Golf IV / Jetta IV :: 2002 - A/C Not Working - Compressor Won't Engage
Jun 15, 2016
I have a 2002 Jetta 1.8t and the A/c doesn't work. I took a look and I know that the clutch/compressor does not engage. also, the rad fans do not turn on when I have the AC on in the car. all I get is hot air. I tested the line and there is no freon in them whatsoever. which is why the compressor is off. however, I can't add any freon without it working. I checked the fuses on the side of my dash and on top of the battery as they seem to be ok. Also, I was told that I just need to replace the compressor with a new one and I should be good to go. Is this true? It will be an easy fix if it is.
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I have an 02' 2.0 Jetta Wagon, and the A/C is having some issues. Since I know close to nothing about A/C systems, I took it in to a few places to have it looked at. I've had the whole system Evac'd and recharged, and have had the low pressure fitting replaced (apparently there was a slight leak there), and the system is still not working.
The A/C worked fine when I first purchased the car a few months ago. Shortly after my 800 mile trek from Oregon, back to home, the A/C started to only work intermittently. The compressor would engage, then disengage, repeat...It seemed like a bad idea to keep trying to use it in its sad state so I stopped using it altogether. As I said, I had the system emptied and recharged, but it still only works intermittently. It sort of follows a pattern where upon start up it works longer, and switches on and off at shorter intervals, until it doesn't engage at all.
There are no strange noises from the compressor, and when it was hooked up to the machine, it proved to be performing its function well.
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Compressor does not engage, and my fans do not come on when I turn on the A/C. They do come on low speed when I jumper pins 1 and 2 on the temp switch plug, but they do not come on high speed when I jumper pins 2 and 3.
I have replaced the FCM with a new one, as well as a guaranteed working used one; neither one changed anything. I assumed right away that it was the fcm because my original one has a hole eaten through it from battery acid.
Compressor clutch ohms out within spec, and it will engage if jumpered.
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03 Jetta 1.8T AC is giving me fits. When the compressor comes on the AC is nice and cold. Problem is that it isn't on very much. Today was a good example. No AC for about the first 30 min drive to get an oil change (local driving). Next 40 min highway drive, AC only got cold for the last 20 minutes and then started to warm up before I got to work. Drove to auto parts place at lunch, AC cold from start to finish. No AC all the way back to work.
So, this evening I started the car with the hood up and watched. Compressor wouldn't engage. Pushed the AC button a couple of times and clutch engages. Compressor stayed on for 7 minutes and ice cold air. Clutch then disengaged and immediately both fans went to high speed for about 5 minutes with warm air out the vents.
Fans cycled back to low speed and compressor clutch engaged again for about 2 minutes this time. Fans to high speed again for 3 minutes, then compressor engaged for only a minute. Each time the compressor shut down, both fans would go to high revs. The minute they would go to low speed, the compressor clutch would engage and I'd get nice cold air..
Just had the expansion valve replaced and r134a charged by and AC shop last week. I have had the on/off AC problem for months and then could not get the compressor to engage at all for about one month. Of course, just as I was getting to the shop, it started blowing cold air.
Not sure whether I'm looking at an electrical problem or what. Just seems odd that both fans suddenly speed up and slow down and the compressor engages only on low speed.
The only other odd thing I've noticed is that cold or hot, as soon as I turn the ignition on (engine off), one fan continually starts cycling on and off. It does that continuously. I've checked the fuses on top of the battery and they all look fine. No appreciable drop in RPMs when the compressor engages. Fan control module?
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I got a 2003 GTI 1.8t and the AC air is blowing warm. With the car on, AC on and fans full blast both rad fans turn on but compressor clutch does not engage. Took it to a shop and the mechanic said the system was full of refrigerant but that the compressor was not getting the proper signal and there was an electrical problem.
I check the power at the compressor and it is reading about 7 volts, which is low correct? That should be getting 12-13 volts correct? I also check the pressure switch over by the passenger side and it was getting 13v. What to check next to start ruling out causes? Any quick way to determine whether this is electrical or a compressor issue? I am limited in my abilities as far as electrical work goes.
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I am trying to figure out why my AC is not working. Both fans are coming on and the AC button is light up but it is not blowing cold. The charge was checked and it has a good charge. The compressor appears to not be engaging. I checked for power at the electrical connector for the AC compressor and my voltmeter is showing voltage between 3.1-8.3 volts. It jumps around between that voltage every few seconds. The fuses have all been checked and are in not broken. What else should I be checking?
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Ok My Ac doesn't work on my 05 Jetta 2.0 blows hot air. These are the steps taken so far to no avail
_Function test A/C System_ A/C is not cold_ Recover A/C, System was low
_Pressure test system with nitrogen for leaks_No Leaks Found
_Charge system and add dye
_Test operation
_Found compressor not cutting in_ Inspect for ground at compressor_OK
_Test for power at compressor_NO POWER GETTING TO COMPRESSOR
_Inspect fuses_OK
What's going on with this and what the next steps might be?
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99 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.
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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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I recently picked up an 02 Golf with a 2.0/5-speed. It's just a plain-jane model without all the bells and whistles. My fans and A/C aren't working. I can deal with no A/C but the cooling fans are kinda important. I did all of the trouble shooting. Both fans work on low and high when jumped at the radiator temp switch so my fans aren't the problem. I replaced the temp switch with no change. My OBD-II scanner shows that my actual coolant temperature was about 10 degrees off from my temp gauge so I replaced the temp sensor too. The timing belt and water pump were both changed about 5K ago.
I borrowed a "good" FCM from a buddy's car and that didn't work either. I went through the troubleshooting diagnostics for the FCM harness and see that I do not have continuity between T14/14 & T14/5 on the harness side. This indicates that the "F38 Ambient Temp Swicth" is possibly my culprit. Everything else checks out good on the FCM harness. Where is this switch located? I've searched online and found nothing specific to my 02. For the sake of testing can I jump these 2 wires for continuity to simulate a working switch? From what I've read this ambient temp switch disables the fans and A/C when air temps are below a certain temp. My next step is going to be wiring in a variable speed fan controller if I can't figure this out .....but I'd rather not get in to that if I can get the factory setup working.
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So I just got a 2002 1.8t, everything was fine until the fans and ac stopped working. After poking around the forums a bit I changed the following:
1. Fan Control Module. Result: nothing
2. Radiator Cooling Fan Switch Temperature Sensor. Result: nothing.
all fan components have the correct voltage going to them. Fuse 16 for the AC clutch is not blown and has power going to it. The AC compressor has power going to it. The fuses on the battery box have power going to them specifically S180.
My question is what am I missing? is it possible that the fans themselves could be bad? car is not overheating, the after run coolant pump kicks on. But the AC clutch is not spinning nor are the fans. btw AC clutch is not seized up.
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I was having battery issues and had a friend hook up a battery charger to my car today. They pulled some relays to see if they could figure out why it was starting right. When I left for work the car started fine but I notice my windows would not roll down at all. I figured no biggie I would deal with it tomorrow.
When I got to work I realized my key fob had stopped working too. Again, I have a key will unlock it after work and deal with it later. After work tonight, I go to the car, I tried the key fob and nothing. No surprise. But I unlocked the driver door and it won't open, try to unlock the trunk it won't open.
I was told they pulled the relays and reseated them when messing with the battery. I can see a red light flashing below the radio. To top it off the keys to my other car are locked in the trunk along with my purse!
2002 Jetta Turbo 1.8....
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Last summer the a/c in the car was ice cold. And until last week, the compressor was engaging when using the defroster. I am sure it was working because I started it one night, switched the controls to defrost, and the belt squealed just a bit. I think it's become a little slack and I need to adjust it... Anyway, the weather has started to change, (in the 70's) so I thought I should kick on the a/c to make sure all is still good. It wasn't. The defrost will not kick on the compressor either? When I push the a/c switch, nothing happens. No green light in the switch, no compressor. The blower works though. I checked all the fuses that had anything indicating "a/c." All were good. I switched the a/c relay with the tail light relay, (seems to have the exact same ratings) no go. What gives? I figure it's not likely that it's low on Freon, it has never "short cycled." And, wouldn't the light on the switch come on under a low Freon situation? Lastly, why four pins on the low pressure switch? Any easiest way to check which system is the fault? Manually engage the compressor clutch, or maybe short the low pressure switch?
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MKIV jetta GLI, first two gears just won't engages as if it's still in neutral. Have to start her moving from 3rd. What could be the issue?
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AC compressor won't kick on at all. I know the system doesn't have much refrigerant (just replaced the line that runs from the expansion valve to the bottom of the drier, the drier itself, and the condenser)..
Evacuated the entire system with a pump. Tried putting refrigerant in and the pressure on the gauge goes up immediately into the yellow/red...jumped the connector on the high pressure switch and the fans came on, shouldn't the compressor kick on too?
Checked the 14 pin connector on the fcm for 12V...PIN number 8 is barely seeing any power which leads to no power getting to the compressor...
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The dealer diagnosed my a/c as needing a new compressor and clutch. I had an a/c specialty shop install a remanufactured compressor and clutch. however, they could not get the compressor to kick on. I checked all fuses (all are good).
I checked the compressor continuity (good, 0 ohms). I checked the plug where the compressor clutch plugs in (it reads 12 volts). the funny thing is, it reads 12 volts anytime the engine is running (even if the climatroinc is turned off). I am definitely not an a/c expert and really don't know how this stuff works.
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My AC doesn't work right now, however, sometimes it works. It's very random, it doesn't matter if its hot outside or if its cool.
What happens is my AC clutch doesn't engage. when I turn ac on, it raises the idle for a second, and as soon as it does that, my ac compressor gets around 12 volts for less than a second, and the idle drops again. it does that in a loop.
My fans work fine, both high and low speeds, everything else works, all the fuses are good. I changed the pressure switch, didn't fix the problem. I also checked the ac coil and clutch. everything clicks and works. ground on the compressor is good.
Other odd thing - positive wire on the compressor constantly getting around 3 volts. What can it be and what else do i need to check?
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In my 2001 2.0, my AC has been blowing hot air for a while now. It was intermittent at first but now is constant.
The compressor runs without going off when the AC is switched on. I can tell because I see the compressor clutch engaged and spinning.
I tested with AC manifold gauges and these are the readings I got.
Engine off : Low is 0, High is 135
Engine on, AC on full blast after running 10 min at 1500 RPM:
Low is 4, High is 135
Looks pretty bad.
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2000 jetta 2.0
so far i have replaced 2 fans ; thermal switch in radiator ; ran all the tests i can find ; all fuses and relays seem fine ; jumped compressor and it engages .
key on & car NOT running there is no power to the compressor.
I wanted to check the low pressure switch but every test is for a 2 wire set-up.... mine has 3 wires. which wires do i jump?
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I have a 2004 Jetta wagon 2.0. About 2 years ago my compressor was replaced with a used one and the a/c was working perfectly fine. Last year the air from the a/c began to get warmer until it completely stopped blowing any cold air. A couple of weeks ago we checked the freon lines and they had plenty of pressure in them. We also checked the fuses in the car and on top of the battery along with the fan control module. The compressor spins from the serpentine belt but the clutch does not engage and there is no power in the wires going to the compressor. There is power at the high pressure switch but the condenser fan does not come on unless the switch is jumped. Could the culprit be the ambient temperature sensor?
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AC went out last week, was working great earlier that day. Checked under the hood and the clutch isn't engaging. Noticed an RPM spike every four seconds or so at idle when the AC was on. Checked voltage coming off the wires that go to the clutch and saw a voltage spike from essentially nothing to 9-12V which occurred in sync with the RPM spike. I poked a screw driver in the high pressure port and got a nice blast of coolant so I figured refrigerant isn't the issue.
Fuses are all good, in car and on battery. Replaced the fan control module and now there's no RPM spike and I get a constant 12v with the AC on at the clutch wire, but it still doesn't engage.
It's a 2000 Jetta 2.0 auto.
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