[fiesta62]

hi, i have another thread going about aluminum rads to solve the issue of heat at idle but i am now thinking electric fan or fans may be the cure for my overheating problem at idle, i think 1 large electric fan would be best like say 19 inch if possible, car is fine when moving 180 all day or less, let it idle and gets to 210 easy and more, after lots of research it all seems to be the car needs more airflow at idle, can anyone recommend what electric fan or fans would be best i need as much cfm as possible, thanks

[Goatracer1]

You didnt say what size radiator you have. I have the AC rad in my 1967 GTO and I am using a electric fan from a 2001 Grand Cherokee.

[fiesta62]

I have the standard non AC rad in car, 4 row, core size 25.5 inch x 15.3 inch by 3 inch thick, but I have fitted the larger AC shroud

[frbformula]

What are you using to check the temp? I chased a "over heating" problem all summer and in the end it turned out the new sending unit was giving the wrong ohm readings for the factory gage. I temporarily installed a mechanical temp gage and it turns out the car was not even close to over heating.

[67ramairowner]

Originally Posted by fiesta62

hi, i have another thread going about aluminum rads to solve the issue of heat at idle but i am now thinking electric fan or fans may be the cure for my overheating problem at idle, i think 1 large electric fan would be best like say 19 inch if possible, car is fine when moving 180 all day or less, let it idle and gets to 210 easy and more, after lots of research it all seems to be the car needs more airflow at idle, can anyone recommend what electric fan or fans would be best i need as much cfm as possible, thanks

Lincoln Mark VIII. Around $70 NEW from Rock Auto. Matches up very well to the overall dimensions of our radiator. Understand going in that NO fan is a cure for a plugged up tired out radiator core. MKVII has two speeds (some models) Look at posts here on the board there is a fellow with a 67 (maybe 66) Tempest that is running the MK VIII and has great result. I have the same fan cooling an LS6 454 with a Dakota Digital controller.

[fiesta62]

hi, i looked on rock auto could not seem to find the mark v111 fan, are u sure its on there, maybe i am using the wrong search words, i did find a fan motor but no complete assembly, thanks

[67ramairowner]

Originally Posted by fiesta62

hi, i looked on rock auto could not seem to find the mark v111 fan, are u sure its on there, maybe i am using the wrong search words, i did find a fan motor but no complete assembly, thanks

Well it was there but that was some time ago. Perhaps it is not there now? I must tell you I HATE the Rock auto site, that hierarchy for searching thru the models to find parts makes me nuts. Just me I guess? You need to find the vehicle then the section of the vehicle, then the part. As I recall it was a PIA to find "Fan" Seems to me...looking back now, that the "fan" was buried under "Radiator Fan" or something very much more complicated than the simple term "Fan". Radiator Cooling Fan? "Engine Cooling Fan"? "Ceiling Fan"? (just kidding on that one). Try some more out of the box thinking on what the thing as called. I might....and this is a L-O-N-G shot have the part number someplace but it could be hard to find or long gone.

[fiesta62]

no worries I will keep searching, thanks

[67ramairowner]

Originally Posted by fiesta62

no worries I will keep searching, thanks

Also ...there are similar fans used in the Mercury Cougar. The issue with these fans is that some are controlled by the computer, some are two speed and others are one speed. The 1 Speed has the speed varied by a controller / computer that changes the voltage to the windings. The two speeders have two distinct speeds...you want the two speeder not the one speed. Two speed has three wires off the motor...high Speed / Low Speed and Ground. As I said earlier ...press on in the search. I will look for the number if you cannot find what you need.

[fiesta62]

searched rock auto , found 1 fan that looks like the mark v111, its made by , 4 seasons, the part number on rocks site is, 75627, its listed to use in cougar and thunderbirds 1994 to 1997....$100....but does not say what size fan is, or if its 1 or 2 speed, or if it is the mark v111, any thoughts anyone?

[Joel Koontz]

I have been running a Mark VIII fan on my 68 for many years and love it. Works great, pulls a lot of air and I never have any cooling issues. The M8 fan is reported to flow more air than just about anything available.

Although I like the M8 fan a lot, if I were to do it over again I would probably go with a dual fan setup. It would allow some redundancy and if one fan/relay were to fail, it would probably allow me to "limp home" on just one fan. It would also allow me to only run just one of the fans, when only one is needed, and then turn the 2nd fan on only when maximum cooling is needed.

Many people use dual fans from Ford Taurus and Windstars. They are reported to move quite a bit of air also.

[fiesta62]

i think i like the idea of the one fan as it appears i could still fit my standard shroud over the m8 unit just for looks, im trying to keep it looking stock as possible, if i had 2 fans then i think thats going to big a large box style shroud that would look very aftermarket, priority is cooling, but if the m8 does the job then just 1 fan for me is the go.....thanks

[lust4speed]

In another thread I mentioned about my Cruiser running the stock A/C mechanical fan with a 6.5" top pulley. We do also have electric fans.

My son's Firebird and my 67 GTO drag cars are set up to run the Mark VIII fans. His is a two speed fan out of a Thunderbird while my fan is a single speed (but still has three wires) out of a Lincoln. We run his fan on low speed only with an inexpensive thermostatic control module that simply turns the fan on and off through a heavy duty solenoid. There is also a manual switch on the dash to engage high speed if ever needed. The two in-car pics are of his setup.

My drag GTO was running a Taurus fan and it did a good job of keeping things cool, but it came out of a pick-a-part 10 years ago, and recently the motor was starting to make funny noises. My new setup is the pic of the radiator and fan on the garage floor. The single speed fan will be run with a rather expensive Flaming River controller which uses pulse modulation to vary fan speed from 50% to 100%. Not cheap, but the amp rating is double what the Mark VIII pulls so it should last just fine.

The reason for the aluminum radiators is simply that they were inexpensive - around $160 at the time, and these cars are drag race only. The reason for electric fan choice on the drag cars is that I prefer an electric water pump and fan to cool the car off between rounds. The electric pump and fan continue to run after the key is turned off and will bring the engine down to under 150° in less than a minute after the key is turned off (and then they turn off at that temp automatically). After the second time of leaving the fan on and draining the battery, I went with the thermostatic control.

I still believe that the mechanical A/C fan setup is superior for a road car. The electric Mark VIII fan is equal at moving air at idle, but it looses out to the mechanical fan once engine RPM is increased. Also, the fan wiring on the Firebird will be cleaned up as soon as a few new parts arrive from Summit in the next day or two.

[fiesta62]

hi mick....well i ordered my fan today its a 19 inch fan off a mercedes it looks like a big mother fan, similar looking to the m8 but a bit bigger and nice big motor on it i'm confident this time, never had any issues when car is moving its 175 ish , so i am thinking it will still be fine when moving but hope this electric pulls more at idle, my flex fan now spins about 1100 rpm at idle but i would think the electric fan will be around 2000 rpm, so it should mean more air and i know more air is what i need.....might be a week or so before i get time to fit it......

[1967Tempest]

Yup, go Lincoln Mark VIII or Thunderbird fan. I removed the horn and horn bar and massaged the front of the support to fit a Griffin 2 core 1.25" tube rad with the Thunderbird fan. I then use the Hollister Relay set-up. Literally can not get any better set-up.

The fins are not broken, The flash made them look bent, I think my fan got a tad close and swayed them! Best part is I can control when the low speed comes on. SO in the winter, I have it at 180*. In the summer at 170*. This allows the heat to stay warm. I have the low on a variable control and the high on a temp switch in the intake manifold which is set to 195*.

Sorry for big pictures.

Hollister relay kit.

http://www.hollisterroad.com/proddet...?prod=MarkVIII

They also offer a PWM controller as well now.

[fiesta62]

received the Mercedes fan looks good will fit soon and fingers crossed,

[1967Tempest]

Originally Posted by fiesta62

received the Mercedes fan looks good will fit soon and fingers crossed,

Pics of the fan and model number etc.. I am looking for a good fan for my 86 F-150.

Dave

[lust4speed]

Definitely need pics of the fan.

[fiesta62]

ok 3 pics, fan is off a year 2000 model CL mercedes, fan size tip to tip is 18.5 inchs thats the actual fan not shroud its bigger of course....its got a big motor on it as u can see i figure merc do things right, overall looks similar to the m8 fan i guess, but its only 3.5 inch thick at the thickest point so should leave good clearance, will fit soon and will try to fit my stock shroud over the whole unit just to keep it looking stock, if possible

[67ramairowner]

Middle photo seems to show a "box" of some sort on what would be the radiator side of the shroud. What is that/

Agreed the Germans usually get it right when it comes to engineering. I suspect that the fan will get the job done pretty well.