Automotive Air Conditioning Information Forum (Archives)
What's wrong ? Seems I pull vacuum in just a few minutes.
Pancho on 
Mon August 29, 2011 9:16 PM 
What's wrong ?
Seems I pull vacuum in just a few minutes.
Seems to take everyone else about 30 minutes.
Am I doing something wrong on the vacuum pulling thing?
Then, takes about 1 Hr. for vehicle to lose all vacuum.
So, I guess next thing in insert some dye, the use ultraviolet light to locate leak ?
Is this how?
1. Put in a can or regular 134a, then
2. add a can of 134a with dye, then
3 more regular 134a until full, then
4. when it all leaks out, look for leaks with UV penlight and yellow glasses ?
Is this the way it goes, or what ?
Does it make any difference in what order I put in the dye or regular 134a ?
Have Harbor Freight gauges and hoses; and 2.5 Vacuum pump.
Would really like a little guidance here.
Car: Year 2000 Mercedes CLK430, lotsa miles.
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Bought an old Mercedes, whooo! Year 2000 CLK430 Cabriolet --Lotsa miles.
HECAT on Tue August 30, 2011 9:40 AM
It is normal for the vacuum pump to pull into vacuum quickly. It is recommended to pull a sustained vacuum for a minimum of 30 minutes (longer is better) to allow for the unwanted to be removed. You will need to charge it up and run it to find the leak with dye; recover, fix the leak, pull vacuum, and recharge again.
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HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.
FLUSHING TECHNICAL PAPER vs2.pdfÃÂ
mk378 on Tue August 30, 2011 10:23 AM
Harbor Freight gauges have trouble coupling to the car correctly and also they could leak. Leak test your manifold alone not connected to the car.
If it is the car leaking, that's a big leak. You might consider a pressure test with a small amount of R-134a instead of wasting a full charge. Check for leaks with an electronic leak detector or soap bubbles.
To install a dye from a can of R-134a with dye, use that can first into a vaccum because you'll have to hold the can upside down and charge it as liquid so the dye doesn't just stay in the bottom of the can. Charging as liquid must be done with the engine off.
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