964 AC leak(s)
06-05-2016, 03:40 PM
#1
Racer
Thread Starter
964 AC leak(s)
What is/are the most common leak(s) in the AC system of a 1990 C2 ?
I did not get cold air anymore and had the car on the AC computer,
the machine sucked out 40 grams of coolant and did a 30 minute
vacuuming, pressurizing , oiling and filling with 840 gram of R132a.
The computer also indicated a leak. After 1 day , cold air stopped
again.
The 964 AC was never a champ but at least some cool air was nice,
any advice would be much appreciated
I did not get cold air anymore and had the car on the AC computer,
the machine sucked out 40 grams of coolant and did a 30 minute
vacuuming, pressurizing , oiling and filling with 840 gram of R132a.
The computer also indicated a leak. After 1 day , cold air stopped
again.
The 964 AC was never a champ but at least some cool air was nice,
any advice would be much appreciated
06-06-2016, 06:57 AM
#4
Although the evaporator is one of the common leakers it might be worth
the effort to look at other points of leakage that can happen.
Have the system re-evacuated and charged but this time have the ac tech
sniff the system with an electronic leak detector:
1) Around the compressor 'service ports', manifold, front and rear case seams, clutch.
2) Two rubber sections of refrigerant lines in the engine compartment.
3) Hose connections for above in the LH rear end.
4) Front condenser and its hose connections.
5) Receiver drier
6) Expansion valve
7) Evaporator box condensation drain
8) AC vents in the car
For most of the 'sniffs', engine needs to be running, compressor clutch engaged.
Some prefer to use a dye and light however that is only helpful if you can see the joint completely.
If it ends up being the evaporator at least you will know you don't have to chase any other items.
the effort to look at other points of leakage that can happen.
Have the system re-evacuated and charged but this time have the ac tech
sniff the system with an electronic leak detector:
1) Around the compressor 'service ports', manifold, front and rear case seams, clutch.
2) Two rubber sections of refrigerant lines in the engine compartment.
3) Hose connections for above in the LH rear end.
4) Front condenser and its hose connections.
5) Receiver drier
6) Expansion valve
7) Evaporator box condensation drain
8) AC vents in the car
For most of the 'sniffs', engine needs to be running, compressor clutch engaged.
Some prefer to use a dye and light however that is only helpful if you can see the joint completely.
If it ends up being the evaporator at least you will know you don't have to chase any other items.
06-06-2016, 12:41 PM
#6
Three Wheelin'
If it looses all of its charge in one day, it's a big leak !!
FYI, I had a leak in the evaporator and replaced it with one from Griffiths (yes, the poster above) and can highly recommend it !
Refilled with R12 which is still available and the system cools beautifully !
FYI, I had a leak in the evaporator and replaced it with one from Griffiths (yes, the poster above) and can highly recommend it !
Refilled with R12 which is still available and the system cools beautifully !
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06-06-2016, 01:36 PM
#8
Burning Brakes
I had a cracked expansion valve, and then my shop found leaking o-rings at the compressor and the condenser, as I recall. Monitoring at this point to see how quickly or slowly we lose refridgerant. But everyone's ultimate fear is the evaporator. : )
