Pelican Parts Forums - a/c vacuum pump recommendation

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a/c vacuum pump recommendation

I'm going to buy an a/c vacuum pump to use on my 930 as well as on my other personal vehicles. I was wondering what CFM rating is considered "good". I did a search but couldn't find anything . . .

Harbor Freight Vacuum

Ronnie,

COLB might chime in - he bought the Harbor Freight vacuum unit for the R134 conversion we did on his car recently.

http://forums.pelicanparts.com/porsche-911-technical-forum/755318-first-project-thread-88-cab-c-retrofit-cheap.html

The little pump seemed to do a sufficient job evac'ing the system. We ran it for about 15min initially to see if the system had any gross leaks, then a full hour for complete evac prior to charging with R134.

Considering the (hopefully) limited frequency that a non-pro would be using a vacuum, it's hard to beat the price.

Spec's may be on HF website.

Gordo

I have a small 1.5CFM pump. I believe it's this one:
https://www.ackits.com/pc/90060/Vacuumpump/90060+-+Mastercool+1.5+CFM+Dual+Stage+Vacuum+Pump

I've used it on probably 10 cars, it works OK, with time and repetition it will pull down about 21 inches of vacuum - no more. In hot weather (85+ degrees) I have to run a box fan or something on it while it is running or it will overheat after 5-10 minutes and shut down. In cooler weather (50-60 degrees) it does great. But who works on A/C when it's cool out?! :)

Anyway, good enough for occasional use and I believe it is higher quality/more effective than the air-compressor driven units. But not pro quality.

You don't need a vacuum pump. Just use two SPAL fans and trinary switch. Your AC will be fine.

BTW, the one I linked, I think you can find for about $100 now. I think I paid just a bit more than that a few years ago, not sure why the high price on ACKits.com.

Quote:

Originally Posted by SilberUrS6 (Post 7499257)

You don't need a vacuum pump. Just use two SPAL fans and trinary switch. Your AC will be fine.

Ha! Now it is time for YOU to get the ceeeegarrrrr!

Thanks for the suggestions.

Quote:

Originally Posted by Gordo2 (Post 7499227)

HF is currently handing out 25% discount coupons for use ONLY on the 4th.

http://www.harborfreight.com/25-cfm-vacuum-pump-98076.html

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=2&ved =0CDEQFjAB&url=http%3A%2F%2Fwww.harborfreight.com% 2Fmanuals%2F98000-98999%2F98076.pdf&ei=_um7Uf_MMcWtqwGHq4GADg&usg=AF QjCNH2MGr0IZh7ojTtsZVnqA8YQltdJg

You can buy a 2.5 cfm unit from Harbor freight Tools for a little over 100 bucks.

Quote:

Originally Posted by SilberUrS6 (Post 7499257)

You don't need a vacuum pump. Just use two SPAL fans and trinary switch. Your AC will be fine.

SmileWavy:D Now that is funny chit!

Your local FLAPS may let you use one for free. You put down a deposit, use it and then return it for a full refund.

I have the 6 cfm Robinaire pump, but you can get a smaller 4 cfm unit as well.

Be sure to change the pump oil each time (Grainger carries it). I would not buy HF on this item.

Quote:

Originally Posted by shadowjack1 (Post 7499843)

Your local FLAPS may let you use one for free. You put down a deposit, use it and then return it for a full refund.

+1 SmileWavy