abiazis

Not an expert with AC..........Recharged my AC and Porsche dealer reported that there were no leaks as they ran the dye in the system......now blowing semi-cool air, but not cold as after the recharge.........would evaporator be best place to start checking?

KNS

They may have put dye in the system but did they check everywhere? The evap is hard to get to (and check for leaks). If they didn't check every single possible source for leaks then they might not have seen a potential leak.

ToreB

I would start with the evaporator, this is known weak spot in the 993 A/C system. If you have dye in the system, you should check for this at the evaporator drain opening under the car, between the front wheels. See the flat rubber hose opening in the pic.

If your A/C technician have a electronic sniffer, they could start with the evap, reachable through the resirc flap opening under the dash.
Cheers,
Tore

griffiths

Dye tracer for leaks is always limited to visibility; what you can see vs. what you can't. Best method is an electronic leak detector.

Visually (dye and black light, soap and water or residual oil), you can look at:
Compressor hose fittings, manifold, comp case seals, service ports,
rear bulkhead connections,
front condenser hose fittings and base of condenser (corrosion),
drier fittings,
TEV (expansion valve fittings).
In some case you may need to remove a panel.

Electronic leak detector (corona-suppression, heated-diode or infrared, ultrasonic type has limitations), used when the system is charged and running:
sniff every component joint,
for evaporator you sniff the vents and condensation drain tube.

pp000830

Check the air duct valves in your footwells. If they don't close fully warm are is may be mixing with the cool before it gets out of the dash. If you run the OBDC codes a bad one usually shows up. Also, verify the vacuum actuated one in the engine compartment if you have a Verioram engine. If you use a thermometer you can check the temp drop on each side of the system to see if it is efficiency or a hot air leak.

95_993

Good indicator here is warmer air coming out of the far right or left vent. I had one stick awhile back.

abiazis

Thanks for the advice......$2K repair I guess is in order due to fuel tank drop, etc....