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Thread: AC Question
06-15-2010 08:23 AM #1
Running down the road AC flows cool. Stop at a light and it warms up; not hot but a humid cool. Press the gas to around 1K RPM and cool flows again. Replaced the evaporator last year.
I purchased one of those cans of refrigerant with a gage on it and the gage says around 45 psi pressure. This is yellow and indicates possible over pressure. So I put it on the wifeís car (no AC problems) and it reads around the same. I guess there probably isn't a leak.
06-16-2010 06:29 PM #2
Re: AC Question
I just replaced the AC compressor, dryer, and expansion valve in my 2001 Chrysler minivan (my daughter is driving my Z3) so I have some experience with no AC in St. Pete.
Your description suggests that the evaporator isn't being cooled unless the car is moving. Check the radiator cooling fan at idle and verify that it is coming on. Mine wouldn't come on until I disconnected the sensor on the high pressure switch and reconnected it again. That was before I found out that my AC compressor was out of oil and wouldn't cycle on so I had to replace it.
06-17-2010 08:55 AM #3
06-18-2010 12:15 AM #4
- Fairfield, CA,Member No: 165830
- Join Date
- Jun 2008
- Rep Power
06-18-2010 11:39 AM #5
- Tampa, FL, United StatesMember No: 16681
- Join Date
- Oct 2001
- Rep Power
06-18-2010 01:39 PM #6
06-20-2010 09:33 PM #7
Mine is doing this as well. It had a slow leak, which has gotten worse. This year when I took it out of storage there was zero pressure in it. I have been recharging it annually for three years now, but I think there is air in the system now, so it is not running properly. It cools at speed, but not much at idle, and the aux fan is running.
I think I need to take it to an A/C shop, have them pump it down and then recharge it, possibly install a new receiver/dryer (which sucks up moisture and contaminants) and maybe find the leak (lets hope it isn't behind the dash board).
Finding a good A/C shop that works on BMWs. That should be fun.
06-21-2010 08:21 AM #8
06-21-2010 06:37 PM #9
06-22-2010 08:20 AM #10
07-29-2010 02:21 PM #11
I took the M Roadster to a local shop to see if they could find the leak. It has been using a can of refrigerant every year, and this year the pressure was ZERO when I took it out of storage.
They put in a new condenser and filter/dryer ($500 with labor, not bad considering retail on the condenser is $500).
It works OK - above 2000 rpm. On the road, it works fine, but at lower speeds or when stopped, it isn't as cool.
I am going to check the aux fan again, as well as the coolant level. But recollection has been that the Z3 A/C has never been that strong, and on 100 degree days down here in Georgia, it it near its limit.
Any suggestions or ideas are welcomed....
07-29-2010 02:23 PM #12
07-29-2010 08:35 PM #13
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