sTyleR

I've noticed a couple of odd little things with my car, during my ownership.

1. After stopping my car for a few minutes, and starting it back up, I can feel light heat coming out of the A/C vents into the cabin for about a minute after start up.

2. Whenever I drop it down from a higher gear (from 4th to 3rd, for example) and nail the throttle, an unusual smell (not bad, just unusual and noticeable) enters the cabin as a result. This is with the windows up, and no, it's not a gaseous odor.

Can someone offer me feedback on why these things may be happening?

dillon410021

you can turn the temp **** down to stop the warm air. If it is on hot, it will blow warm. It seems to blow air all the time.

J Berk

Never noticed any smells going from 4 to 3 or any other down-shift.....is your clutch slipping?

What's it smell like?

sTyleR

When this happens, the temperature **** is on maximum cool. The fan **** is on zero. And the A/C and heater are not on period. I feel as though it's engine heat, finding it's way into the cabin, through the vents upon these start ups.....

sTyleR

No, the clutch is not slipping. It doesn't smell like clutch either, I can't say that it smells like anything in particular. Mind you this happens with the windows up too. Maybe it's coming through my vents, such as I find that heat does in the first situation I mentioned. Hmmm....

joejoe

Heat will always come in due to control valve inside engine bay. It is default to open with no vacuum, so when car is off and vacuum bleeds off it opens. What you can do to alieviate this is zip tie it closed for summer.

My '84 also had a smell under acceleration. The fix for me was changing the rear hatch seal. If there is any loss of seal outside air will enter (and from rear it will be part exhaust) Hope this helps.

dillon410021

there is a plastic piece that breaks on 944's that will make your car blow hot air all the time.

check this
http://web.archive.org/web/200412140...x_v2&id=44&c=4

sTyleR

I understand what you're saying, but the smell I'm getting in my S2 isn't coming from the exhaust.

I do, however, get exhaust odor in my 924S. I am aware that that smell is due to separation of the rear hatch seal.

sTyleR

I'm not always getting heat through the vents, as the website describes. Mine simply releases a bit of heat after short moments in between shutting down and start up back up (a few minutes). I will however check to see if the heater clip is causing my problem.

PorscheDude1

Check the hatch seal above the lock, there is probably a 2" gap from shrinkage
allowing exhaust fumes into the cabin.

sTyleR

I appreciate the effort in posting, but you guys are killing me.

Clint's 944

Is the smell kind of sweet? Like coolant?

Are your fresh air vents open or closed?

sTyleR

The smell isn't sweet. Slightly bitter to the nose, if anything. My air vents are open. Most of the time I have the A/C blasting. Regardless of whether or not it's on however, the smell still persists. This happens when I quickly and smoothly drop it down a gear and step on it, going up to 5,500+ RPM.

Doug DeArmond

On the heat, there is a small vacuum tank by your battery. Make sure the small plastic hose and rubber elbow are connected well so no leaks. Follow the plastic tube to the engine and you will notice a small plastic check valve. It holds vacuum in the tank when the engine is shut off which holds the heater valve in the closed position. Make sure all the plastic tubing and rubber connectore are not leaking. By the way, full throttle reduces manifold vacuum to zero so if you have a leak and/or the check valve is not working what vacuum you have to control the position of the heat and AC controls will go away and the heater valve will start to open and the air damper flaps will move to their "normal" position so you will get different air that may smell different. Other smell causers when stomping the throttle are rear hatch seal leaks and the rubber shift boot seal (under the leather one) missing or incorrectly installed. So you stomp the throttle, loose vacuum to the HVAC controls, outside air dampers move to recirc (close) cabin pressure goes more negative without cowel air pressure and you smell exhaust from the hatch seal leak and a bit of heat applied to the heater core makes it smell from years of corruption collecting on it....... orn something like that. BTW, check all those little plastic tubes and rubber connectors and engine hoses for vacuum leaks. Good Luck!

sTyleR

That makes sense. I'll check for vacuum leaks and hopefully have that sorted out. Thanks!