Tweetysuarus
1/2 ton status
Thanx! /forums/images/graemlins/thumb.gif
Bill
Bill
CK5
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Anyone Running Electric Cooling Fan(s)??
- Thread starter ford_assassin
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99firehawk
1/2 ton status
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I have a griffen alunium radiator, Its about 1 1/2 shorter and 1 inch narrower and 1/2 inch thicker then the stocker. Fan fits it perfect. I did have to get creative with the mounting, but that was more for the radiator then the fan, I will try to get some pictures. My setup is kind of back yard enginered and I plan on redoing the mounting over the summer (thats my trucks off season)
dave_90_blazer
1/2 ton status
can you get some measurements of the windstar fan assm.?
thanks
thanks
88Silverado
1/2 ton status
H=18", W=31", D=6"(left fan) 4"(rt fan)
Maybe a stupid question, but how are they wired up? Do you use a self contained thermostat setup, or does an EFI computer figure out when to turn them on?
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Heres a picture of the winstar fans on my Elcamino.
The radiator is the same size as my Blazer.
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That setup looks great. How was the install? Did it just screw right in or what? Anyone know if the '88 rad is the same size as my '83?
Thanks!
Heres a picture of the winstar fans on my Elcamino.
The radiator is the same size as my Blazer.
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That setup looks great. How was the install? Did it just screw right in or what? Anyone know if the '88 rad is the same size as my '83?
Thanks!
In an early dual fan setup, the ECM turns the first fan on and off, but AC and high temperature are also "monitored" by sensors, which govern both the second fan, and the first fan in the case of an AC "override". The ECM doesn't have anything to do with the AC and high temperature switching, those are just temperature and I think head pressure switches.
Later stuff also has a high speed function built into the ECM's that shuts the fans off regardless over a certain MPH.
Great thing about these setups, is that you can eliminate the head pressure switch (if not running AC like me), there are a multitude of different temp rated switch temperatures you can get, and the ECM can be re-programmed with the on/off temperatures of the first fan.
Later stuff also has a high speed function built into the ECM's that shuts the fans off regardless over a certain MPH.
Great thing about these setups, is that you can eliminate the head pressure switch (if not running AC like me), there are a multitude of different temp rated switch temperatures you can get, and the ECM can be re-programmed with the on/off temperatures of the first fan.
88Silverado
1/2 ton status
There are several ways to wire them up.
In my case I wired each fan into a 50A relay, then tied the two relays together so a single 12V source turns them both on at once. I used a thermal switch in the block (on-205, off-195) and also connected a lead from the AC to turn them on when the AC is on. Since they are on my 71, no ECM.
Heres a LINK to the way I have them wired which I will probably be making a similar setup on the blazer. Would like to have the ECM shut them off over a certain speed.
Mounting on my 71 was very easy. I havnt given much thought to the blazer However, Sandman has installed them and maybe he can give some pointers. Im sure using some small angle brackets will work fine.
Dorian, I would like to know how input to the ECM or reprogramming it to control the fan above a certain speed is done /forums/images/graemlins/thumb.gif
In my case I wired each fan into a 50A relay, then tied the two relays together so a single 12V source turns them both on at once. I used a thermal switch in the block (on-205, off-195) and also connected a lead from the AC to turn them on when the AC is on. Since they are on my 71, no ECM.
Heres a LINK to the way I have them wired which I will probably be making a similar setup on the blazer. Would like to have the ECM shut them off over a certain speed.
Mounting on my 71 was very easy. I havnt given much thought to the blazer However, Sandman has installed them and maybe he can give some pointers. Im sure using some small angle brackets will work fine.
Dorian, I would like to know how input to the ECM or reprogramming it to control the fan above a certain speed is done /forums/images/graemlins/thumb.gif
burning PROM's
That's the very basics of what it takes to "get inside" the PROM, and make changes you want.
lots more reading there.
That's the very basics of what it takes to "get inside" the PROM, and make changes you want.
lots more reading there.
88Silverado
1/2 ton status
Thanks /forums/images/graemlins/thumb.gif
[ QUOTE ]
There are several ways to wire them up.
In my case I wired each fan into a 50A relay, then tied the two relays together so a single 12V source turns them both on at once. I used a thermal switch in the block (on-205, off-195) and also connected a lead from the AC to turn them on when the AC is on. Since they are on my 71, no ECM.
Heres a LINK to the way I have them wired which I will probably be making a similar setup on the blazer. Would like to have the ECM shut them off over a certain speed.
[/ QUOTE ]
Do the fans really pull 50 amps? Why do you need them to go on with the AC, isn't temp really all you care about?
Can you tell me more about the thermal switch? Is it really in the block, or is it the intake? I will be installing GM TBI on my 83 shortly, but I understand that the ECM for TBI did not control fans, so I'd have to rig something else up. The TBI/ECM requires a coolant temp sensor in the intake. I guess I'm not really sure if there is someplace else to plug in another temp sensor. Or can I work off of the one that goes to the guage somehow?
There are several ways to wire them up.
In my case I wired each fan into a 50A relay, then tied the two relays together so a single 12V source turns them both on at once. I used a thermal switch in the block (on-205, off-195) and also connected a lead from the AC to turn them on when the AC is on. Since they are on my 71, no ECM.
Heres a LINK to the way I have them wired which I will probably be making a similar setup on the blazer. Would like to have the ECM shut them off over a certain speed.
[/ QUOTE ]
Do the fans really pull 50 amps? Why do you need them to go on with the AC, isn't temp really all you care about?
Can you tell me more about the thermal switch? Is it really in the block, or is it the intake? I will be installing GM TBI on my 83 shortly, but I understand that the ECM for TBI did not control fans, so I'd have to rig something else up. The TBI/ECM requires a coolant temp sensor in the intake. I guess I'm not really sure if there is someplace else to plug in another temp sensor. Or can I work off of the one that goes to the guage somehow?
The fans shouldn't use 50 amps and when you turn the A/C on you wan't the fans to come on also because they will help keep everything cool and mainly you need air pulled through the condensor to cool the freeon so your A/C air is cold when it comes out the vents.
All GM applications I am aware of use intake coolant temp for ECM/fan input.
I would bet that the temperature sender fitting on the PS head could be used, but that might see a higher temperature than what the sensor is "supposed" to see.
Did the TBI Camaro's similar vintage run electric fans? If they did, I'd be willing to bet the ECM can be setup to run it.
I would bet that the temperature sender fitting on the PS head could be used, but that might see a higher temperature than what the sensor is "supposed" to see.
Did the TBI Camaro's similar vintage run electric fans? If they did, I'd be willing to bet the ECM can be setup to run it.
88Silverado
1/2 ton status
The fans will pull a bit of current on initial turn-on. The steady state is probably around 20A. I like a little margin in the relays therefore I got 50A. You need airflow over the air condensor in order to get cool air out of the vents. I tried originally not having the fans wired to the air but realized quickly in the summer, when sitting in traffic, the air was warm until the fans came on. Thats why I wired them up to the air switch. Most cars will turn the fans on when the air is engaged.
You want them to turn on with the AC so the condensor gets cooled. I didn't do this because I just turn them on when I turn on the AC. My fans are on-off-automatic on a switch. In the automatic setting it gets to 225° before turning them on.
GM fans found on the Cutlass Cieras, Pontiac 6000s, et cetera seem to take 9-11amps continuous and peak at about 25amps startup and under load (like circulating water instead of air /forums/images/graemlins/eek.gif ).
Ford 3.8L single speed single fans (found on Taurus and some of their other junk) take about 17amps continuous and 25amps startup.
I'd been running one of my fans off a 30amp headlight relay and it died at Christmas break (took about nine months to bite the dust). I recommend running a 40amp relay for a fan. I'm hoping it'll last longer.
I have my fans daisy chained if you're wondering (one fan relay triggers the second). I did that to simplify wiring. I recommend harvesting the relays that were on the vehicle if you can.
GM fans found on the Cutlass Cieras, Pontiac 6000s, et cetera seem to take 9-11amps continuous and peak at about 25amps startup and under load (like circulating water instead of air /forums/images/graemlins/eek.gif ).
Ford 3.8L single speed single fans (found on Taurus and some of their other junk) take about 17amps continuous and 25amps startup.
I'd been running one of my fans off a 30amp headlight relay and it died at Christmas break (took about nine months to bite the dust). I recommend running a 40amp relay for a fan. I'm hoping it'll last longer.
I have my fans daisy chained if you're wondering (one fan relay triggers the second). I did that to simplify wiring. I recommend harvesting the relays that were on the vehicle if you can.
[ QUOTE ]
Great thing about these setups, is that you can eliminate the head pressure switch (if not running AC like me), there are a multitude of different temp rated switch temperatures you can get, and the ECM can be re-programmed with the on/off temperatures of the first fan.
[/ QUOTE ]
Do you happen to know what those different temperature switches fit or part numbers or anything? All I've found with a NPT fitting is the common 108°C (225°F) that GM put on virtually every front wheel drive car pre-OBDII. I have mine mounted with a reducer into my waterneck.
Great thing about these setups, is that you can eliminate the head pressure switch (if not running AC like me), there are a multitude of different temp rated switch temperatures you can get, and the ECM can be re-programmed with the on/off temperatures of the first fan.
[/ QUOTE ]
Do you happen to know what those different temperature switches fit or part numbers or anything? All I've found with a NPT fitting is the common 108°C (225°F) that GM put on virtually every front wheel drive car pre-OBDII. I have mine mounted with a reducer into my waterneck.
No idea on part numbers. Just know a guy that is into GM's who has seen these in a Delco catalog.
In actuality though, I *think* the Camaro's changed the temp on the "early" to "later" setups. Haven't had to dig into it yet. Any of the early "corporate" engines might be a possible donor, but like you said, some of those aren't going to be NPT.
2.8, 3.1, 3.8 applications are some that I can think of that may be worthwhile to investigate.
In actuality though, I *think* the Camaro's changed the temp on the "early" to "later" setups. Haven't had to dig into it yet. Any of the early "corporate" engines might be a possible donor, but like you said, some of those aren't going to be NPT.
2.8, 3.1, 3.8 applications are some that I can think of that may be worthwhile to investigate.
84_Chevy_K10
Banned
Some guy today at the World of Wheels, representing Spal had told me that a single 16" fan can cool our trucks off road, even wheelin' the piss out of them all day long.
20 amps a piece, $200, but I just might try it. I'm just not that convinced that one fan can really do it though.
20 amps a piece, $200, but I just might try it. I'm just not that convinced that one fan can really do it though.
I run two 14" fans without any problems.
