<VV> Cooling Question

[Mikeamauro at aol.com]

" ...I've noticed in some photos of Corvairs with A/C, that the  owners 
installed a couple of auxillary fans in front of the 1966-67 style  
condenser....Anyone have experience with this? ... Thanks!...Bill Hershkowitz 69  Monza 
Coupe 110 PG A/C..."
 
Bill... I have said electric puller fans on my 67 factory air coupe.  When 
I converted the system to 134a, keeping the stock condenser, the fans  
became a necessity (although, properly controlled, they would certainly  also 
help an R-12 system). With 134a, you either need more condenser, or more  air 
flow. The fans are relayed-controlled and wired in series to run 1/2  speed 
whenever the compressor clutch is energized. Then, as head pressure rises,  a 
head pressure switch activates another relay which changes the  wiring to 
parallel, allowing the fans to ramp up to full speed. As long as  the AC 
clutch is energized, the fans will switch back-n-forth between high  and low 
speed based upon the change in head pressure. This system has been  in 
operation for about 5-years. Works extremely well, and I live in hot  Florida.  See 
some pictures here: _http://rides.webshots.com/album/58895182BNCYAp_ 
(http://rides.webshots.com/album/58895182BNCYAp)   .
 
Can't speak directly to the improvement in engine temps...didn't test  
before and after...but probably helps.



Mike Mauro
1967, PG, 3:27, 110, with Factory AC (modified to  134a)