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1987 911 air conditioner

I just spent a lot of money ($2100) having my AC worked on. New compressor, hoses, front condenser fan, conversion to R134A, etc. The results are disappointing. The air coming out of the outlets is only 10 degrees cooler that the outside temp. Is this all I can expect from the system? It is better than nothing but not by much.
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Old 08-28-2011, 11:53 AM
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You got off cheap.
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Old 08-28-2011, 12:55 PM
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Go over to the 911 technical section Lots of threads
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Old 08-28-2011, 02:36 PM
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The prob as I understand it is the surface area of the 1987 system is too small for today less efficient environmentally friendly refrigerants. FREON rocked and today's substitutes can't compete. I plan to add a new system such as Griifiths with condensors in ever possible location.
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Old 08-28-2011, 02:47 PM
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There is someone in the 911 forum making really nice new technology condensers that cover the entire grill area. A local guy here replaces the hose and fits a newer style condenser and the results are very impressive, not ice box but cold enough, it can be done.
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Old 08-28-2011, 03:38 PM
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Try searching for the Performance Aire under-belly unit. It's massive and apparently freezes the cabin really well
Old 08-28-2011, 04:08 PM
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Old 08-28-2011, 06:16 PM
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Bootleg freon sources still exist. You might pay through the nose for the "real stuff" and risk 5 years in prison for adding to the ozone hole, but in the long run it's a lot cheaper than upgrading. Unless of course you're environmentally conscious and want to save the planet, then do as I have done....jerk all that nonsense outa there!

We spoiled Americans seem to think that we cannot pilot an automobile without cool air wafting across our forheads, it's just unthinkable that we might get a bit of a "pit" driving home from work. Of course it gets kinda toasty in parts of Arizona but hey...it was 98 here today (dry, as usual) and it didn't stop me from doing what I enjoy. Took my Husquvarna desert bike cross-country in the heat of the day...you just gotta live for the moment.
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Old 08-28-2011, 06:35 PM
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Sounds like around 75% of that bill is labor and parts markup.
In my '87 I installed a Rennaire system with Sanden 507 compressor and aluminum adjustment bracket, pro cooler reciever dryer, desert duty serpentine front condensor, serpentine evaporator with R134 expansion valve, and barrier hoses that was about $1400 in parts.
I also put a 10" fan on the bottom of the origonal tube and fin tail condensor, and a Zims left rear fender well serpentine condensor kit with 10" fan.

Total parts cost was about $2100. I'm in hot and humid S. Florida and vent temps are around 50 degrees below outside ambient temps. I see and enjoy 35 degree left side vent temps on 85 degree days while driving and 45 degrees when it's around noon with full overhead sun heat load and it's 95 degrees in the shade outside. I havn't added any R134 in a little over a year now.

I have my own tools for evacuating and charging the R134 AC in my 2 cars.

If you don't have a 10" fan on the bottom of the rear condensor sucking air down through it that is wired to come on with the compressor then put one on. It takes about an hour or two to install one with the little push plastic fan mounts and good USA made 10" fans are around $70 and that will make more of a difference than anything else you can do to get colder vent temps.

It's too hot in florida during summer to go without AC unless you can't afford it. Then you just sweat alot, wear wet clothing while sticking to the seats, nearly pass out waiting at stop lights on sunny days while panhandlers pester you.. and deal with it.

Quote:
Originally Posted by remroc View Post
I just spent a lot of money ($2100) having my AC worked on. New compressor, hoses, front condenser fan, conversion to R134A, etc. The results are disappointing. The air coming out of the outlets is only 10 degrees cooler that the outside temp. Is this all I can expect from the system? It is better than nothing but not by much.
Old 08-29-2011, 07:18 AM
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+1 on the 10 inch fan. makes a world of diff
Old 08-29-2011, 05:47 PM
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Anyone have a suggestion a particular 10" fan that will fit ? And how to wire it?
Thanks
Old 08-30-2011, 08:41 AM
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Quote:
Originally Posted by 911TT33 View Post
Try searching for the Performance Aire under-belly unit. It's massive and apparently freezes the cabin really well
I think my 87 has one of those under it...about 4 foot square!!
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Old 08-30-2011, 09:28 AM
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Can someone post a picture of the AC compressor and how it is attached to the engine? I'd like to retrofit one.
Old 08-31-2011, 09:48 PM
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I remember some company has condenser relocation kit, puts a condenser infront of rear left tire. The type put condenser in the back of rear left won't work too much of engine exhaust heat.
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Old 08-31-2011, 10:11 PM
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Quote:
Originally Posted by CobraJet View Post
Can someone post a picture of the AC compressor and how it is attached to the engine? I'd like to retrofit one.

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Old 09-01-2011, 05:35 AM
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Thanks HH, I was wondering how this all fit in.

BTW, nice intercooler! How much boost you running?
Old 09-01-2011, 08:15 AM
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Thanks! Currently running 1bar...haven't dyno'd yet but seat of pants says close to 400hp.
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Old 09-01-2011, 08:41 AM
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Now THAT Is what I'm talking about!!!!

Engine size and mods?
Old 09-01-2011, 10:24 AM
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Next go around, I'll put pauter or other aftermarket rods, Increase compression to 8:1 to reduce low end lag, flame ring the heads/cylinders and pump more boost or do twin scroll twin turbos??? Its only money right!
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Old 09-01-2011, 11:07 AM
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