Hello, I am about replace my radiator for my 2004 Chevy blazer because im pretty sure that is why my AC is not working properly. It comes with two pretty big electric fans and I was wondering what all I need to do to swap from the clutch fan to the electric fans. Has anyone here been able to do that? I know nothing about electrical systems but I can do it if I know what it is that I need to do. Also should I go ahead and replace all my hoses and condenser while im at it?

 

You'll need some kind of a fan controller. I think your PCM can be programmed to control the fans, but it's not something you can do yourself. Probably better to use a standalone controller. The best I've found is made by Delta Current Controls. I have the 2sp2 and it's been 100% reliable. I would replace the hoses if they're more than a few years old, but the condenser is probably fine. It's not that expensive, though, so you might want to anyway. If you're going to open up the A/C system, it would be smart to replace the accumulator and the orifice tube, too.

 

Have the HVAC system properly evacuated (depending on the state you are in it may be an offense to vent the refrigerant).

Saying that you change the radiator you mean the engine coolant radiator. As TomA said it will need a controller which switches at least 1 fan ON when using the HVAC and depending on the setup and fans (single speed or dual speed) they should be switching according to the cooling needs.

The radiator of the HVAC is usually to be found "in front" of the radiator (engine coolant) and is not associated with it. The HVAC has it's own lines, evaporator, dryer cartridge, and radiator.

 

I can say with absolute confidence that your radiator is not the reason your ac isn't working. Your either low on 134 or of of the parts is not working. Check to see if your compressor clutch is even kicking on first, then check if you have sufficient pressure. Then pressurize with nitrogen and check for leaks around the system to narrow it down. I'd place a met that it's your suction service port.

 

In what way is your AC not working properly? Why do you think that your radiator is the cause?


George

 

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I'd agree with some of the others above, that you need to diagnose your A/C issue separately from the swap from mechanical cooling fan to electric fans. Fix that problem before you add more variables because simply swapping the fan is not going to make the A/C suddenly start working.

Once you have the A/C fixed, then in my opinion switching to an e-fan setup is well worth the effort.

Switching to an electric fan is relatively straightforward if you are comfortable with electrical systems (testing, measuring, soldering, etc) and some fabrication. I swapped in a two speed dual fan setup from a Dodge Intrepid into my Sonoma, and it cools the truck significantly better than the mechanical fan. With the mechanical fan when sitting in stopped traffic on a hot day (+30*C), the engine temperature would creep up to 110*C (normally runs at 95*C), the mechanical fan roars like a jet engine, and the A/C would blow warm until I was able to start driving again. Now with the e-fans I got caught in stopped traffic a couple weeks ago during the insane heat wave where the ambient temperature was 38*C. My engine temperatures never broke 100*C, and the A/C was ice cold the whole time with 4 people in the truck.