How one can know is a fan is pusher or puller?, my blades are facing this way

!
Front of car ! \
! \ <Fan
! \
! \
!

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Mopar Muscle is well defend by Slant Six!

Valiant Duster 1971

Avenger air flow is always from front to back of the car, otherwise you would be blowing air opposite its natural movment as you drive down the road. If the fan is between the radiator and grill, then it is a pusher, if it is between the radiator and engine, it is a puller.

Tex, I did an electrical fan swap in my Duster a couple years ago. I swiped the electrical fan, relay, and thermal switch out of a junkyard Cherokee. The radiator is stock.

While the wiring looks a little cheesy to me now as I review what I did, the install works fine, and has no trouble keeping the engine cool. I live down the road from you in Casa Grande, so our weather is about the same. Only thing is, I don't have A/C on it.

Here's the how-to on it: http://ramchargercentral.com/index.php? ... show;id=19

I wired it to run with the key on, temperature dependednt. The other options discussed here would be fine as well. In my Ramcharger, I have an electric fan wired to run all the time depending on the temp sensor ($17 Permacool unit from the parts store). It runs from a second battery though, so if I get the "3rd worldly" relay stick, it doesn't drain the main battery. It is nice to have it run for a few minutes after shutdown to help the heat-soaked engine compartment.

HTH -

-George

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It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

Hey gunpilot! thanks about the 3rd world relay remarks!

No sweat, I'm just trying to pick up an argument... and my wife woke up surprisingly cool this morning

I guess that pullers are more efficient because they don't steal any cooling area from the front of the radiator, where the air comes thru. With fans on, prolly the flow is about the same, but fans off, not having a flow restrincting device installed on the rad front has to make a diffrence.

take care.
JIC

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

LOL - sorry man - but I was just quoting Dan. But I'm sure he wasn't including Argentina in any list of poor-quality-relay-producing countries.

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It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

Relay? what's a relay (average argentinian electro-automotive manufacturer's question)

I´m sure Dan ain´t quoting us on that list... we don´t produce relays at all...

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

That's right. When I rant about "third-world garbage", I mean China.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Gunpilot - I wanted to take a look at your setup however the link you provided doesn't come up. Neither does ramchargercentral.com. Was mainly interested in how it was wired.

Works fine for me. The site might have had a stomach ache for a while.

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It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

For Gunpilot - I changed the link to reflect the upper case letters where needed and got in OK. Nice write-up on the cooling fan upgrade!

Ok here's the skinny. We installed the fans this weekend and I finally test drove it yesterday evening. I went to the local Checker auto parts and they had Hayden and Flex a lite. I also went to the local Pull Your Part but it was so darn hot I didn't have the patience to pull anything except a piece of interior trim and an "idle stop" off a Chevy which I need to rig up once the AC is up and working. I have a Holley 5200 retrofit carb with no AC idle stop.

So the Flex A Lite fans were nice but the ones they had in stock all were too deep. They had a nice dual 12 inch model but it was a pusher and wouldn't fit. They had a Mustang model puller with 2800 CFM's but it was 4 1/4 deep and I only have about 3 3/4 inches. So I bought two of the Hayden fans and a controller. Also bought a switch for manual override and another relay for the AC as dan suggested. I put the 14 inch fan as a puller and the 10 inch as a pusher. The controller sensor is installed in a port on the top tank of the radiator ( not sure if thats the best place). I ran the controller ignition control to permanent 12 volts. Fired it up and voila it works great.

But the fan ran for 15 minutes or so after engine shutoff and I think that is too long or the CFM's are not enough to cool it good enough. Both fans add up to 1800 CFM's BTW. Also when I was driving it last night at cruising speed I don't think the fans were coming on at all which means the ram air effect is enough to keep the radiator cool. But when I shut the car off the fans came on automatically after a few minutes because the engine heated up. I have the controller set pretty high. I'm guessing it's set around 190 or so.

One other note is I haven't run the car in a few weeks and I have been doing electrical testing including horn and radio fixes. I noticed the alternator charging meter is siting at about 1 o'clock. When the fans come on while the car is running it goes even higher to about 2 o'clock. Not quite full scale but close. So I'm wondering if I just need to drive it a while or am I approaching the limit of what the alternator can put out. Since I can tell when the fans come on by watching the meter and I can see that while they are off I'm still high on the meter. So it should be no different then before the install. Also I'm wondering how much load the AC clutch will have?

So the dilema is do I hook the controller to ignition switched voltage? Being that it's so hot here I'm tempted to cook up a timer circuit but I don't have the patience right now. I'll post some pics today of the final install later today.

Thanks for the help everybody.

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Sweet Emotion

Odd, I cut and pasted my link from the page. Anyway...

Tex, with the sensor in the tank like that, it will take a long time for that water to cool down as it is no longer being circulated by the water pump. You may either want to connect your 12v to a switched source, or you could install a switch (on-off-auto?) to control it.

In my RC, I use the thermocouple that clips to the radiator fins. There, the fan runs for about three or four minutes before the water in that area of the radiator cools off, and the fan switches off.

-GH

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It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

maybe your rad is overfilled. I had the same issue when I first installed my electrofans till I discovered that when car was hot (and I mean hot) the water level was too high, causing the fan to run for like 10 minutes after shutoff .

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

I didn't think it was possible to overfill a radiator. It is full to the brim. I could release a little coolant.

Thanks.

The link worked fine for me BTW.

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Sweet Emotion

I think the bottom of the radiator is the best place for a sensor.

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
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