Bad AC evap?
#16
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Thread Starter
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I am going thro this, mine went from blowing cold to blowing warm in a few days. Became a winter project, here was my list:
1 - Buy AC hoses and check pressures per the 993 manual/posts here. Mine were both at zero.
2 - I chose to pull a vacuum and a rise test showed a decent leak present.(sounds obvious I know, but I'd just put the engine back in and had a recharge done. I was comfirming whether the recharge had been done, or if there was a leak.).
3 - Tracer gas sniffing narrowed the area down to the evaporator / suitcase. (Stick into cabin vents = signal rise, then you can stick down the front of the suitcase = I saw significant rise).
4- Dye was injected during last refrigerent charge so I'm going to pull the tank and see what is what.
AC hoses are useful, if you want to get good results. Not expensive either.
1 - Buy AC hoses and check pressures per the 993 manual/posts here. Mine were both at zero.
2 - I chose to pull a vacuum and a rise test showed a decent leak present.(sounds obvious I know, but I'd just put the engine back in and had a recharge done. I was comfirming whether the recharge had been done, or if there was a leak.).
3 - Tracer gas sniffing narrowed the area down to the evaporator / suitcase. (Stick into cabin vents = signal rise, then you can stick down the front of the suitcase = I saw significant rise).
4- Dye was injected during last refrigerent charge so I'm going to pull the tank and see what is what.
AC hoses are useful, if you want to get good results. Not expensive either.
#17
Instructor
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A leak was detected in my A/C evaporator. Assuming that the installation process is the same, which evaporator is recommended Behr or Griffiths, and why.
Thank you
Thank you
#18
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I had this problem in my car.
Recharge worked, after abou2 weeks did not blow cold
Repair was pricey @ $3,200 - aft6ermarket part was @ $900, rest was labor.
Old part showed corrosion at the bottom of the codensor.
Recharge worked, after abou2 weeks did not blow cold
Repair was pricey @ $3,200 - aft6ermarket part was @ $900, rest was labor.
Old part showed corrosion at the bottom of the codensor.
#19
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So I'm going to pull the gas tank.
Then I will replace the evaporator with an upgraded (i.e. Griffiths) even if that is not the actual leak point - may as well and it looks like the Griffiths is higher quality than oem. I usually stick to oem but here I feel it is a worthwhile and invisible upgrade. Certainly hope I wont have to pull the gas tank too many more times in the future...
#20
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Then I will replace the evaporator with an upgraded (i.e. Griffiths) even if that is not the actual leak point - may as well and it looks like the Griffiths is higher quality than oem. I usually stick to oem but here I feel it is a worthwhile and invisible upgrade. Certainly hope I wont have to pull the gas tank too many more times in the future...
The Griffiths evaporator is NLA. They told me they won't have their new design ready for a year. They did recommend using an evaporator that did not have copper headers bonded to an aluminum matrix as that is the common failure point (bi-metallic corrosion). That knocks the cheap Behr evaporator out of the running. I did source an all-aluminum evaporator from FVD Brombacher. It's more expensive but probably cheaper in the long run due to the reliability improvement.
Also, I'm replacing all the foam seals in the suitcase and duct work to keep hot air out of the system. New Dansk evaporator fans are replacing the original Bosch fans. I also need a parallel flow condenser, which I sourced from Griffiths (a great advantage to owning a 993 is that it already has the correct condenser and barrier hose for R-134a).
I'd bet a 993 suitcase will need nearly as much attention as my 965 did due to system aging. If you have to have it out of the car and apart, it makes sense to refurbish and replace everything in it.
#22
RL Community Team
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#23
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I replaced my evaporator with a Kuhl about four years ago and AC is working fine. The problem is that everything in the frunk has to be removed, resulting in high labor costs. Mine was around 3k.
#24
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There are foam seals that you have to fabricate but that's the only "skilled" task.
#25
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Cheers