2.7T - AC - high and low pressure both very high - fan not running - compressor
07-25-2014, 03:26 AM
#11
AudiWorld Senior Member
Thread Starter
If the elctric doesnt come on it will make the a/c system overheat, way to high of high side and kick off the compressor. Fuses, the fan controller on the driver frame rail, fans themselves failed, or wire harness damage. Connectors for the fan are by the steering reservoir. Check a few more things, see if the fan controller has power and ground. if you need wire diagrams im sure i could find them.
I can hard wire (12V) the fan for now (keep running) for the time being so I can have shop suck out and refill the system. Once that is done and checked off, I can tackle the fan wiring/controller. I had a bad controller (different car) in the past, bitch to get to.
07-25-2014, 03:27 AM
#12
AudiWorld Senior Member
Thread Starter
07-25-2014, 03:29 AM
#13
AudiWorld Senior Member
Thread Starter
07-25-2014, 04:07 AM
#14
Refrigerant Pressure and Temperature Chart For R-22, R-410A, R-407C, R-134A, R-404A
07-25-2014, 04:11 AM
#15
If it was open a long enough you probably need to replace the desiccant.
If it ended up with enough water vapor in the system or if you charged it to the point it pulled significant liquid into the low side of the compressor, you might be looking at a new compressor (now or soon).
If it ended up with enough water vapor in the system or if you charged it to the point it pulled significant liquid into the low side of the compressor, you might be looking at a new compressor (now or soon).
07-25-2014, 04:47 AM
#16
AudiWorld Senior Member
Thread Starter
If it was open a long enough you probably need to replace the desiccant.
If it ended up with enough water vapor in the system or if you charged it to the point it pulled significant liquid into the low side of the compressor, you might be looking at a new compressor (now or soon).
If it ended up with enough water vapor in the system or if you charged it to the point it pulled significant liquid into the low side of the compressor, you might be looking at a new compressor (now or soon).
It was open a long time (weeks), yes.
How to replace 'desiccant'?
07-25-2014, 05:00 AM
#17
(Will only lean the hard way and hoping not to.)
Usually if you can trace the refrigerant lines you get to a can (the "Dryer"). It is filled with desiccant. Some open and the internal bag can be changed, other you have to change the whole piece.
Some cars have it in the or as part of the condenser.
If you did not vacuum down the system you left a lot of air mixed with the refrigerant.
I would go to a good independent AC shop.
07-25-2014, 05:12 AM
#18
AudiWorld Senior Member
Thread Starter
Usually if you can trace the refrigerant lines you get to a can (the "Dryer"). It is filled with desiccant. Some open and the internal bag can be changed, other you have to change the whole piece.
Some cars have it in the or as part of the condenser.
If you did not vacuum down the system you left a lot of air mixed with the refrigerant.
I would go to a good independent AC shop.
Some cars have it in the or as part of the condenser.
If you did not vacuum down the system you left a lot of air mixed with the refrigerant.
I would go to a good independent AC shop.
Will also hard wire the fan to avoid giving them a reason to say "we tried but doesn't work since fan is not running".
07-25-2014, 05:56 AM
#19
I just want to get the basic troubleshooting done before heading to the local shop for a 'suck and charge'. They are no Audi experts (knowing from past experience with 1996 A4 2.8, where they could not do the service due to first not finding low pressure connector, then not having the adapter required for those older A4).
Will also hard wire the fan to avoid giving them a reason to say "we tried but doesn't work since fan is not running".
Will also hard wire the fan to avoid giving them a reason to say "we tried but doesn't work since fan is not running".
I did say a "GOOD" AC shop.
I am spoiled, I found a guy who really knows his stuff when I had to have an old Range Rover sorted out/ Have used him ever since (wish he did home AC work)
07-25-2014, 08:43 AM
#20
AudiWorld Super User
Not only air mixed with refrigerant but a lot of water vapor that was in the air. That causes internal icing in the system at the expansion valve as well as potential corrosion in the compressor…water not good.
Your entire system should be flushed with nitrogen and pressure checked for leaks, the receiver/dryer (not possible to replace bag) replaced, system vacuumed, and recharged by weight of R134 including replacement of compressor lubricant.
ECS tuning has aftermarket receiver dryer for about $35 or so, the OEM costs about $200! Plug in your engine, etc., and watch for the 1998 VIN break…you might want to call them.
Audi B5 A4 Quattro V6 12v Climate Control Air Conditioning Receiver / Drier - 8A0820193AB - A/C Receiver/Drier - ES#2075194
Your entire system should be flushed with nitrogen and pressure checked for leaks, the receiver/dryer (not possible to replace bag) replaced, system vacuumed, and recharged by weight of R134 including replacement of compressor lubricant.
ECS tuning has aftermarket receiver dryer for about $35 or so, the OEM costs about $200! Plug in your engine, etc., and watch for the 1998 VIN break…you might want to call them.
Audi B5 A4 Quattro V6 12v Climate Control Air Conditioning Receiver / Drier - 8A0820193AB - A/C Receiver/Drier - ES#2075194
Last edited by SloopJohnB@mac.com; 07-25-2014 at 08:47 AM.
