outside air gets inside the 3.2 carrera
#1
outside air gets inside the 3.2 carrera
Hi,
May I know if the 1987 3.2 carrera has fresh air going inside the cabin all the time through the front vents? I am comparing it to cars with a switch that can control the recirculation of air in the cabin. The fumes in front of me always goes inside the car.
Thanks
May I know if the 1987 3.2 carrera has fresh air going inside the cabin all the time through the front vents? I am comparing it to cars with a switch that can control the recirculation of air in the cabin. The fumes in front of me always goes inside the car.
Thanks
#2
Team Owner
I have a 78 SC ( no AC ) and the front dash vents are fresh air only. Ian has a great pictorial for this on the Carrera.
I hope Ian doesn't mind .. here is the link to his site , your answer is in there .. it is a really good site.
http://members.rennlist.com/imcarthur/
I hope Ian doesn't mind .. here is the link to his site , your answer is in there .. it is a really good site.
http://members.rennlist.com/imcarthur/
#3
Rennlist Member
The top two levers on the dash control the fresh air amount (left lever) and fan speed (right lever). With both of these levers pushed to the left, the fresh air is as "off" as it can be. In reality it is not an "air-tight" seal and the forward motion of the car will force some air (and fumes) into the car. Also, there is no activated charcoal filter like in some newer cars. So, stopping the fume odor entirely is probably not possible.
#4
air really only blows into my 86 front vents when I have the ac or heat on. Not much fresh air flow otherwise, except to windshield and floor only, just a trickle out the others.
#5
Rennlist Member
If the front air box assembly (plenum) in the trunk doesn't have the cables adjusted properly, you will get ambient air in the car, regardless of the lever position. You need to push the levers to the far left and check to make sure the flapper valves in the front air box are closing all the way. Until they do, you will get ambient air in the cabin. You'll have to remove the cover and hoses to expose the flappers.
#6
I haddah Google dat
Rennlist Member
Rennlist Member
I'm pretty sure there is a some passive air circulation. No, not enough to blow in your face, but there is some circulation due to air pressure generated by the scoop facing forward and the extraction vents facing backward at the top of the rear window.
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#8
Addict
Rennlist Member
Rennlist Member
Blue is Fresh Air
Red is Heated Air
AC not shown for simplicity.
The heated air system is drawn from the rear.
The fresh air ventilation system is drawn from the hood grill.
Ian
#9
I haddah Google dat
Rennlist Member
Rennlist Member
Wow!! I have to "right click, save as" again. Two of my computers are on the fritz, dangit.
The owner's manual calls it a "flow through" fresh air system that does not produce a draft.
The owner's manual calls it a "flow through" fresh air system that does not produce a draft.
#12
Addict
Rennlist Member
Rennlist Member
No. There are 3 separate systems in the 911.
Hot air from heat exchangers in the rear.
Fresh air via front vents.
AC from the front (with the cooling system sprinkled front & rear)
The only time they intersect is in the ducting in the dash.
Ian
Hot air from heat exchangers in the rear.
Fresh air via front vents.
AC from the front (with the cooling system sprinkled front & rear)
The only time they intersect is in the ducting in the dash.
Ian
#13
Yep, that's how mine works...no fresh air from the vents along the middle of the dash, only from windshield and floor vents, heat and ac air flow as noted in pic...whew, I'm not crazy and my hvac controls work fine.