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Discussion Starter #1
Has anyone ever done this? I use my 95 caprice for work, making deliveries so I am constantly sitting at traffic signals or idling outside of delivery locations. I don't like the high temp setting that these cars come programmed before the fan kicks in, I have heard of having the computer reflashed but this is my only car and I can have it down more then a day. I'm looking for any insight on how I can wire in a toggle switch so I can flip the fan on when in traffic or when at the delivery. I appreciate any help that can be offered.
Phil
 

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There's a bunch of ways to accomplish this with one,or both fans. Manually grounding the fan(s) relay will cause the fan(s) to come on. The schematic of the underhood fuse center might be helpful,though one should be able to identify the circuit(s) without one...
 

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Re-flash your PCM for lower temps. There is no need to have your car "down" or to send your PCM anywhere. It's OBD 1. Forget the switch idea.
 

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Discussion Starter #4
Re-flash your PCM for lower temps. There is no need to have your car "down" or to send your PCM anywhere. It's OBD 1. Forget the switch idea.
how do i reflash it? I was under the impression it had to be sent out to a specialty company
 

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The problem with a switch is that you will eventually forget to turn it off. If your AC system is in working order, the fans should kick on when you turn on the AC.
 

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The problem with a switch is that you will eventually forget to turn it off.
Are there any drawbacks to this?

I've let people borrow my car before for hours or even days at a time, and I just leave the switch on before they take possession. Easier then telling people to watch the temp gauge and hoping they remember. It's been rigged with a manual switch for over 10 years and never an issue. I would rather have it run cool than worry about letting it overheat
 

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Aside from wearing out the fans really quick? Just because they still spin,doesn't mean they're still moving the amount of air they're supposed to. Generally,it's a bad idea to run the fans all the time (unless it's an emergency),but loaning out one's car to others is an even worse idea in my experience. The load the fans place on the electrical system when running constantly is substantial,and likely to overheat wiring,connectors,relays,etc,etc...
 

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Aside from wearing out the fans really quick? Just because they still spin,doesn't mean they're still moving the amount of air they're supposed to. Generally,it's a bad idea to run the fans all the time (unless it's an emergency),but loaning out one's car to others is an even worse idea in my experience. The load the fans place on the electrical system when running constantly is substantial,and likely to overheat wiring,connectors,relays,etc,etc...
Valid points. I still wouldn't worry about it. Like I said, I've never had a problem. Maybe I'm just lucky? I think as long as you pay attention to your gauges you won't forget to turn it on/off. That being said, a reflash is the best option simply for peace of mind, if nothing else.
 

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My car has a switch, no clue how it's wired though because it was there when I bought the car. It doesn't override the PCM, it just allows you to turn the fans on manually at any time, ie staging lanes for drag racing. Still a good idea to have the PCM retuned for fans and a bunch of other things. Pick your mail order tune of choice or maybe hit up Nab (Blue Wail) if you're near him in MD.
 

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Discussion Starter #11
My car has a switch, no clue how it's wired though because it was there when I bought the car. It doesn't override the PCM, it just allows you to turn the fans on manually at any time, ie staging lanes for drag racing. Still a good idea to have the PCM retuned for fans and a bunch of other things. Pick your mail order tune of choice or maybe hit up Nab (Blue Wail) if you're near him in MD.
I'm in anne arundel county, my biggest issue is this is my only car so I can't be without it longer then a day
 

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I purchased my tuned PCM outright from http://pcmperformance.com ,and swapped it out with my stock one after it arrived.
 

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Or, you could have pcmperformance.com mail you the tune and install it yourself in about 10 minutes in your driveway like I did. Cheaper, easier, no downtime.
 

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I'm in anne arundel county, my biggest issue is this is my only car so I can't be without it longer then a day
You could probably pick up a used PCM for $50ish and send that out for a tune. Try posting a request in the parts wanted section. I'm sure someone has one to sell...
 

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I purchased my tuned PCM outright from http://pcmperformance.com ,and swapped it out with my stock one after it arrived.
^^^^^^This.^^^^^^

This is your best option since you can't have your car down for any length of time. Or you could dump the program yourself but it will cost you for the convenience if you want to have the lowest downtime, ($600). But your car will only be down for as long as it takes to dump the program, granted if you don't brick your ECM, then you might have an issue. ;)

Curtis
 

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For tuning software,and licensing....I doubt you'll want to go this route just for fan temps. There's also stand alone fan controllers (I have one in my C/K tuck) from Dakota Digital (my favorite),but there are others.
 

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I wanted to clarify, when I said keeping the toggle switch on and always running the fans, I didn't mean literally all day 24/7. The fan switch on my Camaro only has power when the ignition is on. If you turn off the car, the fan turns off even if the switch is still in the "on" position.

I thought about this today, because I realized the switch is different on my Caprice. Apparently it will power the fan at any time even if the ignition is off.
 
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