Cadillac SRX (Turbo) Radiator Fan

[KBScobravert]

I currently have a Mark VIII fan (18"), brush fan in 1990's technology. I know that CFM on high speed is around 4,800. The fan is a two speed fan and brand new old stock. So I should be able to see those CFM numbers.

With the new Holley Dominator EFI, I have the option to run a PWM fan. What are the thoughts on a Cadillac Turbo SRX Radiator Fan? They are 20" and brushless and I can package that to the radiator even if I just get a taller radiator.

I am having a hard time finding the CFM on full pulse for the Caddy fan but in watts (I think this is right) it is 850w whereas the Mark VIII is 350w on high.

The Caddy fan pulls 70amps on full tilt and that is not far from what the Mark VIII pulls on high speed 60-70amps start up but the Mark VIII only pulls 25amps in run on high (from what I am finding). Eitherway, I am running a 200amp alternator and free to wire it however I need to.

The car is the Cobra and cooling is very important to me so I can keep A/C on it and possibly a heat exchanger for the air/water water. I going to go back to 93oct and away from E85 so I am expecting higher coolant temps than I had before. That and once the temps got over 200* and I kept driving it would hit 215-220* from what I am sure was just pure heat soak in the engine bay.

Add for a regular CRX fan

http://www.ebay.com/itm/10-11-12-CADILLAC-SRX-ENGINE-COOLING-RADIATOR-FAN-20883034-OEM-/331099288162?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3ACadillac|Model%3ASRX&hash=item4d170e3262&vxp=mtr

Here are some pics of one I found on Lateral-G




Keeping the 17.5" tall radiator I have, I can use the fan's overhang to cover a heat exchanger like this.

[R3_82GT]

Wow - 850W = ~ 1.14 HP. It had better put out a lot of CFM.

[jw33]

All I know about PWM fans is that the "fan relay" on my sisters WJ went out about 4-5 times before we swapped it over to mechanical setup. The fan controllers are about $60 a pop. First thing I would do is ask Holley how much power the PWM circuit can handle. Then go out and find the fan setup that can fit your radiator.

You may have better results with heat shielding, coatings, and ducting hot air out of your engine bay using the hardware that you already have. I don't think just forcing more air is going to fix everything. Have you ever considered a pressurized cooling system?

[KBScobravert]

All I know about PWM fans is that the "fan relay" on my sisters WJ went out about 4-5 times before we swapped it over to mechanical setup. The fan controllers are about $60 a pop. First thing I would do is ask Holley how much power the PWM circuit can handle. Then go out and find the fan setup that can fit your radiator.

You may have better results with heat shielding, coatings, and ducting hot air out of your engine bay using the hardware that you already have. I don't think just forcing more air is going to fix everything. Have you ever considered a pressurized cooling system?

Bingo.. I just found that the ECU can not handle the 70amps. At most it will run 5amp on a PWM.

Painless does sell a solid state that will run them.

http://gopainlesswiring.com/f5-single-70-amp-fan-pwm-controller

The radiator I have, a Fluidyne is going to get modified to a dual pass to put the hose inlet/outlet on the driver's side.

Have not considered pressurized cooling system other than pressure created from heat with the cap letting off at 14lb (if I am remembering right).

I can keep the 18" Mark VIII put was just trying to squeeze out the most so I don't have to do this again after I get it running and find it not up to snuff.

[shumpertdavid]

Keith, the PWM portion of circuitry is controlled by a module (some manufactures refer to it as a relay. As best I can tell from the ebay ad, that fan connector is just a power and ground plug. The fan will run at full speed with the power and ground connected. PWM devices have at least 3 wires; power, ground, and the control wire from the PCM. So far, from the vehicles I've worked on, the fan controller is a separate component from the fan itself, it may be mounted into or onto the shroud but it's not made into the fan motor. The Crown Vics are attached to the fan shroud, older Dodge Caravans mounted on the bottom or the side of the drivers front frame rail. The PCM will never see or take any high amp loads, it will always be subbed out to a module\relay in my experience.