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  #1  
Old 08-25-2002, 07:33 PM
Ivo Tyl
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Continuos run of aux.fan

Suddenly,after two years of a normal service, my aux.fan is unable to stop even if the key is out and the engine is cold.I had to disconect the cable which is all time hot .
How this is possible?Is it a problem with thermostat or the pressure switch?Please help.
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  #2  
Old 08-25-2002, 10:06 PM
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Location: Holly Springs, GA
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Sounds like the temp sensor has gone south.

Replace it.
Mine went bac a coupld months back too.....it happens
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  #3  
Old 08-25-2002, 10:11 PM
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I would think that the relay contacts are stuck [ welded ] shut.

Look around for the relay and unplug it..

Doubt it to be a shorted sensor cuz the feed for the coil side of the relay [which is sensor fed] is usually off with key..

Don't have that schematic handy....
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  #4  
Old 08-26-2002, 01:35 AM
MVK MVK is offline
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Bad Aux fan relay is what it looks like.
Pull out the relay and tap it gently all around with a small plier or back of screw driver. see if that would loosen the contact. and help restore the relay. Just to be sure borrow one from a friends car and plug it and see if solves the problem, then you know its the relay for sure.

MVK
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  #5  
Old 08-26-2002, 09:21 AM
NIC
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Guys, can you tell me where to find the relay and temp sensor for the aux fan? Mine seems to work fine sometimes and other times, even when its hot and the A/C has been on a while, it does not come on. I expect its one of the items above.

Nic
'85 300CD @ 152k miles
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  #6  
Old 08-26-2002, 09:58 AM
MVK MVK is offline
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Hi NIC;
Look in the performance product web site under your model. Search for key word relay, it will bring you a list of all relays, pick the Aux fan relay, and it will open a picture with location of various relays. Its also called icecube relay as it looks like the ice cube size.

MVK
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  #7  
Old 08-26-2002, 01:15 PM
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This has happened to my fan several times. Each time, the problem was the 100 C switch that reads the coolant temperature. I can only tell you the location of it for 84 190's (it is in the housing that holds the water pump) -- they moved it in 85 to the other side of the block.

I have yet to experience a stuck relay (i have blown a couple of relay fuses). The problem has always been the same.
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  #8  
Old 08-27-2002, 11:51 PM
Ivo Tyl
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aux.fan

Dear members of forum, thanks.May be I solved it..Unfortunately the ************************ did not help,probably they do not have fan relay on stock and I could not find where it is.By using yours description as an ice cube a cold box in mind,I connected the fan.It ran with key aut and cold engine.Then I tapped all relay in the fuse box,it continued to run.Then I have unpluged one by one,the centre one in the front row,when unplugged, stopped the fan.I tapped it from all side,return in the place and fan was off.May be that is all needed.Next day I have to check if it runs when hot engine.
So thanks to our fraternity,NICK thanks for e-mail.Ivo
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