if it has dropped measurably, let it stand for several hours & see if it continues to ...
by bohica2xo
Sun Jul 15, 2018 8:34 pm
Forum: Automotive Air Conditioning Forum
Topic: Floating RPM when AC on
Replies: 3
Views: 65

Re: Floating RPM when AC on

Not an A/C problem.

Engine idle speed is controlled by the ECM. Take it to BMW & have them read the codes, something is not functioning properly in the engine controls.

Is this car located in the USA?
by bohica2xo
Sun Jul 15, 2018 4:47 pm
Forum: Automotive Air Conditioning Forum
Topic: Working on fire engine AC (again)
Replies: 23
Views: 417

Re: Working on fire engine AC (again)

The compressor on that truck easily makes 15,000 btu/h by 3000 compressor shaft RPM. It is a 323 cc/rev unit. That valve is for a 1978-85 Porsche 928. An R12 car with a little Nippondenso 6E171 compressor. That valve also crosses to Dodge K car, Renault LeCar Dodge mini vans... Nothing with big syst...
by bohica2xo
Sat Jul 14, 2018 8:58 am
Forum: Automotive Air Conditioning Forum
Topic: Working on fire engine AC (again)
Replies: 23
Views: 417

Re: Working on fire engine AC (again)

Wow. I would have expected a larger valve with that large of a system. That is a replacement valve for a 924 Porsche. Backing it out reduces seat pressure, and increases refrigerant flow. The diaphragm motor only has so much stroke. You could put that disassembled valve body in the freezer to see it...
by bohica2xo
Sat Jul 14, 2018 8:37 am
Forum: Automotive Air Conditioning Forum
Topic: Airflow problem on '96 explorer
Replies: 5
Views: 56

Re: Airflow problem on '96 explorer

Modern cars don't overheat with completely dead fan clutches, but the condenser airflow takes a big hit. Yes, you need to have the full charge in a system to evaluate it. Your high side reading is low, but that could be low charge or poor compressor performance. Fan clutches wear out. Sometimes afte...
by bohica2xo
Sat Jul 14, 2018 7:12 am
Forum: Automotive Air Conditioning Forum
Topic: Missing fitting can’t find it anywhere please help
Replies: 4
Views: 57

Re: Missing fitting can’t find it anywhere please help

See the steel nut on the end of the hose? That should screw right on the end of your dryer.

The whole stack of brass fittings was just a pair of dry break couplers. Eliminate the whole thing & screw the hose right on the dryer.

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