Dash Vent Question

VaSteve · 07-06-2004, 05:57 AM

Ok I took the car out yesterday for a fun 4 hour trip in 90 degree 90% humidity weather. Had to stop and put the roof on an use the a/c. When the a/c started lugging the motor at stop lights, I turned it off an started (continued!) to sweat. Then it started to rain so I figured I could survive on just the fresh air blower with the windows up. Well, not really...

My question is, is fresh air supposed to come out of the dash vents? I can only get it to come out by the winshield, which is pretty useless on a hot day. I thought that fresh air comes in through the hood vents and into the car, what's wrong??

Oh, and the fan decided to squeal in the middle of all that, which scared the hell out of me since I for a second thought the fan belt broke!!

Yes, is was a rare day for me and the Targa. I'm sticking to driving on the nice days..

Paulporsche · 07-06-2004, 06:51 AM

Only conditioned air is supposed to come out of the center dash vents.

Since I have removed my air I am going to try to connect the center vents to my fresh air hose. Makaio did this a couple of years ago and says it can be done easily with hardware store parts.

Paul

david914 · 07-06-2004, 06:52 AM

Yeah, what you have is normal. The fresh air will only come out of the defroster vents at the windshield and the footwell vents. The side vents are only for heat and A/C. The center dash vent is A/C only. Replace your York A/C compressor with a Sanden and your engine "lugging" at idle will disappear. As a matter of fact, I can't tell at all when the thing kicks in on my SC. Much better!

VaSteve · 07-06-2004, 07:05 AM

Quote:

Originally posted by david914
Replace your York A/C compressor with a Sanden and your engine "lugging" at idle will disappear. As a matter of fact, I can't tell at all when the thing kicks in on my SC. Much better!

David,
I didn't fully describe it, but when I would push in the clutch pedal, revs would drop to ~250 and the alt light would blink. I experienced a similar phenomenon when the mix was too rich. I turned off tha a/c and suffered the whole way home, but the didn't experience the same problem. Is this lugging what you experienced as well before your switch? I'm not entirely convinced my mix is correct either though...

Steve

Paulporsche · 07-06-2004, 07:22 AM

I have found in the past, when I had my AC, that a too rich mixture would present even more mixture related problems when the barometer is down, such as when it is raining or muggy.

Revs would drop @ idle and w/ the AC on it would come close to stalling.

Leaning the mixture slightly cured the symptoms.

If you drive a lot in these conditions, you can also try turning up your idle speed slightly.

Paul

VaSteve · 07-06-2004, 07:47 AM

Quote:

Originally posted by Paulporsche
I have found in the past, when I had my AC, that a too rich mixture would present even more mixture related problems when the barometer is down, such as when it is raining or muggy.

Revs would drop @ idle and w/ the AC on it would come close to stalling.

Leaning the mixture slightly cured the symptoms.

If you drive a lot in these conditions, you can also try turning up your idle speed slightly.

Paul

Muggy? In a mid-Atlantic July? never!!!

Ha ha. I have only had the car 7 months and these were the most adverse (to the the driver) conditions I have experienced.

Trust me, I won't be driving a lot in these conditions.

It was either turn on the a/c at that point or turn around.
Thanks!

david914 · 07-06-2004, 08:18 AM

Yeah, the York compressor draws much more horsepower than the later Nippondenso units or a Sanden, Seiko, etc. If your system is operating OK otherwise, increase your idle speed adjustment to compensate for the extra drag on the engine while the A/C is on.

Paulporsche · 07-06-2004, 07:50 PM

I used to set my idle speed just over 1000 so that when the lights, fan, AC , stereo, and turn signals were all on the damn thing would still idle!

Paul