electric fan help.....

808Gt · May 12, 2008

I just recently bought a Ramcharger style fan it was from a concord... well I wanted to know, is the fan supposed to be pulling air in or blowing air toward the radiator?

I hooked up the two colored wires (yellow and green) to the positive and the black wire to the negative, and it is pulling and not blowing... this will be my first time doing and electric fan so any help would be nice

Im also making a fan controler and wanted to know about the relays to use, can I use just 2 - 40/30amp auto relays? or would I need the 75amp relay on http://www.geocities.com/smithmonte/Auto/MarkVIII_Fan.htm

HISSIN50 · May 12, 2008

The fan should pull air (from the front of the car towards the engine block).

Are you only going to run high speed with your fan? Those little motors have a pretty decent draw.

808Gt · May 12, 2008

HISSIN50 said:
The fan should pull air (from the front of the car towards the engine block).

Are you only going to run high speed with your fan? Those little motors have a pretty decent draw.

ok, though that the fans were supposed to be blowing If I can get it to do low/high then that be good... but Im following this diagram:
View attachment 318127
I mean I dunno how I could get it to do low speed also...

also I did a test run today not hooked up to the car, but on a power supply and just used a solder gun on the thermal switch and it worked surprised me I thought it was cool

Killer50stang · May 12, 2008

HISSIN50 said:
The fan should pull air (from the front of the car towards the engine block).

Are you only going to run high speed with your fan? Those little motors have a pretty decent draw.

You can actually do both if you have two fans. I did a pull and a push. I put one fan the the back and the other on the front of my radiator and it ran cool. I had cooling issues due to my blower. Heres a vid:

http://www.pothsprojects.com/videos.htm

808Gt · May 12, 2008

Killer50stang said:
You can actually do both if you have two fans. I did a pull and a push. I put one fan the the back and the other on the front of my radiator and it ran cool. I had cooling issues due to my blower. Heres a vid:

http://www.pothsprojects.com/videos.htm

that looks cool..

HISSIN50 · May 12, 2008

I'm well aware that one can use a fan as a pusher or puller.
Having a fan pushing air can be an issue since the fan housing is an impediment to ambient airflow while at speed. Generally when one adds a pusher fan (often to help a puller fan with the extra heat from AC), it's a small electric pusher fan, not a large one. This is for the reason mentioned above.

I would not start out to do a pusher fan - it's only added if nothing else cuts it.

As for the wiring, if you have a second Gen Intrepid fan, IIRC you wire up both the low and high speed wires to 12 volts to actuate high speed. WIth the first generation Intrepid fans, you wire low or high but don't have both active at the same time.

In case it helps, here's an install article (with a Dc Controller however).

Good luck.

NIKwoaC · May 12, 2008

HISSIN50 said:
I'm well aware that one can use a fan as a pusher or puller.
Having a fan pushing air can be an issue since the fan housing is an impediment to ambient airflow while at speed. Generally when one adds a pusher fan (often to help a puller fan with the extra heat from AC), it's a small electric pusher fan, not a large one. This is for the reason mentioned above.

I would not start out to do a pusher fan - it's only added if nothing else cuts it.

...

+1

The only guys I've heard of putting their fans on the front and using them as a pusher do it for space concerns in the engine bay. Also, most fan blades are designed to efficiently move air in one direction only, so spinning it the wrong way would likely be ineffective.

I'm on my girlfriend's Mac and I can't watch the video for some reason... But a double fan setup sounds interesting...

808Gt · May 13, 2008

NikwoaC said:
+1

The only guys I've heard of putting their fans on the front and using them as a pusher do it for space concerns in the engine bay. Also, most fan blades are designed to efficiently move air in one direction only, so spinning it the wrong way would likely be ineffective.

I'm on my girlfriend's Mac and I can't watch the video for some reason... But a double fan setup sounds interesting...

ok, thanks for the info. I just had the impression that it was supposed to be a pusher lol...

the video just shows one fan in the engine bay and the other in the front side of the radiator, i think it was on separate sides dont remember, and i cant watch the vid 2 now..

808Gt · May 13, 2008

hissin - I have the newer style... well i followed the drawing and just connected the 2 colored wires on 87 and worked good, wanted to know why you need to tap in to the ac wire?

Killer50stang · May 15, 2008

808Gt said:
that looks cool..

It was and did the job very well. I had to do this because I didn't have clearance to get my fan dead center, so I just put one on each side. Did the job.

Jason

HISSIN50 · May 15, 2008

808Gt said:
hissin - I have the newer style... well i followed the drawing and just connected the 2 colored wires on 87 and worked good, wanted to know why you need to tap in to the ac wire?

So the fan comes on when the AC is on. The heat rejected through the condenser stresses the rest of the cooling system.

808Gt · May 16, 2008

HISSIN50 said:
So the fan comes on when the AC is on. The heat rejected through the condenser stresses the rest of the cooling system.

ok ok, I see...
so this setup it is just gonna be on high speed and not vary from low to high? well my car is stock but just wanted to put the fan on and take out the stock fan since it is getting all cracked etc. wear and tear.. it should work fine with me just using regular relays yea?

HISSIN50 · May 16, 2008

808Gt said:
ok ok, I see...
so this setup it is just gonna be on high speed and not vary from low to high? well my car is stock but just wanted to put the fan on and take out the stock fan since it is getting all cracked etc. wear and tear.. it should work fine with me just using regular relays yea?

I think you've got it. You'll note that in the diagram shown above, the low speed fan terminal is not even connected to the wiring. The fan is on high speed if it's on at all.

One relay has the fan come on high speed when the thermal switch tells it to.
The other relay allows the fan to come on when the AC is turned on (or a manual switch input tells it to turn on).

808Gt · May 16, 2008

HISSIN50 said:
I think you've got it. You'll note that in the diagram shown above, the low speed fan terminal is not even connected to the wiring. The fan is on high speed if it's on at all.

One relay has the fan come on high speed when the thermal switch tells it to.
The other relay allows the fan to come on when the AC is turned on (or a manual switch input tells it to turn on).

ahhh ok,
so is there a way to make it were I can have high and low speed with this set up?

HISSIN50 · May 16, 2008

808Gt said:
ahhh ok,
so is there a way to make it were I can have high and low speed with this set up?

You could but since those fans are made for smaller engines, I'd probably just want to run them on high speed.
Otherwise, you could use the relay with the temp probe to control low speed. Then have the other relay command the high speed fan terminal. But then what if low isnt cutting it? You'd have to watch the guage and have a manual override.

808Gt · May 16, 2008

HISSIN50 said:
You could but since those fans are made for smaller engines, I'd probably just want to run them on high speed.
Otherwise, you could use the relay with the temp probe to control low speed. Then have the other relay command the high speed fan terminal. But then what if low isnt cutting it? You'd have to watch the guage and have a manual override.

ahh ok I see...
thanks for your help Hissin

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