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Search Auto Parts Search 2001 VW Jetta Radiator Fans Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum jlbn9 New User Sep 18, 2007, 6:40 PM Post #1 of 4 (5902 views) 2001 VW Jetta Radiator Fans Sign In       I have a 2001 VW Jetta 1.8L. There are two radiator cooling fans. The big fan to the left of the engine was burnt out so I replaced it. With the new fan installed... the fan will kick on when I start the AC, but go out just a couple minutes later. If the car sits for about an hour or so - the fan will work when I start the AC, but then goes out again. The mystery is - the secondary cooling fan always runs when the AC is engaged. For some reason it is just the big fan that I am having problems with. I tried manually spinning the fan with my hand when the AC was on - and the fan actually started. Another time, I manually spun the fan and hit the back of the fan motor with a wrench - which also kick started it on one occasion. I have checked to make sure I am getting a full 12v through the big fans connector, which I am & all the wiring looks good. Question is - does this sound like a possible short in the wiring, or the fan control module? Perhaps I purchased a bad fan? Any help would be appreciated! (This post was edited by jlbn9 on Sep 19, 2007, 1:44 AM) Tom Greenleaf Ultimate Carjunky / Moderator Sep 19, 2007, 3:58 AM Post #2 of 4 (5891 views) Re: 2001 VW Jetta Radiator Fans Sign In Hmmm?? This motor has failed once and replaced and now does this. Is the replacement NEW or a REBUILT? If new I would tend to not blame the new motor. The rebuilts of lots of things use parts from an old one that may have had an intermittent problem like this that went unseen in testing at time of the rebuild. Some guess work for this: The first one failed and you seem to know that. With that and the new one working better but not well or dependably it suggests that the motor is being forced to work with less than adequate power which is hard on electric motors. That's why starter motors have that "flutter" when your batter is not up to snuff because it would just sit there and burn it if it kept trying. There should be a relay for this. They are not serviceable but I have smashed some open to see what goes on in there. The ones I've looked at used points to make the more powerful (amps) voltage available for the motor with smaller gauge wire to control that. Those points can touch and make no electrical connection or a poor one. Rapping on relays sometimes can get them to work or work better for a while but replacement is always indicated. You said the connections look good. Check them all and clean them and use grease (silicone works) at those connections. Just clean may not be enough. The spade type can be twisted a touch to get a better contact and the pin types torqued or gently compress to outer to be tighter. Don't forget ground. If the power can't get to ground it's just as much trouble as no power and more tricky to find as the 12v testing will show power so reverse the test light or device to check ground. I don't know if this motor has a start up capacitor but if it does that would be the most likely problem. It takes a momentary burst of juice to get an electric motor going and that's what that does. They are used in 110-220/house motors frequently in things with motors but I don't see that in 12v stuff so much. I think this is a connection problem. A short suggests that a wire is worn thru insulation and grounding out to the wrong thing and it doesn't sound like that. If the connectors look stressed by heat - like a burn't look they should be replaced. The ones that are common are showing up aftermarket so if you find that a problem exists ask about that. Good luck, T jlbn9 New User Sep 19, 2007, 4:44 PM Post #3 of 4 (5889 views) Re: 2001 VW Jetta Radiator Fans Sign In Thanks for the response! I took my Jetta by the mechanic today - and he confirmed that the fan motor I purchased was bad. He was able to get it to turn - but it would not hold the power it was getting for very long at all. I ordered a brand new fan - so hopefully I will not have the same trouble with it. The mechanic checked to make sure the fan connection was getting 12v - he told me it was being called for in low and high speed... so apparently it is not the fan control module. My only concern is that there is something wrong - causing the fans to short out. It may just be bum luck that I got a bad fan - but the company that I bought it from rarely has this kind of problem (according to them) with fans being shipped bad. The new fan should arrive next week. It's manufactured by a company called TYC -- apparently fairly popular for aftermarket fans. It is costing me 100 bucks - that's 100 less than a fan from the dealer - so hopefully it will fix the problem when I get it in. Tom Greenleaf Ultimate Carjunky / Moderator Sep 20, 2007, 6:40 AM Post #4 of 4 (5884 views) Re: 2001 VW Jetta Radiator Fans Sign In I do think the motor itself was bad. If it does not get the required voltage and amps it needs it can be hard on the motor. That would be caused by a poor connection or portion of wire and it would get hot there and very likely show evidence of that. New motor should have a warranty. If it fails agian early it must be a supply problem. That should be checked with the motor running (load) and if not correct that's the time to find where the power drop is happening, T   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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