What are the normal things to look for to troubleshoot an A/C system? I do not have much experience with A/C's. I do not hear the compressor kick on, and it is blowing hot air. I know the fans should be on but both of them at the same time as soon as I turn the A/C on? I was thinking it's not the freon because it will lose its cooling over time not all of a sudden not work right?
View 24 RepliesI have a MKIV R32 and the other day I was driving with the A/C on, blowing cold air when randomly the air turned hot and hasn't blown cold yet. I took a look at the refrigerant levels today and they show a full charge along with the low-side refrigerant tube to the compressor getting cold but no still no luck.
The compressor is on so I don't think that's at fault, what else could there be? Something electrical maybe?
I have a 2000 Jetta that doesn't blow cold AC. Here are the details:
- When the AC is turned on, air does blow through the vents. Each setting (1-4) does blow harder than the previous.
- Both front fans spin and are working
- The AC compressor clutch never engages
- All fuses (two inside the car and the one above the battery) have been replaced and test good.
- When the AC is on full blast, the voltage coming from the AC compressor wire shows ~9.3V for about 5 seconds, then jumps up to about ~11V for less than a second, this repeats over and over and the clutch never engages.
What the next logical troubleshooting step would be? I've read about this possibly being the fan control module (maybe) and also read about testing the AC compressor using an external 12V power supply, but am not sure where to go from here.
02 JettaVr6 auto tranny- car was running perfect, no CEL. Now all of a sudden the fuse keeps blowing out- what exactly is running off this fuse?
View 1 RepliesI have a mk4 gli and the a/c is not blowing cold, or remotely cool. When I turn on the a/c the engine drops rpm's like it is engaging, or whatever, but doesn't get cold. I checked under the hook and it sounds like something is trying to come on every 10 seconds or so...it's like the engine jumps or something. The fan on the passenger side is coming on if that means anything but the driver side doesn't when a/c is turned on.
View 4 Replies'01 Jetta IV GLS AC not blowing cold air:
1. Blower works on all 1,2,3,4 settings
2. Cabin Air Filter Clean
3. When AC button pressed, I see the Compressor turns and noted the clutch also engaged.
4. AC Fan near Radiator comes on
5. Blend Door seems to be working fine - fixed the problem of spitting foam without opening up the heater box.
6. Since the above electrical parts seem to be working, I suppose it could not be a relay issue.
having the issue where there aircon refuses to work even if the system is gassed up and leak free, and the compressor seems to be functional but not powering up. Before spending loads of cash on controller units, swtiches etc, your problem might be a dodgy connector under the battery tray.
As I have bought another Golf that appeared to have this issue, I took some photos this evening while I fixed it, hopefully this will be of use to people?
To start with, I had a look at my old Golf, which I knew had already been repaired. under the battery tray I found the repair. I put new tape on as the old tape was showing its age, so it shows up quite nicely - it's the blue tape!:
and a bit of a close up:
So now I knew what I was looking for, I had a look at my new Golf:
Which, I cut out, soldered the ends together, heat-shrink wrapped, then covered with some more trusty blue tape and zip tied it all up to try to minimise further chafing (the blue tape on the left is another part of the loom that looked like it needed a bit of tidying up):
A drive around this evening shows the aircon is now blowing a lot colder than before (previously it was blowing hot air after 5 minutes). I'll be testing it properly on a hot day, but I'm 90% certain I've nailed it.
I am trying to narrow down what could be the issue to my 2002 vw Jetta VR6 air conditioning. It is blowing air but the air is not cold. If I need to add refrigerant, where I can find the low pressure valve so I can do this on my own with one of those store bought cans.
View 2 RepliesFirst of all, its not a faulty brake light switch. I just found out that my rear brake lights have been out. I went to check the fuse and it was blown. I've replaced it but the second i touch the brake pedal, it pops again. Things I've tried...
I checked the wiring for any exposed wiring and i didn't find anything.
I disconnected the entire light assembly from the connectors on both sides and the fuse still blew.
I'm suspecting a bad ground, (as there was a point when the lights would work, even when i touched the pedal, but as soon as i pop the trunk open, the fuse would blow.
Where the lights are grounded? Is there anything else i should check?
Pics for views....
This morning my AC was working just fine, air blew cold and nothing seemed wrong. But then tonight when I went out it was cold outside so I decided to turn the heat on.. That's when a problem happened. Tried turning the AC on but no air came out the vents at all. Tried all the air settings, nothing at all, even when it's on "4". The only thing that seems to work is the re-cycilation button, it lights up and I can hear it working. So to sum it up, no air coming out the vents and the AC light won't turn on when I push it in.
View 3 RepliesNo AC... Its not the fuse box on top of the battery, I recently already changed that. The air coming out is not cold at all, so I checked the pressure, and it was even higher then it was supposed to. After letting some pressure out, still no cold air. What could the issue be? Should I maybe bleed the system?
Also, its a 2001 GLX so I have climatronic....
I bought a 2002 gti mk4 with about 127000 miles on it .I did not know the turbo fans were blown out , they were sitting in my down pipe next to my catalytic converter . So I replaced the turbo myself , and 2 hours later the fans fell out of the new turbo , what might be the problem ? why it keeps blowing.
View 7 RepliesWell its a 1.8t pretty much stock except the previous owner added a turbo-back exhaust and has an apr tune running the 91/93 octane tune and they also deleted the stock airbox.
After the car warms up sometimes I'll get a pretty big puff of smoke on acceleration from a stop. sort of bluish in color and it happens randomly, not every time. I usually have to add oil about every week. I have taken it to a mechanic but told me it wasnt the turbo ( cause thats what i thought at first) and that it might be valve seals instead. I scanned for codes since CEL went on and i got a p0136 o2 sensor code and p0411.
My turbo started to have oil on the top of it. I don't know where it's coming from at all, it started to blow blue smoke but not all the time. You can also smell the oil burning off.. someone said maybe the pcv system but not sure. Still new to the vw world only owned the car for about 4 months. Trying to add pics but it's not working.. Will keep trying
View 3 RepliesMy ac stopped blowing cold. The compressor turns on when I turn the ac on. When I pressure tested the low line port, it showed it was too high to add any recharge. 2001 jetta wolfsburg 1.8t....
View 2 RepliesI just purchased a 2004 Golf 2.0 for my daughter. The car seems to be in good shape but it does have a few problems being used and 153k miles on it.
1 - a/c switch doesn't light up and the blower does not come on. No airflow thru the vents at all. I Googled this and it sounds like blower motor and/or resistor?
2 - when using key remote to lock doors the right side marker light sometimes stays on. I have to hit the lock/unlock 4-5 times for it to go out. Is this short?
3- Front left wheel bearing was replaced but the previous owner just did that one side. The front is making noise so I plan to do the right ASAP.
Anything else I should be watching for?
I had an 85 Golf - one of my favorite cars, bought this in the hopes this one would be as good to my daughter.
The AC on my car (2002 Jetta 1.8t) quit blowing cold. Did some troubleshooting and...
1. Checked Freon- level was ok
2. Noticed cooling fans were not coming on with AC button pressed and ignition on. Fans also not coming on when car up to temperature, but gauge never went above normal. Seems strange considering I live in Houston and it was 95+ out.
3. tested fans with direct power and both high and low are fine.
4. jumped terminals 1,2 and 2,3 on plug for cooling fan switch and fans turn on high and low...so thought must be bad cooling fan switch.
5. Replaced cooling fan switch and still no fans or ac when AC button is pressed and ignition on.
6. replaced Fan control module. Still no fans.
7. Checked Freon once more...and although it was in the ok range decided to add a little more. (was in the middle of ok range, and a cheap gauge)
8. Compressor kicks on, along with cooling fan. End up using the 1 can I had and now have cold air and fans that come on when hitting the AC button with ignition set to on position.
I thought the mkiv cars would always turn on the fans when AC button is pressed with ignition on? Or does the compressor also need to be charged?
So my alternator went bad last week so I replaced it. Tested it yesterday and it was charging fine and drove it to work. I got the esp light on after driving 10 miles everytime I start it. So I go start it and it turns over slow but starts. Before I got to a friends house I was getting on it from a stop pretty hard and noticed the ac stopped blowing cold air. I go to leave a few hours later and it barely turns over and died shortly after moving. Took a while to jump it and the battery light blinked the whole way home. THEN, I go inside and hear something about 5 minutes later and my stereo is on! Also ABS light is on. Could a dead battery do all this?
View 1 Replies2003 Jetta TDI GLI , fuse number 32 (30 amp fuse) keeps blowing immediately after I replace it. I can't start my car because of it. I do have a shorting head light and the glow plug indicator flashes with the check engine light on. This doesn't happen all the time. When it does happen, sometimes the accelerator will not work and instead of idling at ~900 rpm it idles at ~1100 rpm. I usually just restart my car and then it works again. Not sure how these issues are related but I can't start my car because of this blowing fuse.
View 2 Replies99 Jetta VR6... 190k
So the heat doesn't really work on my car- and its getting cold outside.
I read the DIY on fixing the resistor pack, but there is a lot of hooptiness to my ride, (not sure if that's the issue).
All the fan control speeds work, but the most I ever get is vaguely warm air- it never gets fully hot.
The temperature gauge does not work most of the time- it does occasionally (but randomly) work as expected.
The defrost doesn't work either due to an issue with the AC (it keeps blowing the fuse for the AC compressor- like, right away)
There's a multitude of issues happening here I know, but need to narrow down the suspects for the heat, that would be very useful.
I have a 2002 GTI 1.8T with the AWP engine and tiptronic. There is a fuse in the picture below that blows as soon as the car is started. It is located next to the brake booster on the firewall. It does not blow when the ignition is turned on, just when the engine actually starts. I'm not throwing a check engine light, pulling a scanner code or noticing any of my electronics not working. I took a 20 AMP fuse out and replaced with another 20.....and have since blown 5 of them trying to diagnose the problem.
View 10 Replies