Date: Sat, 14 Aug 1999 08:42:20 -0500 From: Dylan Dickey <dillziesnopsamail.com> Subject: Re: radiator fan question...
Jim, your post didn't say 900 or 9k... so if it's a 9kT then you have a two speed cooling fan and a A/C fan. the two speed cooling fan is controled by a sensor mounted into the radiator (lower left side). it has two different "switches" within it for normal and high temp. is not uncommon that the low temp "swtich" goes bad, thus the cooling is controlled by only the high temp sensor. a quick observation, if the fan continues to run after the car is turned off, its a good thing because that indicates that the 10 minute delay timer and low speed fan are working properly. if the fan stops when you shut off the car, the low temp sensor or fan or delay relay is bad. a quick check would be to supply ground to the wires running from the sensor, you should see/hear the fans running. larry John Weiss wrote: > It sounds like it's working correctly. > > IIRC, only the older, non-air-conditioned 900s used a single fan. When AC > is added, both fans come on when the coolant temp gets high (2/3 to 3/4 on > the gauge, if you have the standard thermoswitch; a VW part is available to > turn them on earlier). When the AC is turned on, first one comes on, then > the second. Both run most of the time. > > I wired a switch and second relay to jumper the fan relay that controls one > fan. I can turn on a single fan at will, and the second fan runs normally > via the thermoswitches. > > -- > John R. Weiss > Seattle, WA > Remove *NOSPAM* from address for e-mail reply > > leone <leonenopsam.com> wrote in message news:37A7B9FB.C2077B4Bnopsam.com... > > i've got an '89 turbo and i just replaced a radiator fan that was blowing > the fuse when it ran. the new fan is working but i think it might not be > going on at the right time. > > i just bought the car and i'm not sure exactly when those fans are > supposed to operate. > > > > - if i push the a/c button in they both go on. > > > > - if the car gets really hot (up above 3/4 on the guage) they also both > go on. > > > > - if the car's "warm" and i jump the sensor that screws into the radiator > > they both go on. > > > > i thought there was a condition where only one fan would go on and off ?? > > > > are there other sensors? i'm guessing there's one that's inline in the > radiator hose and i heard there's a "computer" somewhere that's also > involved in all this. > > > > i'm wondering the best way to trouble shoot the system. i'm trying to > avoid going to the dealer. for all i know it's working correctly. i > thought that a single fan was supposed to go on at around 3/4 of the way up. > it seems like it's waiting until it's higher than that. sitting in traffic > in 85+ degree heat i get nervous and push in the a/c button to make sure > both fans are on (i know you're wondering why i don't have the a/c on > anyways but i like the windows open and i don't like the way the car feels > with it on (i get weird vibration in the brake pedal, but that's probably > another can of worms...). > > > > any info would be appreciated > > > > thanks a lot. > > > > jim leone > > > >
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