Golf IV / Jetta IV :: Air Condition Is Not Blowing Cold
Mar 16, 2016
I 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.
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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.
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'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.
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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.
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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.
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No 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....
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My 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....
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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?
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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?
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My car has been in and out of my mechanics with no resolution to my problem.
When I press my AC button, a number of warning dashboard lights on my dashboard turn on, check engine, oil pressure, abs, air bag (pretty sure all of them). Each time this happens, I have my mechanic clear the warning lights in my dash. And no, the AC does not turn on.
I don't have any warning lights on my dash, and driving the car without pressing the AC button for weeks doesn't trigger any warnings. Once the AC is pressed, I get almost all of them, within a minute. The codes that his computer read are failure to communicate signals.
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I have a 2005 VOLVO TRACTOR, Autoshift, Cummins ISX. Recently the Dashboard only works at "cold" condition, after 5~20 minutes of starting the engine, the information Display shows up: check lights control module, check vehicle ECU, check air bag, check climate module, finally show "check datalink". Speedmetre, RPM, oil pressure, water temperature gauges and gear position are all dead, only Fuel, Air, Pressure and Turbo gauges work. We have replaced new dashboard, but nothing changed. And we checked J1939 communication wire OHMS is 60 at either back of dashboard plugs and data link. All modules are working good except information module. When dash was out, we did connect the laptop via datalink. We could communicate with ECU normally. The problem looks like the dashboard is so sensitive and easily quits working. We had checked batteries and main ground cables and all fuses. We did the test, after removing all lights control module fuses, ABS module fuse, climate fuse etc., the dashboard sometimes works
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A friend of a friend has a 1990 Escort 1.9L automatic with a TBI setup. It has a random no-start condition that only seems to act up when its cold outside (below 20 F). I've only seen it act up once with minimal testing equipment, so I'm digging for answers.
The injector fires normally and flooring the pedal goes into clear-flood mode as it should. It has spark, but sounds out of time. It will attempt to fire unless the pedal is floored long enough to take fuel away. Starting fluid in addition to the fuel makes minimal difference, but results in intake backfires when you stop cranking. After a random amount of cranking, it will eventually fire and then the issue goes away completely.
Once it fired, I was able to shut it down and restart it indefinitely with no hesitation. While running, it shown no signs of being out of time, vacuum leaks, etc. I have very little experience with the EEC system, but friends suggest a TFI module. A weak or mistimed spark seems to be the cause, but I'd like a second opinion. I shook and moved every wire I could find and checked the TFI pins for corrosion - no change.
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Today I got in the car and turned on the ac, got no air blowing. Turned the ac off and the heat up, still nothing. I assume the blower is shot or maybe the fuse? I could hear the vents switching from top to bottom as I changed it but no air coming out. Where would the fuse be? What to check? Engine cooling fans replaced last year and working.
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This is on a 06 GTI. Yesterday my AC just stopped blowing cold. I checked the fuses did not find any that were bad. Belts are new, compressor is spinning, not sure if the clutch is engaging, can't hear anything clicking etc. Upon further investigation it is doing some weird stuff. Fan speed works fine, blows air but no cold air however if I try and get hot air (the heater) there is no change in air temp. If I turn the "ECON" button on and off no change. If I turn on the front defrost then I get Hot air but that is the only way I can get any temp change hot or cold, nothing will make it blow cold just to clarify. Last odd thing is if I crank the heat up to max I get no airflow from anywhere!? What is going on?
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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?
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I 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?
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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?
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Well my a/c stopped blowing cold last week so I took it to an a/c shop and they said it was really low on freon. The guy recharged it and we noticed the driver side fan wasn't turning on. Said that it was causing to much pressure and it was blessing it off causing the loss of freon. So I came home and put it on the lift to check out the fans. I unplugged the fans from the bottom side below the fcm and the pass side fan comes on with a 12v source but when I put power to the other plug (drivers side fan) there's nothing across the high or low side. Guessing the fan is toast right? Just making sure before I order a new fan. What's all involved in replacing the fan? Also I've read the vw fans have a resistor that are known for burning out. Should I go with oem or a different brand from ecs?
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First 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....
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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.
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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.
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