Manual and Electric fan combo
 

I searched to see if anyone has done this but came up short.

I want to get the AC in my truck working(under dash) but I don't want to mess with R12 anymore. Would a combination Electric fan and manual fan work? The manual fan for cooling the engine and the electric fan for air flow at idle for the AC.

There are pictures in this thread that gave me the idea. The fan is $50 or so on rockauto.
http://67-72chevytrucks.com/vboard/s...d.php?t=254617

Would this make the R134a cool as well as the R12???

Re: Manual and Electric fan combo
 

I asked this question to a guy at Summit and he recommended not to do it. Something about air turbulence. So since I have to make my own A/C fluid lines I am thinking of moving my condenser in some way to gain the use of the electric fan and utilizing the mechanical fan for the engine. Right now I have dual electric fans for the engine. I may try them for the A/C As well as I will have a Sanden hooked up to cycle on and off. I just think it's funny that my engine cooling will be affected by my A/C cycling on and off. But I guess that is how new cars work anyway.

Re: Manual and Electric fan combo
 

The turbulence issue makes sense.

If I get around to doing this, I'll try it both ways. With mechanical fan, then without. Just to see if it makes much of a difference in cooling.

thanks for your reply

Re: Manual and Electric fan combo
 

I had a Nissan pickup that ran on the hot side with the AC on and sitting in traffic. Everything was good on the cooling system only possibility left was fan clutch. An electric fan was cheaper so I went that route. I saw no adverse effects from adding the electric fan in front to augment the mechanical fan. Truck didn't get hotter quicker or need the electric fan more often than before so I just switched it on manually when needed sitting in traffic with AC on. As a bonus the AC blew colder due to the increased airflow through the condenser.

Re: Manual and Electric fan combo
 

I have both on my 72 with Vintage Air ,the truck kept wanting to run hot at idle at red lights with the air on so we added a duel electric fan in front of the radiator .No problems since ,when the gauge starts rising I turn the fan on .

Re: Manual and Electric fan combo
 

The guy at Summit just doesn't want to seel you something that might not work as planned. Lots of newer vehicles have a mechanical thermal clutch fan for cooling the radiator and a smaller electric fan on the condensor.

Re: Manual and Electric fan combo
 

My plan is to put both of them behind the radiator.

If the electric fan is in front of the radiator, would the condenser and radiator smooth out the turbulence?

Where if they were both behind the radiator, one would cause turbulence for the other?

I'm guessing here.

Re: Manual and Electric fan combo
 

I run electric only on mine. Two pusher fans in front of the radiator.... It's never seen 200 degrees

Re: Manual and Electric fan combo
 

Interesting! I'm getting ready to install Vintage air, front and rear, in my 69' Suburban. I'm now thinking of putting an electric pusher fan in front of the condenser and setting it to come on automatically at 195* and have an inline switch to turn it on manually. Does this sound reasonable?

Re: Manual and Electric fan combo
 

Same here. I have the standard factory fan and then an electric fan on my condenser. My electric fan is ran by an add on thermostat and comes on automatically when the temp reaches the set temperature.