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TRB on Thu April 02, 2009 11:08 AM User is offlineView users profile

COMPRESSOR DRIVE BELT MAINTENANCE... There are several factors that have major effects on compressor drive belt life expectancy and reliability. Belt alignment and proper tension are the two most critical and controllable by the installer and end user. When improperly installed or maintained drive belts can cause significant damage to the compressor and clutch and other components as well as pose a safety issue.

Ounce of Prevention...
Never use compressed "shop" air to leak or pressure test an A/C System. Under certain conditions, pressurized mixtures of R134a and air are combustible. In addition shop air will inject excess moisture into the system.


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Z2TT on Fri February 22, 2013 6:00 PM User is offline

I think R134a when compressed with Air has some sort of reaction which is what drives high side pressures up when system is not vacuumed out.
Seems to only happen with pressure though, e.g Air+R134a can Co-exist without a problem but when pressurized from what I heard causes some sort of reaction.

Is there any more information to this?

Edited: Fri February 22, 2013 at 6:01 PM by Z2TT

WyrTwister on Sat July 20, 2013 6:33 AM User is offlineView users profile

Quote
Originally posted by: TRB
COMPRESSOR DRIVE BELT MAINTENANCE... There are several factors that have major effects on compressor drive belt life expectancy and reliability. Belt alignment and proper tension are the two most critical and controllable by the installer and end user. When improperly installed or maintained drive belts can cause significant damage to the compressor and clutch and other components as well as pose a safety issue.



Ounce of Prevention...

Never use compressed "shop" air to leak or pressure test an A/C System. Under certain conditions, pressurized mixtures of R134a and air are combustible. In addition shop air will inject excess moisture into the system.

Luckily , at least with the 1990's generation GM's I own and maintain , the serpentine belt does not seem to have much problem with alignment . And the spring powered / tensioned idler pulley does a good job of maintaining belt tension .

God bless
Wyr

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