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    Thread: Radiator fan won't work, Ive tried everything............HELP!

    1. 02-15-2008 08:57 PM #1
      O.k. I tested the radiator fan and it was bad, so I replaced it. When the engine gets hot it still wont turn on. So I pulled the radiator temp sensor and put a jumper on the plug and the fan kicks on. So I replaced the sensor with a brand new one and drove the car around and what do you know...................radiator fan still wont kick on


      Does anyone have any good suggestions, it would be greatly appreciated.


    2. Member Samz09's Avatar
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      02-15-2008 08:59 PM #2
      happend to my sister cabby, tried 3 fans, new relay, before we realized that there wasnt supposed to be any emty spot in the fuse box , put a fuse it and wala

    3. 02-15-2008 09:01 PM #3
      I checked the fuses..........they are there and in good shape!

    4. Member _a2coupe2a_'s Avatar
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      02-15-2008 09:07 PM #4
      im having the same problem and im actually planning on digging into it tonight. Ill let you know what i find.

    5. Member Jetta A2 1989's Avatar
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      02-15-2008 09:13 PM #5
      Is the lower rad hose getting hot?

    6. 02-15-2008 09:19 PM #6
      Yes, the thermostat is working. Upper radiator hose gets hot and after I let the engine run the temp sensor gets hot to the touch. Where is the relay for the radiator fan/cooling system. Is it the one mounted on the upper portion of the radiator fan housing? I havent checked it yet........could that be my problem.

    7. Member Jetta A2 1989's Avatar
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      02-15-2008 09:55 PM #7
      Check the AC relay position #5 on a 1988, Pos #1 late 89 and up.
      #13 stamped on relay.
      Does low speed run when you set the selecter to defrost?
      The relay on the fan shroud is for hi speed only. IIRC

    8. 02-15-2008 10:21 PM #8
      Where is that relay?

    9. Member Jetta A2 1989's Avatar
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      02-15-2008 10:33 PM #9
      At the fuse/relay panel.

    10. 02-15-2008 11:31 PM #10
      The relay is on the top of the rad . Check the connections on it it might be rusty check for broken wire

      You say VoilÃ* and maybe Wala !


    11. Member compu_85's Avatar
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      02-15-2008 11:50 PM #11
      The relay only runs the high speed...

      Is there power to the switch on the rad? If you jumper the wires at the switch does it work? The wiring for rad fan is really very simple...

      -Jason

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      02-16-2008 12:31 AM #12
      got the same problem!!! ah!

    13. Member Jason_Reuben's Avatar
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      02-16-2008 03:37 AM #13
      When you jumped the fan switch, Did you jump it from the 12v pin to both high and low on the fan????

      Or did you jump power from the battery to the high and low wire in the connection?

      Did you check for 12v at the fan switch?


    14. 02-16-2008 03:40 AM #14
      I jumped it from both high and low and it kicked on in both speeds, I didnt jump it from a 12 volt source, I jumped it straight from the plug that conects to the radiator temp sensor. I ordered the two relays and I hope that will fix it. If it dosent Im stumped


      Modified by surfer459 at 11:55 PM 2-15-2008

    15. 02-16-2008 11:59 AM #15
      just a hunch, but check the relay on the fan shroud. fans wont work if that relay is toast. ask me how i know.
      '11 Routan SE (black), '01 Jetta GLX VR6 5spd (silver)
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    16. 02-16-2008 04:38 PM #16
      I hope its a relay

    17. 02-16-2008 05:51 PM #17
      i know that they don't turn on until your car gets hot enough, my fan don't even turn on till the temp gauge gets to half way mark. check and see what your temp guage shows if it is over half way and your fan is not on then you have a problem

    18. 02-16-2008 06:51 PM #18
      The temp of course goes past half way. I let it get three quarters of the way up and turn the car off and the fan never kicks on.

      I also noticed the upper radiator hose gets hot and the lower hose doesnt. I have a brand new thermostat.........could my water pump be toast?


      Modified by surfer459 at 2:56 PM 2-16-2008


    19. 02-16-2008 07:02 PM #19
      Quote, originally posted by surfer459 »
      The temp of course goes past half way. I let it get three quarters of the way up and turn the car off and the fan never kicks on.

      I also noticed the upper radiator hose gets hot and the lower hose doesnt. I have a brand new thermostat.........could my water pump be toast?


      Modified by surfer459 at 2:56 PM 2-16-2008

      thermostat is blocked by air. bleed again.

      '11 Routan SE (black), '01 Jetta GLX VR6 5spd (silver)
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    20. Member gti2.0016v's Avatar
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      02-16-2008 07:13 PM #20
      I'm working on the same problem. I've NEVER had this much trouble with a cooling system This time I'm putting a aspirin in the thermostat or drilling a hole in it.


      Anyone ever try the apsirin thing? I'm about to burn this car to the ground. I've tried to get the air out numerous times. By the way it's on a passat but all 4cyl cars are the same.


    21. 02-16-2008 08:05 PM #21
      How do I bleed a thermostat?

    22. 02-16-2008 09:23 PM #22
      Never mind..........its bled and the top and bottom radiator hoses are now warm. I figure the only thing else to try is the high speed solenoid. That has to be it.

    23. 09-09-2008 03:13 PM #23
      I have a problem the car over heats and the cooling fan does not come on.
      the heater inside the car also cuts out .
      temp reaches 3/4 on the gauge.
      fan works if i put 1v across the fan itself works on low and high speed.
      no relay ontop of the fan shroud any suggestions its a 1992 j plate runout mk2

    24. 09-20-2008 08:01 AM #24
      my lower rad hose is not getting hot but all other ones are red hot.fan works if i put 12v across the terminals direct from the battery but it wont work other wise.
      any help would be appreciated

    25. 09-20-2008 08:02 AM #25
      how do you bleed the system?

    26. Member The Mexican Dub's Avatar
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      09-20-2008 09:22 AM #26
      you run the engine with the coolant cap off, rev it up a couple times so the air bubbles burp out, turn your inside heater while doing it so it circulates all over the place.

      Now, cap back on, rev and hold around 2000rpm until the fan starts kicking.

      If you can see some coolant coming out the thin line into the reservoir, then the pump should be working.


    27. Member Turbo2L's Avatar
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      09-20-2008 08:39 PM #27
      Im having this problem to. So if the lower hose isnt getting hot, i need to bleed the system?
      bankrupt.

    28. 09-22-2008 04:10 PM #28
      ok so far tonight i have removed the rad completely and checked it water flows through it so it is fine. filled the rad resevoir back up with water sqeezed the hoses with the cap off run the heater fan
      have done the running the car with the cap off and then placed it back.
      still no joy hot top pipe and cold bottom pipe . there is a trickle of water into the resevoir. temp gauge hits 3/4 on the scale used to sit just under 1/2
      i am thinking the water pump is shot. but not sure how to check if it is or not but reading above if the water flows back in through the small pipe to the resevrior the pump is ok


      Modified by golffie at 12:18 PM 9-22-2008

    29. 09-22-2008 04:12 PM #29
      where is the thermostat? is it the 2 sensors ontop of the hose close to the engine block which leads to the top of the rad?




      Modified by golffie at 12:15 PM 9-22-2008


    30. 09-22-2008 04:22 PM #30
      my fan has no realy on it on the fan shroud. I have a 92 runout gti 8v there is no relay #13 on the fuse panel inside the car

    31. 09-22-2008 05:25 PM #31
      The water pump is a very simple piece of mechanics. If it's no good, you'll hear it 99% of the time.

      If you think the fan is not working do this: 1) get a fluke meter 2) get your car hot 3) check BOTH sides of EVERY switch and relay in the chain between the battery and the fan. If the fan should be on, there will be juice at one side and none at the other side of a bad switch/relay. I've had to do this on every Mk2 I've ever owned at one point or another. The cooling system is very temperamental on these cars.


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      09-22-2008 06:19 PM #32
      wow..

      if your fan isnt working properly, it could be as mentioned above. air bubbles.. most people dont realise, that a simple air bubble can keep your system from sunning correctly.. simply disconnect the upper rad hose from the radiator and fill with coolent til it comes out. put the hose back on the radiator, and burp it a few times (squeeze the hose). Remove the hose to make sure its still full. Then remove the overflow cap and run the car. you will have coolant boil out as air is being removed. that is the best way to make sure your coolant system does not have any bubbles in it.

      works on all applications. the overflow is not the best place to fill your car with coolant, unless you are just topping it off.


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      09-23-2008 01:24 AM #33
      I've always just dumped coolant into the overflow with a funnel and i've never had any problems because of air bubbles

      i just fill'er up, run the engine with the cap off for a minute or two, then top it up again.


    34. Member
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      09-23-2008 01:54 AM #34
      Had a little trouble with my radiator fan...


    35. Member vwbeaner's Avatar
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      09-23-2008 01:57 AM #35
      ^^^^^^that is messed up

      I took out my fan relay setup, and all a/c parts, and ordered the non-a/c pully from toywagen.com and wired it up like this and mine works fine now, all the wires were hacked to ish.

      Good Luck

      -Ben

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