Jon93

I've recently taken ownership of a C4S.

It seems that if I drive the car, then get out for a short while, then go for another drive, the drivers seat belt is heated up. Presumably the area where the belt stores gets hot during engine running?

Is this normal? Since I live in sunny Adelaide, I don't really require this luxurious function on my 993.

geolab

Thats a $4557 option, code 01L Res. and you want it removed ?

ToreB

Part of the Standard Delivery in a 911.
Heated air from the engine is routed through both door sills.
Cheers,
Tore

cabrio993

Geo, I believe that the $4557 option, code 01L Res. that you are referring to, is the Seat Belt cooling kit. It includes front installed radiator and water cooling.

Avenger6

Weird..... on MY car, it is the passenger's seatbelt that get's heated up/gently warmed.....

Must be a different option code?

Avenger6

(In case you don't get the clever humor going on here....)

The oil tank is forward of the (edit for clarity) REAR wheel well on the right side of the car, right where the seatbelt reel and belt "storage area" is, so yes, engine heat from the oil tank warms up the seatbelt there.... your "driver's side" is just on the "wrong side...."

ilko

This shouldn't happen. There are flaps for the heating system right under the seat belt reels. Your flap must be malfunctioning and releasing the hot air in the chamber where the reel is located.

I suppose it's not fatal, but it continuously heats up the interior which can be annoying especially in the summer time.

You can access that area by removing the trim under the rear quarter window. It's relatively easy to do - remove the screws holding the trim piece right under the window, then gently bend and twist out of the way the larger piece underneath. That will give you full access to the seat belt reel and the heater flap underneath it.

Avenger6

OR

O-I-L T-A-N-K

not sure there is a way for hot air out of the heater system to even get into that area (Not sure there ISN'T, for that matter, never dug into it), but the oil tank IS right there, and it heats up the whole area.... feel the fender after a long/spirited drive.... it gets pretty toasty, too.

ToreB

Ilko, you are wrong in your statement about the placement of the mixing flaps, and probably about the one about air leaks too.
The heat (mixing) flaps are placed behind the carpet/kick panels in both footwells. When the user require heated air on the temperature control on the CCU these opens for the heated air from the heat exchangers in the engine. It's quite normal that the door sills warm up like this when the air is flowing underneath.
There's no oil tank in the front, the oil cooler is placed in the right front fender and the pipes are routed below the door sill on this side. The right door sill may therefore get a bit warmer than the left side.
Cheers,
Tore

k722070

I think the flaps ilko is mentioning under the rear windows are the flaps that let air out of the car when closing the doors with windows up.

ilko

I've dealt with those flaps several times when installing DAS roll bars in 964s. They sit exactly under the seat belt reel and the rubber diaphragm on the flap does wear out over the years. That's all I'm going to say

k722070

they are flaps, but not for the heating system.
explanation of the flaps and some pics from bill
https://rennlist.com/forums/993-foru...ter-glass.html

MB965

Someone wrong on the Interweb, that can't be!
The flaps in question are actually check valves which only allow air leave (not enter) the interior and are the only way out for the air. There is a gap in the at the bottom rear quater window that allows air to get down to the flaps. The flaps connect to the rocker tunnel and the air exits the body in the front fenderwell, at the inside wall through a hole covered by the fender liner. Did you ever wonder what those holes were for?
I removed the flaps when I installed my DAS rollbar and covered them over with my RS style carpet. No issues with reduced airflow for my track car use, but cracking a side window will provide an air exit path if needed.
Mike

Jon93

So is it normal for the heating to occur then? Could you all check your right hand side belt after driving? 😃

Avenger6

Mine is always warm after driving for a while, then parking for 15-20 mins or more.... left side does not warm up.

I still say it is due to the proximity of the oil tank on the right side between rear wheel and door.

Lots of discussions here about flaps and valves..... anyone else CONCUR/NONCONCUR with oil tank being cause of warm seat belt??