Electric Fan, Aux For Condenser

no bull · April 24, 2008

Has anybody managed to squeeze in an aux electric fan for the A/C condenser, WHILE retaining the OEM fan?

I have to wait until my truck is fully warmed up, thus causing the fan to spin, before I can get any good A/C. Also a problem sitting in traffic, at speed on highway, no Problem.

Thanks

PS The truck is a Yukon XL 2500, 8.1L with all the additional cooler stuff on it (PS, Trans)

Killerbee · April 24, 2008

Don't you have the Thermoviscous fan? If so, it is always pulling.

hubbycap · April 24, 2008

Don't you have the Thermoviscous fan? If so, it is always pulling.

Yes, I believe it spins at 500 RPM when off-demand.

Why not consider removing the OEM and going with electric fans all the way?

no bull · April 24, 2008

Don't you have the Thermoviscous fan? If so, it is always pulling.

Yes I do have it but it just does not cut it in the above conditions. A condenser needs lots of air running thru it.

no bull · April 24, 2008

Yes, I believe it spins at 500 RPM when off-demand.

Why not consider removing the OEM and going with electric fans all the way?

If that was always running at 500 rpm you would hear it roar

as for fans only, I would concider it if someone would make a fan for this application...I have looked into it somewhat already.

Killerbee · April 25, 2008

Electric fan replacements only reduce the vehicle work load capacity.

If you are not getting what you need for cooling, I suggest having it looked at. I live in 115 degrees, and get very good cooling at idle. I think my fan is the same one, a 20" TV.

One thing you can do that will really help. Seal the condenser to the radiator with strips of foam. That will make a big difference. You can also blow the fins out from the other side.

500 rpm is not unrealistic, with a fan drive ratio of 1.4, a 900 rpm hookup would be 1300 rpm fan speed. 500 rpm in freewheel sounds about right.

Did it get warm in Queens?

hubbycap · April 25, 2008

Yes, I believe it spins at 500 RPM when off-demand.

Why not consider removing the OEM and going with electric fans all the way?

If that was always running at 500 rpm you would hear it roar

as for fans only, I would concider it if someone would make a fan for this application...I have looked into it somewhat already.

You are correct. Let me clarify. Hayden thermal clutch specifications are for 20%-30% of shaft speed when disengaged, and depending on duty cycle of particular clutch, 60%-90% of shaft speed when engaged.

Approximate idle disengaged speed: 100-200 RPM; Highway disengaged speed: 400-600 RPM

no bull · April 26, 2008

Electric fan replacements only reduce the vehicle work load capacity.

If you are not getting what you need for cooling, I suggest having it looked at. I live in 115 degrees, and get very good cooling at idle. I think my fan is the same one, a 20" TV.

One thing you can do that will really help. Seal the condenser to the radiator with strips of foam. That will make a big difference. You can also blow the fins out from the other side.

500 rpm is not unrealistic, with a fan drive ratio of 1.4, a 900 rpm hookup would be 1300 rpm fan speed. 500 rpm in freewheel sounds about right.

Did it get warm in Queens?

I found a 2500 cfm fan that I can use as an aux, will fit between Rad and fan.

Try this for me if you can, after your truck has been sitting all night and part of a warm morning (where-as the interior is warm) start her up and immediately turn the A/C on high, if it is like mine, it will blow cold for a few sec's and then warm until the truck gets hot enough to turn on the thermal clutch in the fan, then it will again blow cool.

Thanks

Ps yes it got warm enough to turn on the A/C in Queens already

4ws f 7 · April 27, 2008

I have the same issue. I have thought about this a lot and think you could program PCM to use pin 33 as trigger with A/C pressures. It appears you will need a tuner

that uses EFI live. I would call Justin at EFI live to see what he thinks. Good luck.