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Registered
Join Date: Oct 2004
Location: Bay Area, California
Posts: 18
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Aux fan not running after tests done 89 325i
Hi, I am trying to figure out why the aux fan doesn't turn on when the temp is at red hot. I tested it with a jumper wire and it runs fine at high and low speed. I then replaced the thermo switch to a new one thinkin it's faulty and still doesn't run even when the reading on the temp guage is at red. The radiator is about a year old and it is not clogged or anything. I also replaced the water pump and thermostat and temp gauge still reads overheating. Should I switch out the thermostat to a lower degree one? please help, thanks.
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1989 325i |
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12-24-2004, 11:13 PM
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Join Date: Oct 2000
Location: Nor-Cal
Posts: 4,403
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I don't know why your aux fan isn't coming on, but if your car is reaching the red-hot mark during the Winter in the Bay Area, than something isn't working right.
I can barely get my e30 to reach the half way mark after hard driving. |
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12-25-2004, 07:22 AM
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Join Date: Oct 2004
Location: Bay Area, California
Posts: 18
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Kia Ora, well, I just placed an order for a new thermostat and temp sensor with Pelican and see if that will help. Will post outcome by next week if anyone does read this. later...
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1989 325i |
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12-30-2004, 10:00 AM
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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,459
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Did you make sure you bled all the air out of the system? These cars can be a ***** to bleed... And air in the system would cause this...
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12-30-2004, 11:11 AM
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Join Date: Oct 2004
Location: Bay Area, California
Posts: 18
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Hey Jared, I loosened the screw on top of the thermostat housing to bleed the air out. I will try flushing out the system and check everything to make sure nothing is clogged when I get the new thermostat. Hopefully that will work. thanks
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1989 325i |
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12-30-2004, 12:06 PM
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Join Date: Oct 2004
Location: Bay Area, California
Posts: 18
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well, overheating problem solved, aux fan still not running though.
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1989 325i |
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01-04-2005, 04:02 PM
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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,459
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What was the problem?
On my own fan, I found that the switches only kick onb at a ridicoulosly high temp, so I re-wired the connector to a manual switch on the dash to allow me to turn it on when needed. I also wired the switch so that when the A/C is on, it always blows at high speed. This has helped the A/C blow colder as well.. |
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01-05-2005, 06:57 AM
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Registered
Join Date: Oct 2004
Location: Bay Area, California
Posts: 18
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When the engine temp was at red, the aux fan never turned on even after I bought a new one. I also tested the switch with jumper wires and it works. It just dosn't turn of on its own at high temperature. Your idea with a manual switch is really cool. Did you use a 3 way switch to control high and low speed? Thanks Jared.
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1989 325i |
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01-05-2005, 09:02 AM
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