Engine cooling questions.

[ozconnection]

Speaking of fans, some years back I noticed that some cars got 7 blade fans and some got 8 blade fans. Probably the 74-78 factory AC cars got the 8 blade ones. Don't know how much difference it makes but, since then, I've always used the 8 blade fan.

I don't mind you using my photo for this topic, just say who ya got it from. Cheers:paranoid:

[sblake01]

Sorry Mark. Not wanting to pull the fan off of one my cars to show the difference, it was the only one I could find. Got that a while back so I didn't recall where it came from when I posted it. I marked it in case I ever need to use it again.

[d240zx2]

What BeanDip said, yes, ditto.

My original, but re-seamed and rodded radiator with a 180 thermostat serves quite well. I have never seen the temp above 200, even on a 95 degree day with air running and in slow, stop'n go traffic. Track temps never exceed 190 and I am really hammering it then. The key, I think, is total system health.

Regards,

Frank

[AggieZ]

If your fan clutch is going out, you might want to consider replacing the fan clutch with an electric fan. Particularly if you spend a lot of time in stop/go traffic with an air conditioner running. If you do this mod, you will also need to upgrade your alternator to at least a 60 amp... which is still pretty whimpy.

[m4xwellmurd3r]

If your fan clutch is going out, you might want to consider replacing the fan clutch with an electric fan. Particularly if you spend a lot of time in stop/go traffic with an air conditioner running. If you do this mod, you will also need to upgrade your alternator to at least a 60 amp... which is still pretty whimpy.

it's really easy to rebuild those clutches as long as the rubber seal isn't bad. Took me maybe 30 minutes to pull the fan, take it apart, clean it, fill it back up with oil, and re-install it. locks up like it should now. maybe even a little too well, but it's better than it not working at all. All it takes is a bottle of that stop leak additive that's as thick as honey.

[sblake01]

I've rebuilt them too but I wouldn't use that stuff. That's why it locks up "maybe even a little too well" as you say. You should use silicone oil, like what was in it in the first place. I forget the weight because it's been a while since I did one and I'd have to find my notes. It's available through Toyota but you can also buy silicone oil at places that sell RC car supplies for a little less money.