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will extra fan help R134a?

pippo on Thu February 12, 2009 8:16 PM User is offline

Hi guys,

Advice please, on this; Have 87 sunbird, aftermarket ac done in 88 (R12), changed to r134a 2 yrs ago. Lousy. The radiator fan from factory has NO shroud, and condenser has only one fan, which was adequate with r12.

Should/could I add a fan WITH a shroud on the radiator to help/and also add a fan adjacent to condenser too? Would this help ac to generate cooler air say, 4-5 deg f cooler?

Thanks!!
Joe

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Dougflas on Thu February 12, 2009 9:10 PM User is offline

when you went from R12 to R134a, did you change the TXV to a R134a type?

pippo on Sat February 14, 2009 4:42 PM User is offline

Quote
Originally posted by: Dougflas
when you went from R12 to R134a, did you change the TXV to a R134a type?

Thanks Doug, for helping. Dont know what a TXC is. I did quite of work to the system, but it mainly is of course, an R12 system, with R143a in it. So what is the TXC?

Thanks!

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Dougflas on Sun February 15, 2009 6:45 AM User is offline

TVX is the expansion valve. For optimal performance, you should change the TXV to a r134 type. You want to keep the refrigerant and the TXV matched. You're looking for 4 to 5° so every little bit of matching will help.

pippo on Mon February 16, 2009 7:56 PM User is offline

Quote
Originally posted by: Dougflas
TVX is the expansion valve. For optimal performance, you should change the TXV to a r134 type. You want to keep the refrigerant and the TXV matched. You're looking for 4 to 5° so every little bit of matching will help.

Thanks again, Doug. Man, I was not aware of this, but, I did put in a NEW expansion valve (never heard of it called a TVX, though). Either way, wouldnt my original evaporator accomodate only one kind of valve, or would I have had a choice for this "R134a" type?

Just the same, now, that the damage is done, back to the fans. What do you think? I mean, that is a simple fix, and if it SHOULD improve temp, its worth it

Please advise.

Thanks
Joe

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TRB on Mon February 16, 2009 7:59 PM User is offlineView users profile

All depends on what your high side pressure and condenser temp readings are!

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pippo on Thu February 19, 2009 7:54 PM User is offline

Quote
Originally posted by: TRB
All depends on what your high side pressure and condenser temp readings are!

Thanks, TRB. Sounds more complicated than I thought. Hmm, maybe if I propose it this way: all else being equal, will an extra fan in front of condensor (adjacent to other one) help in cooling?

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mk378 on Thu February 19, 2009 9:03 PM User is offline

If you have the typical tube and fin condenser of that era, replacing it with the largest parallel flow that will fit in the space should help a lot more than fans would.

Fans only count when the car is sitting still or moving slowly. At highway speed, the blast of air from the motion of the car is stronger than any fan action. So if it doesn't get real cold on the highway either, the problem is more than just fans.

pippo on Fri February 20, 2009 6:08 PM User is offline

Quote
Originally posted by: mk378
If you have the typical tube and fin condenser of that era, replacing it with the largest parallel flow that will fit in the space should help a lot more than fans would.



Fans only count when the car is sitting still or moving slowly. At highway speed, the blast of air from the motion of the car is stronger than any fan action. So if it doesn't get real cold on the highway either, the problem is more than just fans.

Wow, never looked at it that way. Thanks, MK!! I understand about higher quality/newer design of condensers. Guess I was trying to avoid yanking out the whole thing, including evacuating freon. Now I will rethink the whole thing.

Tanks!

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