CuttyShark

'89 S4, 18k miles
R134

Searched but couldn't find anything on this..

What should the difference be with between outside/inside temps. or what have you experienced.
Max cold
70 Mph. @ 100 degrees
Center vent temp

Mine is about 38-40 degrees.
I recently had freon level checked by gauges- said that they were OK.

Doesn't seem cool enough , any suggestions?

Thanks

AO

Sounds pretty damn good to me.

Suggestion: Drive on a cooler day.

Herman K

I checked mine with 100F outside coming back from OCIC I got 2-4C with the probe against the inside evaporator core and with the probe stuck in the door vent it measured 40F probe laying in the car between the 2 front seats 80F

I believe I'm getting max cool out of the evaporator but perhaps with an upgraded blower (higher CFM) I can deliver more cold air faster in to the cab.

H

CuttyShark

That is a cooler day in Texas - Hah!

dprantl

38 deg F air out of the vents doesn't seem cold enough for you when outside it is 100 deg F ambient?

Dan
'91 928GT S/C 475hp/460lb.ft

Randy V

That sounds about right.

CuttyShark

NO,NO --38Degrees difference.. so about 62

fraggle

ahhh does sound a bit weak. has the condensor been cleaned? recirc flap working correctly??

CuttyShark

no, will check - thanks

dr bob

With slider on Max cold, vent temp should be about 35 degrees colder than floor temp, with lowest possible about 38-42 lowest possible with freeze switch working correctly. Fan on second speed, car not heat soaked in the dash area. Evaporators often need to be cleaned, which helps both heat transfer and airflow. The hvac vacuum system needs to be leak-free, heater valve must seal closed, and the blend door needs to seal out outside air if you expect Max cooling capacity. Lots of little things combine to hurt system performance.

Bill Ball

OK, that's inadequate. My temperature drop is about 60F.

fraggle

after 8 years on rennlist I think this summer has the highest number of "MY AC IS BUGGERED" threads than any previous year.

Good luck troublshooting!

MBMB

When I drive around with my AC cranked up and windows open in the Houston humidity, clouds blow out of my center vent.

CuttyShark

Wow, in hearing how cool some of your cars are,... I thought there was something wrong...
I have checked the coil in front by the dryer, it is clean..haven't checked the one next to the fan .
I have had my heater valve tied off.
Thanks

Dictys

I get 38 f from center vent with outside temp at 115 f, my heater core is bypassed and my AC system has just been refreshed and runs 134a. This is at idle.

So a 77 f difference.

This is good enough to keep me cool despite having no rear AC in my car.