H2

Attached is a foto of an '88S4 5-speed alternator that I just bought. The cooling pipe is missing (that directs cool air down to alternator). I looked in PET and saw two numbers/sizes listed. I hate to order the wrong one. Were there two sizes in '88? It's oval shaped and 2" x 2-1/2".

Also, does anyone have the used part that's missing FS?

Thanks,

Harvey

Lizard928

I think you have an oil leak, however I would recommend just finding a similar size pipe/ducting and install.

Tony

You're missing a small section of foam also

H2

It's not oil...it's PS fluid I think. Engine's tight...something on that side's not. I haven't checked that out yet. Only leak I've found on the car. Oil pan and Cam covers don't leak...luckily.

Harvey

Tony

Check the line from your PS resivour. It sits above and "up wind" of the alternator

Mrmerlin

that cooling pipe that your talking about is for the outside temperature sensor system if we are talknig about the flexible hose. that is not in the picture.The hose is clamped to alternator and then to the front side of the left front innner wheel housing block off plate and it is tied in with the HVAC system air is sucked with the alternator fan down this tube it also provides cleaner air to cool the alternator due to the fact the inlet it is away from the road surface. The power steering leak is one of two hoses that run from the resivour, if either one is leaking you should replace both of the hoses, one can be purchased as a replacement part, it is curved and about 14 inches long, the other one will require you cutting the factory metal collar off to remove the shorter piece of hose (about 8 inches long) use a dremel with a cut off wheel to cut the collar, you can also replace the resivour after flushing the system as the resivour has a non replaceable filter

michaelathome

When installing it try to pay attention to the coolong pipe routing, if not routed correctly it can impare the operation of the driver side headlamp.

Michael.

heinrich

There's a clamp on the tube??

mcholdfast

Yes, on the White S4 anyway. I noticed when I was diagnosing the nonfunctioning heater temp selector. It turns out there's two types of plugs for the exterior temp sensor and it wasn't connected.
Harvey, if you have to replace your temp sensor, take a look at the plugs. The sensor had been replaced with one from 928 Int. ("928 Int" in black marker) and the plugs weren't compatible. The male end required a cutout on the female end and and it didn't have a cutout.

JP Rodkey

It's a 'W' shaped metal strap that holds the air tube in position against the fore plastic wheel shield, held there with two phillips screws. The PET shows it, but I'm too lazy to attach the pic. The tube rises up into the fender well and forms a 'U', which is why the 'W' shape. That is to prevent water/crud from being drawn into the alternator - sorta a snorkle effect. There is also a small plastic clip that holds the temp sensor wire in place, and it's often missing. If yours is not there, it's easy to use a wire tie instead.

Rob Edwards

Harvey-

To get to your original question, there are 2 separate pieces of round duct, both are the same dimension. My lower duct was trashed from leaky P/S fluid, so I bought a 4 foot section of 2.5" (inner diameter) from here:

Old Car stuff

Click on the store link and look for defroster duct under the category list.

This duct fits nicely on the alternator shroud. It is a tight fit where it passes near the lower A-arm mount- I had to clamp a few wraps' worth of the wall of the duct in some needle-nose vise-grips in order to pull it thru, but it works nicely. Much cheaper than the OEM duct.

Bill Ball

The clamp is on the end inside the fender, but not on the alternator end. If the tube is cut the correct length, you cannot put the clamp end together unless you leave the other end off the alternator to provide some slack, then reattach it after you've finished with the fender end.

The PET shows two hoses with the latter in parentheses. The first hose is listed as 320mm --- that's 13". That is the section of the hose that forms a loop in the fender clamp after the sensor section. You probably don't need that. You need the 900mm length 926.603.143.04. It's not cheap. I believe Dave A ordered this hose as a generic piece from McMaster. I believe it is 2 1/2 inch. Dave?

Edit: I see Rob beat me to it while I was trying to track down the hose at McMaster. Anyway, you need 3 feet of this: http://www.oldcarstuff.com/cgi-bin/c...KIE:prodAD250+
That's 1/3rd the cost of the hose from Porsche.

ew928

The "snorkle" can also be attached to the crossbar in front of the left side wheel well cover. The snorkle is normally routed in front of the crossbar and then attached to the wheel well cover plate. That's a real pain to get the machine screws onto the clamp on the wheel well cover. Attaching the snorkle to the cross bar allows the wheel well cover to attach and detach much easier without wrestling with the snorkle.

At least that's what I did last time I tackled the wheel well covers.
Also replaced the front marker light bulb while I was in there.

Ernest (NYC)

Bill Ball

Ern, if you just pull some hose into the fender area (detaching the other end from the alternator first), its easy to attach the loop bracket to the correct spot. Install the liner and pull the hose back into position on the alternator. Otrherwise, yes, it's a bitch.

ew928

Thanks BB,
My liner is so abused (thanks, PO) that it's probably safer attaching the snorkel to the cross bar. That's a lot stronger than the fragged plastic liner.

Ernest (NYC)