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Forum: Diesel Discussion

04-23-2010, 11:27 AM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

I have two welch two stage pumps. SERIOUS pumps....

I have two welch two stage pumps. SERIOUS pumps. one is a 15CFM model. HUGE! but it pulls down a large chiller in no time!

Forum: Diesel Discussion

04-23-2010, 09:20 AM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

true... a lot of pawn shops have the thermister...

true...
a lot of pawn shops have the thermister led micron gauges.
too bad we can't evacuate, flush and re-evacuate anymore...

Forum: Diesel Discussion

04-23-2010, 08:36 AM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

seriously, if you are getting the mobile a/c...

seriously, if you are getting the mobile a/c system below 1100 microns you are doing very good.

Forum: Diesel Discussion

04-21-2010, 10:11 PM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

... you could always turn it upside down and...

... you could always turn it upside down and drain out the oil from the port you connect the hoses to. you could even pressurize it to force the oil out faster... heck, you should drain out the 3g...

Forum: Diesel Discussion

04-21-2010, 11:43 AM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

oh, there's no question that a piston recip...

oh, there's no question that a piston recip compressor is capable of much better and faster evacuation than a venturi VP is. it's just that without proper gauges, there's no way for someone to know...

Forum: Diesel Discussion

04-20-2010, 11:42 AM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

not if there is a leak. or if significant...

not if there is a leak.
or if significant moisture is present.
or if the vacuum pump is not working properly.
nothing beats a micron vacuum gauge.
best practice is to evacuate to 2000microns,...

Forum: Diesel Discussion

04-19-2010, 11:13 AM

Replies: 42

AC evacuation question

Views: 3,399

Posted By vstech

firstly, checking for leaks with vacuum is...

firstly, checking for leaks with vacuum is foolhardy.
you need to check for leaks with pressure. nitrogen is a good way to test. pump up to 120psi and wait. check next day, if still at 120, you...

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