AC upgrade - Rennlist - Porsche Discussion Forums

Notices
911 Forum
Sponsored by:

AC upgrade

Reply

Old 09-12-2018, 04:15 PM
  #1  
Krumville
New User
Thread Starter
 
Join Date: Sep 2018
Location: Catskills, NY
Posts: 3
Default AC upgrade

Hello all, Im New here with an '87 911 targa. I recently bought the car and had the AC recharged(with 134a) and vac tested. It blew cold for a a about 6 non-consecutive hours then stopped. I could never get cooled air out of the side vents at all. Now I get nothing at all from the AC control. The Heater still works well as expected.
Will an OEM ac work with R134A? If not what would one expect to pay for upgrading the whole system? Thanks in advance for any advice
Ken
Krumville is offline  
Reply With Quote
Old 09-12-2018, 04:52 PM
  #2  
griffiths
Addict
Rennlist Member
 
griffiths's Avatar
 
Join Date: Jun 2004
Posts: 894
Default

First, you want to think about integrity, meaning no leaks, controls and motors work, compressor is in decent shape.
a) Stock factory hoses and o-rings leak, replace them.
b) The 86-89 factory evaporators will all leak in time due their construction, consider replacing with an upgrade.
c) Drier, you will want a new one.
d) Compressor on 84-89, typically can get 100k miles, but not all the time. So you disassemble, inspect bores, pistons, wobble plate and reed valves.
If its clean inside with no wear, under 100k, consider just a seal kit, otherwise a new Denso compressor
f) Check you evaporator blower motor, does it squeal, if so replace it.
g) Check your front condenser blower motor,does is squeal, if so replace it.
Check to see if there is an inline 7.5 to 10 amp fuse assembly connected in its wires harness, if not put one in.
h) See if you have all 3 fans speeds for the evap blower motor; RH **** in the center console.
i) Test the thermostat,LH **** in console, when the ign key is on accessory position, the evap motor turned on,
turning the thermostat to max cold (fully clockwise) you should hear the front condenser blower motor turn on,
turn the **** to warm/off (fully counter clockwise) front condenser blower motor turns off.
j) Do a visual inspection of the engine deck lid condenser and the front condenser, any signs of refrigerant oil
on the bends in the tubing or anywhere else?

Second, you think about upgrades. Most 911's do not produce cool enough vent temps whenever you start
getting above 80F outside air temps. The car needs more condenser area, and additional vents.

griffiths is offline  
Reply With Quote
Old 09-12-2018, 07:34 PM
  #3  
mike5876
Addict
Rennlist Member
 
Join Date: Aug 2009
Location: Albuquerque, New Mexico
Posts: 145
Default ac

Originally Posted by griffiths View Post
First, you want to think about integrity, meaning no leaks, controls and motors work, compressor is in decent shape.
a) Stock factory hoses and o-rings leak, replace them.
b) The 86-89 factory evaporators will all leak in time due their construction, consider replacing with an upgrade.
c) Drier, you will want a new one.
d) Compressor on 84-89, typically can get 100k miles, but not all the time. So you disassemble, inspect bores, pistons, wobble plate and reed valves.
If its clean inside with no wear, under 100k, consider just a seal kit, otherwise a new Denso compressor
f) Check you evaporator blower motor, does it squeal, if so replace it.
g) Check your front condenser blower motor,does is squeal, if so replace it.
Check to see if there is an inline 7.5 to 10 amp fuse assembly connected in its wires harness, if not put one in.
h) See if you have all 3 fans speeds for the evap blower motor; RH **** in the center console.
i) Test the thermostat,LH **** in console, when the ign key is on accessory position, the evap motor turned on,
turning the thermostat to max cold (fully clockwise) you should hear the front condenser blower motor turn on,
turn the **** to warm/off (fully counter clockwise) front condenser blower motor turns off.
j) Do a visual inspection of the engine deck lid condenser and the front condenser, any signs of refrigerant oil
on the bends in the tubing or anywhere else?

Second, you think about upgrades. Most 911's do not produce cool enough vent temps whenever you start
getting above 80F outside air temps. The car needs more condenser area, and additional vents.

Listen to this guy i have used his advice and products in several 911s and no one knows how to make an old 911 ac blow cold like he can!!
mike5876 is offline  
Reply With Quote
Old 09-12-2018, 08:16 PM
  #4  
Pavegeno928
Addict
Rennlist Member
 
Pavegeno928's Avatar
 
Join Date: Sep 2006
Location: Alabama
Posts: 1,032
Default

Originally Posted by mike5876 View Post
Listen to this guy i have used his advice and products in several 911s and no one knows how to make an old 911 ac blow cold like he can!!
My 88 Cab blows ice cold in southern Alabama stop and go traffic. Griff will take care of you. Do it right and do it once, don't piecemeal it.
Pavegeno928 is offline  
Reply With Quote
Old 09-12-2018, 10:31 PM
  #5  
Krumville
New User
Thread Starter
 
Join Date: Sep 2018
Location: Catskills, NY
Posts: 3
Default

Thanks for the replies and detailed breakdown, looks like I have a bit of work to do.. fortunately the weather is cooling off up here. 👍
Krumville is offline  
Reply With Quote
Old 09-13-2018, 08:26 AM
  #6  
Krumville
New User
Thread Starter
 
Join Date: Sep 2018
Location: Catskills, NY
Posts: 3
Default

Would anyone have a ballpark idea what I should expect to pay for a comprehensive overhaul as Griff describes? Or even recommend a particular shop in the NY area?
Krumville is offline  
Reply With Quote
Old 09-13-2018, 03:56 PM
  #7  
Pavegeno928
Addict
Rennlist Member
 
Pavegeno928's Avatar
 
Join Date: Sep 2006
Location: Alabama
Posts: 1,032
Default

Originally Posted by Krumville View Post
Would anyone have a ballpark idea what I should expect to pay for a comprehensive overhaul as Griff describes? Or even recommend a particular shop in the NY area?
I replaced everything and had a Florida Porsche dealer do the install who had done a few before. Mid $4s parts and labor. Did a 4 condenser system including two wheel wells replacing both front and rear stock condenser. New hurricane blower, barrier hoses, center vent, variable fan controller, new expansion valve, evaporator, rcvr/dryer, and compressor. Installed in late 2008. Have had to add freon once to tweak in the last 10 years. I don't think I kept a single original part except for the ducting.
Pavegeno928 is offline  
Reply With Quote
Old 09-14-2018, 01:37 PM
  #8  
theiceman
Super User
 
theiceman's Avatar
 
Join Date: Aug 2005
Location: Cambridge Ontario Canada
Posts: 22,386
Default

Get Griff to give you a quote
theiceman is offline  
Reply With Quote
Old Yesterday, 05:49 PM
  #9  
mstier
User
 
Join Date: Nov 2001
Location: Paramus, NJ
Posts: 47
Default

Another idea is just not to use the AC. The guys you've been talking with in this thread are in Albuquerque and Alabama--their choice is to have functioning AC or not to drive the car. You're in the Catskills and have a Targa. Take that top off and drive! If it's raining, leave the car in the garage and drive something else.

I've had my car, an '88 coupe, for 18 years in north Jersey, and the AC only worked for the first year. I think I used it twice. Haven't turned it on since. You can't hear the engine or the exhaust with the car closed up. Even during a miserable summer like the one we just had, it's not so hot that an open car like the ones we have isn't plenty tolerable.
mstier is offline  
Reply With Quote
Old Yesterday, 06:38 PM
  #10  
dinnyin
Addict
Rennlist Member
 
Join Date: Dec 2016
Location: SoCal
Posts: 30
Default

Originally Posted by mstier View Post
Another idea is just not to use the AC. The guys you've been talking with in this thread are in Albuquerque and Alabama--their choice is to have functioning AC or not to drive the car. You're in the Catskills and have a Targa. Take that top off and drive! If it's raining, leave the car in the garage and drive something else.

I've had my car, an '88 coupe, for 18 years in north Jersey, and the AC only worked for the first year. I think I used it twice. Haven't turned it on since. You can't hear the engine or the exhaust with the car closed up. Even during a miserable summer like the one we just had, it's not so hot that an open car like the ones we have isn't plenty tolerable.
This guy Targas
dinnyin is offline  
Reply With Quote
Old Today, 05:21 PM
  #11  
mstier
User
 
Join Date: Nov 2001
Location: Paramus, NJ
Posts: 47
Default

Exactly, which is why I wrote "Take that top off and drive! If it's raining, leave the car in the garage and drive something else." My understanding is that most all Targa tops leak anyway, so if it's raining you don't want to be out. And when I referred to an "open car," which I can see might have been confusing, I meant as open as it can be, like a coupe with windows open, and sunroof if you have it.
mstier is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: