Pcoh1

1991 964 - I noticed the left heater duct has separated from the rubber connector coming out of the engine cooling fan. What effect will this have and any tips on how to reconnect it? It's a very tight fit to the rubber piece.

ThomasC2

What do you mean with the left heater duct? The orange rubber sleeves under the engine connecting the heater pipe with the heat exchangers? Or the rubber connector on top of the engine cooling fan holding the pipe for the electrical fan?

Gus

Post photo of issue area-

mrmandmman

He means the connection from the blower to the top of the engine. I struggle to get that connection to fit properly too. Try loosening the fan bolts (there are two) a few threads and pushing it back together.

jimq

its a lot easier if the heater fan is lose as stated previously.

Pcoh1

Thank you, I'll give the suggestions a try.

Pcoh1

What impact does this have? Heater won't work, anything else?

Bertrand

Mine does not fit on one side of the hard plastic tube / rubber boot connection.
There must be a 1mm gap on that side.

It does not affect anything since I still have the electric blower sucking the air blown by the main fan.

tdiquattro

The main engine mechanical fan will move a little left and right if you loosen the band, also the shroud will move slightly if you loosen the little 10mm bolts. You can then adjust the position of the "hole".

If you have had a 993 fan fitted in the past, the spacers are longer on the 3 fixing bolts, these might need shortening. Try shortening the spacers a little to move the fan closer.

FeralComprehension

This was the source of the issue for me; thanks to help from the fine folks hearabouts I was able to fix it right up.

Mr.Alex

Its designed to push hot air into the heat exchangers and then into the cabin. Other times the flapper valves will also dump hot air out into your rear fender wells so it doesn't just sit there around the headers. The rear blower is there in case of hot temperatures in those areas when you turn the car off, it would then remain running to help dissipate the hot air in the heat exchangers. It would make no sense and kind of be counter intuitive to delete everything if you retain the original heat exchangers. You can do the RS bypass route and delete the blower, which will kind of clean up the engine bay a little. This way you retain the heat. However, those bypass pipes also have a lackluster fitment reputation.