Re-Routing Heater Hose

[Ferrino]

I've never liked the look of heater hoses in the 911 engine bay, but want to retain my heat-exchangers to defrost the windshield. I have an '84 Carrera 3.2 engine with the engine bay blower deleted, so I just have a single hose snaking from behind the fan and around the dizzy. I noticed that someone had taken the air feed from the back of the engine instead, albeit on a 3.6.

Do you think I could get away with something similar on a 3.2? Any other issues to consider, like perhaps huffing on oil vapors?

[Ferrino]

Bump.

[Ferrino]

One more try :-)

[OldSpool87]

What about a backdate?
Why you should backdate your heat on a 3.2


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[HaroldMHedge]

What about this:

With the engine heater blower removed - bypass the blower so the footwell blowers work. See Carrera - Removing Engine Compartment Heater Blower

Remove the heater air duct from behind the distributor and install a block off plate (fiberglass or metal).

Cover crossover heater tube inlet with a mesh screen hose clamped on.

[Ferrino]

Originally Posted by HaroldMHedge

What about this:

With the engine heater blower removed - bypass the blower so the footwell blowers work. See Carrera - Removing Engine Compartment Heater Blower

Remove the heater air duct from behind the distributor and install a block off plate (fiberglass or metal).

Cover crossover heater tube inlet with a mesh screen hose clamped on.

Interesting idea, but wouldn't you then have to run the footwell blowers constantly in order to keep air moving through the heat exchangers?

[HaroldMHedge]

In the configuration suggested, there would be minimal air flow through the heat exchangers when the footwell blowers are off. It may even flow in reverse since the engine fan would keep the engine compartment under a slight negative pressure.

If you wanted to keep air flowing through the heat exchangers for cooling them then you could mount fan inline. Using the footwell blowers would heat the car interior too much of the year.

A Brake Cooler Fan might work.

[Tremelune]

Many people run with no heat exchangers or air being actively blown over the headers at all. I don't think the heat exchangers offer much in the way of engine cooling.

The rear-mounted 3.6 tubing is neat. I wonder how effective it is for defrost...

[Ferrino]

Originally Posted by Tremelune

The rear-mounted 3.6 tubing is neat. I wonder how effective it is for defrost...

Me too.

[OldSpool87]

So, I'm a little confused. It sounds like you want to minimize the visibility of heater ducting in the engine bay but maintain heat/defrost capabilities in some form of functional state?

My '82 is back dated and has no fan assist other than the engine fan. All I have is defrost. The plumbing is stupid simple and effective. I have good defrost and not wanting for cabin heat in New York.

[Ferrino]

Originally Posted by OldSpool87

So, I'm a little confused. It sounds like you want to minimize the visibility of heater ducting in the engine bay but maintain heat/defrost capabilities in some form of functional state?

My '82 is back dated and has no fan assist other than the engine fan. All I have is defrost. The plumbing is stupid simple and effective. I have good defrost and not wanting for cabin heat in New York.

Yes, goal is pretty simple: keep defrost, but have no heat ducting visible in the engine bay. That excludes heat "backdates", which still have some ductwork.

[OldSpool87]

I'll shut up after this suggestion.…Most backdated use the orange SCEET/SCAT tubing which is quite noticeable. What about black tubing in an otherwise factory engine bay (black and muted metal colors). That could go relatively unnoticed and get you 90% of what your looking for at minimal cost. The pic below has black tubing but red fan shroud. Try to imagine the black on black set up. Just a thought.



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[Ferrino]

Originally Posted by OldSpool87

I'll shut up after this suggestion.…Most backdated use the orange SCEET/SCAT tubing which is quite noticeable. What about black tubing in an otherwise factory engine bay (black and muted metal colors).

Thanks for the idea - may well go that route, since the alternative air feed idea could be a lot of work only to find out there is not enough flow. The other idea I had was to make a fiberglass extension to the duct, so that it's all one-piece from the fan to the engine tin. Kind of like the fancy carbon ducts made for the 3.6:

[pampadori]

That surely is noticeable. I always thought the scat10 hose looked pretty dang cool.

2 winters ago I drove my car with no heater hoses hooked up. THe heat exchangers were still connected to the chassis duct work however and going over 35mph was enough to move some warm air into the cabin. Not sure it is enough to defrost the glass but purchase the blockoff plates and see for yourself.