NewBeetle.org Forums banner

1 - 6 of 6 Posts

·
Registered
Joined
·
7 Posts
Discussion Starter #1
I'm stumped with a problem on my 2000 VW New Beetle. 2.0 non-diesel.

AC was working fine last year. This year the AC started blowing ambient air. I had it recharged, twice. I checked the fuses on top of the battery, no signs of melting, and the fuses in the cabin are all fine. However, when I pull fuse 16 the fans kick on automatically.

I have now changed the fan control switch with a brand new one.

I have now changed the radiator cooling fans, with aftermarket fans. Prior to changing the fans the old fans did not come on when I turned the key to the on position and engaged the AC. The smaller (passenger side fan) was black on the inside when I removed it, and the larger (driver side fan) was squeaking terribly bad. I opted to replace them.

After replacing all of these, the cabin became cool as I sat and Idled the car (AC seemed to be working). However, when I drive, the compressor engages, blows a small amount of cold air (a burst 30 seconds or so) and then ambient air.

I couldn't find any thing on the forums about this type of problem, however the dude at Autozone said that it was the AC expansion valve.

At this point I've spent a ton of time and $$'s trying to track down a problem that may not have been caused by prior replacements and I need a proper diagnosis. The fan diagnosis came from the dealership and was reaffirmed in the forums.

Any clue what could be causing this? Forums that I have referenced include:

http://newbeetle.org/forums/questions-issues-concerns-problems-new-beetle/37302-c-recharging.html

http://newbeetle.org/forums/2-0-liter-gas/37038-sucessful-ac-compressor-diy.html

01 Jetta, Wierd a/c charging problem. - TDIClub Forums

A/C Compressor Refrigerant Control Valve - TDIClub Forums

VWVortex.com - a/c not working, diagnostic steps?

VWVortex.com - A/C blowing hot air

Ac issues on a 99 beetle - Volkswagen Forum - VW Forums for Volkwagen enthusiasts

VWVortex.com - DIY - MKIV GTI, Golf, Jetta Compressor, TXV, Dryer

http://newbeetle.org/forums/2-0-liter-gas/30129-air-conditioning-saga.html

No Compressor Operation in Volkswagen New Beetle

http://newbeetle.org/forums/2-0-liter-gas/49932-c-compressor-wont-kick.html

http://newbeetle.org/forums/2-0-liter-gas/36064-2000-new-beetle.html

Check your radiator/condenser fan operation NOW - TDIClub Forums

http://newbeetle.org/forums/questio...s-coming-here-check-your-fans.html#post651485

http://newbeetle.org/forums/2-0-liter-gas/51483-beetle-wiring-diagram-fix-c-fan.html
 

·
No NB Yellow Trifecta :(
Joined
·
5,639 Posts
Off the top of my head, any one of or a combination of ... if you have one, the valve on the passenger side firewall, the drier or compressor.
 

·
Registered
Joined
·
7 Posts
Discussion Starter #4
I opted to change the thermal cut out switch. $9.00 from Autozone and an easy fix. I'm sure mine needed changed, however, there was no change in the AC system.

I also had a local shop throw dual AC gauges on the AC to measure the low and high side pressure. The low side was 45 and the high side was 500. After about 45 seconds the low side jumped between 65-100. The local mechanic admitted defeat and suggested taking it to an AC specialist. He noted that he had never seen that happen and that the pressures were off.
 

·
Registered
Joined
·
7 Posts
Discussion Starter #5
**Update**

I was able to locate the parts that I needed to change the expansion valve and the drier on the AC system. I opted not to change the compressor because the clutch is engaging and working properly. Tests and visuals can be found on this post: http://newbeetle.org/forums/2-0-liter-gas/36064-2000-new-beetle.html

The guys at the shop where I've had it charged twice vacuumed the system out free of charge and replaced the r134 when I was done changing the parts. I showed up with some McDoubles and Sweet Teas during the second charge (on an exceptionally hot day) and they remembered that). I fed them again while they were re-charging after I changed the parts. Don't underestimate the power of the McDouble.

As such I changed the expansion valve, and the drier (because the system was open and I don't think it had ever been changed) both parts from Auto zone cost $75.00. Simple Alan wrenches were required to remove the expansion valve. The part came with 4 o-rings. The dryer was in place with Lock-tight so I had to use an impact ratchet to remove the screws. Pretty straight forward removal and replacement. I am not a mechanic and had never done this before. Time from start to finish was an 1.5 hours.

Problem fixed! I now have cold air. I think there were numerous problems (fans, fan control switch, thermal sensor) which contributed to the problem. But the last problem I'm certain was the expansion valve.
 
1 - 6 of 6 Posts
Top