Golf IV / Jetta IV :: When AC Is Switched On, Compressor Runs Without Going Off
Jul 1, 2016
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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A fault has returned. Last spring the 1.6 diesel Golf (105HP) would not start.
The RAC first diagnosed a faulty battery and replaced it. Then they diagnosed a faulty start solenoid.
My local service garage replaced the starter. Had good reliable starting for 6months. Two days ago my car would not start.
RAC diagnosed a suspect poor engine earth strap. "Get it fixed."
But when I got home and switched off, I noticed that the radiator fan had turned on at full speed. and ran and ran very noisily. I switched on the ignition and the fan went off.
Switched off the ignition and near silence, A little background hum and this stopped when the dash went out about a 20second delay. Then about 30seconds later the fan came on at full speed.
I checked again about 15minutes later, still full speed.
Attached my battery charger, so that I would not have a flat battery in the morning. It finally went off after about 40minutes.
Last night I came home and the same fan on after a delay of about a minute after switch off.
This time the fan was still running after 90minutes. Attached the battery charger again and went to bed.
The fan was off at 0730hrs, but at 0745hrs it was back on after standing in sub zero conditions all night.
Even with the charger working the battery is virtually flat, because the fan is drawing more current than the charger can supply.
I disconnected the battery and it's on charge now. Hopefully It'll have enough charge to get me to the shops and back (22mile round trip and typical of my running, the nearest big town is 20 miles away). What is going on?
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I have an 01gti glx and my headlights are not working when i turn my headlight switch on. They work just fine when i release the ebrake just not working with the switch! I checked the fuses under the dash and all were good.
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Went from this
to this
But now for some reason both of my reverse lights aren't working...
Since my first post the jetta has come a long way. still has a longer way to go.
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1994 geo tracker... I'm trying to get my A/C working, but I'm running into an electrical issue somewhere. The relays for the condenser fan and compressor are not activating, even though they are getting 12V when I switch on the A/C. I can run a jumper across where the relay would switch and both turn on and my A/C is cold, but it won't do it without the jumper. I've traced back from my battery to the A/C and checked my dual pressure switch, I'm slowly trying to pick out wires which may have fried.
Both relays work when connected to the battery alone. If I jump the 12V and ground on the harness for the compressor and the harness for the condenser fan, they kick on and A/C is cold. Fuses are good, dual pressure switch is good? It's almost like the relays aren't getting enough current to activate, one of them the switching signal reads only 4 V which is too low, that's for the fan. The compressor reads 12V though on the switch. When back probing them with the relay connected I only read 0.25 V, I don't know if that matters or not.
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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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I just got done with a complete engine rebuild on my 02 1.8t jetta, had everything hooked back up and went to start it for the first time and it wouldn't. I went back looking for loose connections, nothing. Worked and banged my head for a day or two, I had fuel and spark but couldn't get it to fire. Finally I "choked" the intake to see if it was getting too much air and it fired right up. I unplugged my map sensor giggles and it starts up perfectly. I then hooked everything back up and what do you know it starts up and runs fine, but if I plug the sensor back in it kills the motor after about 10 seconds of running and won't start until I unplug the map again.
Car runs and drives but wont boost over wg pressure but that's probably because sensor itself is unplugged. I just wanna know what could cause it besides the sensor itself being bad. I ordered a new one waiting for it to get here (hoping it fixes the problem).. And I'm talking map (manifold absolute pressure) not maf (mass air flow), just in case people are confused.
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For the last couple years the engine light would come on solid every once in a while - read codes for the thermostat - my father-in-law checked it out (mechanic) and said it was fine and that the Jetta was being too liberal with it's engine light.
Engine light recently has started to come on more often. Started using premium gas - CEL went away for a few months. But now it keeps coming on, and once in a while flashes and the car runs rough. But it's intermittent - it'll go and come. Codes are:
16804 - catalyst system bank 1: efficiency below threshold
16684 - error in mapped cooling system
16685 - cylinder #1 misfire detected
Seems to me that the cylinder misfire would be the main issue here. I've changed the spark plugs pretty recently. Catalytic converter not too long ago also. I haven't changed the coil pack since I first got it like 6-7 years ago. With all the issues these years of VW's have had with coil packs, I'm fairly certain I need a new coil pack. O2 sensor?
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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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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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My friends car suddenly quit running while he was on a trip, he went through the carwash and as he pulled out the car died. He had it towed to a shop and they charged him $400 to run a few tests and replace the fuel pump relay thinking it would fix the problem, obviously didn't or i wouldn't be typing this. At this point the car cranks but won't start.
This is what the sheet from the shop says, "retest through PCM to locate problem. Ran diagnostics per flow chart. all power, grounds and G28 engine speed spensor output to ECM test good excepting pin T121/86, wire color Lilac/yellow. Signal between camshaft position sensor to ecm. No voltage signal recommend replace PCM and RETEST."
I've put a used ecm (ecu? i've read both terms used) in and the car cranks, starts, gets to idle and dies. If i give it gas after it starts it'll rev up once, then die. I'll call it progress, but i want this damn car out of my driveway.
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2001 VR6 GTI....
Already done:
Replaced the coil pack and plugs
Measured resistance of plug wires (all at about 6K Ohm)
Replaced front O2 sensor
Replaced purge solenoid valve
Replaced coolant temp sensor
Replaced fuel filter
Replaced fuel pressure regulator
Replaced MAF sensor
Cleaned the throttle body
Cleaned the throttle position sensor
Ran a tank of seafoam treatment (injectors were new 6 mos ago.)
Checked running voltage of battery
It was smoking and stinking bad with a rich mixture. It improved with the MAF change but still runs like a farm tractor. Now it idles on 3 or 4 cylinders, runs rough through 3000 RPM then runs cleaner at above 3000 RPM, but only at light throttle. CEL is either on or flashing when driving.
Don't know what to do next - nice car not fun to drive like this. What this could be and how to test it?
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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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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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I have a 2003 2.8 GLI and my compressor clutch will not engaged i provided the clutch with a direct power and ground from the battery and it engaged. i also went to the junk yard and got a couple of Fan Control Module ($4 each) and it still does not engaged.
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Golf 2.0 ... Finding the location of the AC Clutch/Compressor relay location. On the TDI its behind the the dash and I looked on mine and it doesn't seem to be the same. I've seen a thread where some said it was under the battery? Where it is and what number will be stamped on it. Another thread said it should be behind the dash and number 385 or 358, I looked and I don't have those numbers back there.
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2002.5 VW Jetta GLI VR6 24V 6-Speed. Barely accepts a small can of Freon from full empty, and pressure goes to over 100 psi in the red, compressor does not kick in, idle fluctuates with A/C button on, small fan kicks on fine, some air pump turns on and off with the erratic idle and sounds like shot of compressed air. When I turn the A/C button off, idle comes back to normal and that psss sound is gone. I already changed compressors and that made no difference. Video below.....
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Clutch for the AC Compressor will not disengage even with the AC off. The only way I can daily the car is if I disconnect the power from the AC Compressor at the compressor itself. Seems the AC compressor has a constant draw if it is plugged in.
Plugged = dead battery...
Unplugged = good battery...
I'm getting ready to rip the damn thing off the engine and calling it a day, but that would defeat the purpose of me buying a new compressor.
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