Golf IV R32 :: Fans Won't Come On Unless AC Turned On
Mar 18, 2011
I have changed all fuses and even the temp sensor to the green one. My fans wont kick on unless I put on the AC. Where is the fan control module?
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Mar 18, 2011
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Golf IV / Jetta IV :: 2001 - When The Car Is Turned Off The Cooling Fans Stay On
I have a 2001 jetta 1.8 turbo. when I turn the car off the cooling fans stay on and kill my battery. Ive been told it could either be a relay or temp sending unit but i dont know what one to tackle first, also my coolent temp stays way low almost as if the thermostat is stuck open.
View 2 RepliesCamry :: Cooling Fans Will Not Come On Except When AC Turned On And Stop Working When AC Turned Off
2003 camry 2.4 ... This is what is happening, cooling fans will not come on except when the AC is turned on and they will stop working when the AC is turned off, otherwise the car will over heat.
This is what I have done...Replaced the fans (because the radiator fan was bad, after hooking them up directly to the battery). I checked all the grounds, including the one under the intake, checked the fuses, checked relays using 12vots to the relay and used a ohm meter to see if it made contact when activated, on the three fan relays. Replaced and tested the new radiator sensor using a pot of water on the cooking stove with a cooking temperature gauge and ohm meter. It tested ok.
Unplug the radiator sensor while the car is running, the fans will come on, but go off as soon as it is plug back in, even when the motor is over heating. Also replaced the thermostat.
What can I do next, before I burn the motor up trying to fix it? Motor just started running rough. Just now pulled up a code of the number three cylinder miss firing
Nissan - Sentra :: 2004 - Coolant Fans Do Not Come On At All Unless AC Turned On
I have replaced the thermostat, radiator, coolant temperature sensor, and coolant. The gauge on the dash shows normal operating temperature, but the overflow keeps filling up after about ten minutes of driving? I noticed that the coolant fans do not come on at all unless you turn on the air conditioner?
View 19 RepliesChevrolet - Lumina :: 1996 - Compressor Clutch Does Not Engage And Fans Do Not Spin When AC Turned On
I am having trouble with my air conditioning system in my 1996 Chevy Lumina. When I turn on the AC, the compressor clutch does not engage and the fans do not spin. I was able to jump the compressor so the clutch engaged, however, the fans still did not spin and the AC was not cold. I then jumped the low pressure cycling switch (near the accumulator), which caused the fans to spin while the compressor was running. However, this still did not produce cold air from the AC and none of the AC lines were cold to the touch. I am starting to think the system is low on Freon, but I do not have gauges to test the pressure.
View 2 RepliesGolf IV R32 :: Fans Don't Come On - Car Running Hot
My R now has 78k on the clock so I guess it's time for the obligatory issues with the radiator fans. My car started running hot from time to time, not constantly. Brief explanation of the issues and my "diagnosis" for each:
Without the A/C turned on the fans don't come on - when I turn the A/C the passenger side comes on all the time (faulty switch). Driver's side fan is intermittent - usually it turns on with the a/c but if it doesn't a tap on the center with the lug wrench gets it spinning (stuck brush).
The main thing I want to make sure is that it's not a thermostat issue as well (or instead of the switch). The heat works fine - I've been blasting it every time I hit traffic on my way home just to ensure that the car doesn't overheat. My assumption was that if the heat works then the thermostat is opening to allow the coolant into the heater core.
Golf IV R32 :: Fans Staying On When Car Is Off
So once I start the car the fans kick on, and stay on, even when off. The car currently has no coolant in it and it is not being ran longer than to simply start it. I am guessing the fan control module is no good? Anything else to look for? The car has a new green coolant sensor and the coolant res. is deleted.
Also, what resistor to remove the coolant level sensor? I would like to rid my dash of that annoying light.
Golf/GTI VII :: Seems Defroster Fans Are Rattling
My a/c is really starting to bug me. In auto it blows through the defroster (windshield) and the face vents. It almost sounds like the defroster fans are rattling. If I turn the defroster fan off the sound goes away.
View 5 RepliesGolf V R32 :: Fans In Engine Bay Won't Turn Off
The fans in the engine bay wont turn off. As long as the car is on they run. they do turn off when the car is off.
View 10 RepliesGolf IV R32 :: Neither Of Fans Spin Anymore
I think my fan module might be bad because neither of my fans spin anymore, and my air conditioning doesn't work either. My buddy let me borrow a fan module but it isn't the right one, I just need a picture of the connectors or a part number would be good too.
View 1 RepliesGolf IV / Jetta IV :: Radiator Fans Are Unreliable
As it was such a matter of time, my fans on my 24v gave up during winter, no big deal as it was a pretty cold winter but now that spring is around the corner, I gotta fix this issue. To they change for the same OEM unit that will die in the next 30k miles.
View 3 RepliesGolf IV R32 :: Fans Won't Turn On - Car Started To Overheat
Started the R and moved it out of the garage after the motor build. At which during that time I replaced the large fan with a new one from Ecs and the small one I took apart and cleaned up after I found the Diy for it.
Before I rebuilt the motor the car started to over heat on its last ride home before the rebuild (Neither one of the fans would turn on). So I replaced the switch on the radiator today and let the car warm up and the fans didn't kick on again. I checked the fuse and it good but I'm not sure where the relay is.
Also my A/c is not charged up. I also touched the coolant lines running to the Aux radiator and they are cold. And I do hear the after run/electric water pump running.
The green coolant temp sensor is clean and plugged in. Could it be the thermostat? Are there any fuses in the panel that sits on top of the battery that deal with the fans? Is there a way to test the coolant fan control module?
Golf IV / Jetta IV :: Fans Staying On All The Time
I have a 1.6 8v mk4 Golf, and my fans started staying on all the time. There are 2 coolant sensors on this model, one is the green one, and the other is the black one which seems to be hardwired into the thermostat housing. Anyway, I changed the green one, and that didn't solve it, so changed the whole thermostat, which obviously came with a new sensor build on....Hey, it worked, for 2 weeks, and then the fans started coming on again as soon as you turned the ignition key...and the temp needle doesn't move much, as before.
My suspicions have moved to the sensor wiring loom, that was fiddled with, while changing the thermostat...I hear they can become brittle over time, and so behave as if the sensor is unplugged, i guess.... Do these wires unplug anywhere in there so I can test the loom properly?
Golf IV / Jetta IV :: Overheating - Fans Not Coming On
As the title says, car is overheating. Car gets to 190F within a couple miles drive. Temperature fluctuates between 190F and 225F.
Water pump was replaced ~2 months ago. Was not overheating prior. Temp reached 190F and stayed. Currently has the "black top" coolant temp sensor.
I noticed the coolant fans are not running after I turn the ignition off. This time of year they would usually be running after turning the engine off. If car is overheated and with AC off the fans do not run while engine is running.
I used the guide below to try diagnosing the cause: [URL] ....
Remember both fans should come on in slow speed any time the key is on and the AC is on - if the temperature is above about 32 F (0 C). Both fans run with key on and AC on
S180 (fuse 8, 30 amps, green plastic, above battery) must be good for slow speed operation.
Fuse and holder look good: no melting, no discoloration.
S164 (fuse 3, 40 amps, metal strip, above battery) must be good for fast speed operation.
fuse looks good: unbroken.
To ensure the AC circuits and the Fan Control Module has power check:
Fuse 5 on the cabin fuse panel.
Fuse 16 on the cabin fuse panel. When this fuse is blown the radiator fans will often run unexpectedly.
Fuse 25 on the cabin fuse panel.
All three fuses look good: unbroken
For the first test of the slow speed fans from the radiator thermoswitch have the key off.....Both fans should run in slow speed.
Passed test: both fans run slow
The second test is for the fast speed fans, key on, AC off.... Both fans should run in fast speed.
Passed test: both fans run fast
If the fans run in the tests above, then you should be good to go. No further tests are needed.
If you have been seeing high coolant temperatures and the fans have not been running, then you may need a new thermoswitch.
Golf IV R32 :: Fans Not Working So A/C System Not Function?
how common a problem it seems to be that our fans just stop working. Replacing those later this week.
My question is concerning my AC not working. Is it possible that, since the two fans won't work at all, the AC system won't engage? Or do I have two completely unrelated problems?
Golf IV R32 :: Cooling Fans Not Turning On And A/C Not Cold
The last few times I drove my car, I noticed the A/C didn't feel very cold. I checked today, and noticed that neither cooling fan comes on with the A/C on. My understanding is that both fans should be in LOW mode with the A/C on. Also, after idling for a while and even after doing some spirited driving and pulling over, the fans never turned on.
From what I'm reading, this sounds like it probably is either the fan control module or the fans themselves failed. Is the fact that both fans don't work in either high or low speed point to this being more likely to be a fan control module? Would this show up as a fault code on a VAG-Com scan?
Golf IV R32 :: Cooling Fans Continue To Run Until Battery Disconnected
After about 3 weeks, I finally get my 04 .:R32 back from the shop after getting a new fuel pump (long story there) and the mechanic mentioned the fans began to run and stay running when the key is turned to the on position and then turned off, key removed etc. I picked the car up tonight and repeated his claim turning the key to the on position and the fans kicked on and stayed on until the battery was disconnected. I am hoping there is an easy fix. What this could be? FCM maybe?
View 20 RepliesGolf IV / Jetta IV :: 2003 - Compressor Does Not Engage, Fans Do Not Come On
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.
Golf IV R32 :: CEL Code P2181 - Radiator Fans Do Not Turn On
So this seems to be a common code that is thrown when you near 100k miles, I'm at 77k .. This thread seems to be the most organized [URL] ....
"Long story short, there are 5 main reasons this problem can pop up, listed in order of likelihood, least to greatest:
1) Coolant sensor
2) Thermostat
3) Bad fans
4) Coolant mixture
5) Water pump "
My issue is that the only ones I'm (probably) able to rule out is coolant mixture and bad fans. My radiator fans do turn on from time to time, so I thought I'd ruled that out (unless it would throw a code for not turning on at appropriate times?)
I heard of a test to turn on your AC and see if they turn on, but my AC hasn't blown cold air like ever, so I don't know if that affects the test (probably not?)
A couple years ago I had a shop replace the original thermostat with the new one, or was it the coolant sensor, or both (ugh, I don't remember!) That leaves thermostat, coolant sensor, and water pump.
I guess my main question is is there anyway to find out which it is between these 3, without spending so time, money, parts etc? It doesn't seem the coolant sensor is easily accessible for one.
My car has been really slow recently but I also need to change the spark plugs, I'm doing that this week. I cleared the CEL/P2181 code and it returned a few weeks later,
I'm starting to change my mind about this car being easy to maintain/reliable, I'm always on time with maintenance and with only 77k miles on a 2004 car.
Golf IV / Jetta IV :: Smoke Coming From Radiator Fans
I don't understand what is going on I noticed smoke coming from my fans radiator fans and I'm pretty sure that it was motor being fried I've gone to the junkyard and bought a used assembly hooked it up and still nothing could be a possibility that when the motor fried it fried the control module for the fans
View 1 RepliesGolf IV / Jetta IV :: 1999 - Overheating / Fans Not Running
So my friend, ignoring my advice that this generation seems to be riddled with electrical problems, decided to purchase a seemingly nice 99 Jetta, with a junkyard AEG swapped in(AEG is written on the intake and block like a JY would do). Sun roof doesn't slide back, gets jammed, evidence shows water has built up previously and run down the A-Pillar to the fuse box.
I just got the fans unplugged and verified that the fans with power applied, both have their low/high speeds. The fuses on top of the battery are in-tact, no visible melting, looks like the thing is in ok shape(haven't taken them off to inspect the contacts yet).