Hi list! I have bought the Hypertech low-temp fan switch at the Fiero Store, hoping that it will keep me from having to switch on the A/C all the time in traffic. Wanting to install it I found that the cabling is different to the stock switch: it has just one cable vs. two on the stock switch. Who can help me with the installation process?
Make sure you have the correct switch on the manifold. It will be the left sensor next to the thermostat housing. The right one is the cold start switch. I just changed the fan switch, the plug is a squeeze together and has a single connection in the center of the plug to connect to the switch. I also think you need a 19mm socket to remove the fan switch and a 15/16 socket to remove the cold start.
From left to right: ECM temp sender, fan switch, and cold start injector. Someone may have in the past move these around, but you can tell which is which by looking at the connector. The only fan switch that came with two wires was the '84 with the two speed fan.
JazzMan
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11:59 AM
foxgapfiero Member
Posts: 2445 From: Bangor PA USA Registered: Sep 2001
I wish my manifold was that clean BTW the switch I use is from a turbo 3.8 from somewhere in the 80's. The fan comes on at 200 degrees. It warms the car up nice in the winter and keeps it cool in the summer. I use the 195 thermostat.
[This message has been edited by foxgapfiero (edited 01-11-2004).]
Yes! Make absolutley sure you get the right one! Only the fan switch has one wire. I accidently pulled the Coolant temp switch and put the fan switch in there. ECM freaked out, car barely ran, and $210 later I found out the one I wanted to replace was 3" away.
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01:32 PM
Carrolles Member
Posts: 2799 From: Alabaster, AL USA Registered: Apr 99
I bought mine from Rodney Dickman. I put 200 degree switches (I have 195 degree t-stats in both) on my 85SE v-6 and my 85GT and love them. No more turning on the A/C in traffic to keep the engine temps down.
Per Rodney's instructions, if the engine is cold you do not have to drain any coolant to replace the switch. I found this to be true on both cars. It sure was nice not having to fool with draining coolant and refilling/burping later.
I wish I had discovered this in 1997 when I bought my first Fiero.
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01:42 PM
Jan 18th, 2004
yellowstone Member
Posts: 9299 From: Düsseldorf/Germany Registered: Jun 2003
Hi list! I have bought the Hypertech low-temp fan switch at the Fiero Store, hoping that it will keep me from having to switch on the A/C all the time in traffic. Wanting to install it I found that the cabling is different to the stock switch: it has just one cable vs. two on the stock switch. Who can help me with the installation process?
Thanks fron rainy Düsseldorf/Germany.
Hey! I installed the switch today and went to a test-drive... The fan doesn't come on until the dial is almost in the red. Did I do something wrong? The switch seems to work, otherwise the fan wouldn't come on at all, right? (I'm not switching on the A/C) But why does it get so hot before it does? Any ideas?
Hey! I installed the switch today and went to a test-drive... The fan doesn't come on until the dial is almost in the red. Did I do something wrong? The switch seems to work, otherwise the fan wouldn't come on at all, right? (I'm not switching on the A/C) But why does it get so hot before it does? Any ideas?
It's possible that your guage is way off. When you installed it, did you screw it right in without using any pipe tape?
Dave
Jus Just
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07:42 PM
Jan 19th, 2004
yellowstone Member
Posts: 9299 From: Düsseldorf/Germany Registered: Jun 2003
Yes, I used teflon tape. Was that a bad idea? I thought that this is what I should do to stop leakage. Is a copper ring better?
Thanks
The connection between the sensor and the intake is the ground path. If you used teflon tape it may no be making a good connection. Go to the auto parts store and by the correct sealer for sensors and see it that takes car of the problem.
Yes, I used teflon tape. Was that a bad idea? I thought that this is what I should do to stop leakage. Is a copper ring better?
Thanks
That's probably why you have a problem. Like said above, the switch grounds to the block thru the threads, so with the tape there, you probably aren't getting a good ground.
I put mine in without anything on the threads and it doesn't leak. Just remove it, take off the tape, then put it back in. Don't tighten it down too tight or you'll break it (I did this once). The threads are tapered, so it won't go in all the way. I think it only screws in about 1/2 of the way to get it real tight.
good luck Dave
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11:38 AM
Jan 24th, 2004
yellowstone Member
Posts: 9299 From: Düsseldorf/Germany Registered: Jun 2003
The connection between the sensor and the intake is the ground path. If you used teflon tape it may no be making a good connection. Go to the auto parts store and by the correct sealer for sensors and see it that takes car of the problem.
I see frequently that people say teflon tape will prevent a good ground connection thru the threads,but i find it hard to believe.Tightening the fitting to a sensible torque should cut thru the teflon tape.Has anyone ever tried this and checked it with a good ohm meter? inquiring minds want to know
I used teflon-based pipe dope on all my sensors and they work perfectly. I cannot see how the teflon tape could be strong enough to maintain a barrier at the points of metal contact, especially in a tapered pipe thread application.
