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Heater Delete w/ Heat Exchangers
Im working through detailing my engine compartment and am removing unwanted componentry. I've already removed the non-op AC and Cruise Control, and wondering if it would be worthwhile to pull the heater hoses and blower from the engine compartment, I think it would help tidy things up in the engine compartment and improve accessibility in there.
Two questions- 1) what to do about defrost? This is a 99% street car and I will be driving on rainy days, is there a way to use the fresh air blowers in the front to defrost the windshield? I dont mind losing the passenger heat, it doesnt blow hot at all, but the defrost... 2) What will happen with the heat exchangers? New headers are not in the budget any time soon, what will happen if I pulled all the hoses and had the open holes in the heat exchangers? Is that ok, not ok? Just toying with the idea of pulling everything, needing some insight. thanks everyone |
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Join Date: Jan 2004
Location: Sin City
Posts: 1,652
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An enthusiast after my own heart...my little project is based on stripping everything out of the car that doesn't make it legally go down the road. I thus also pulled the AC and heating system components, as well as a lot more...
But yes, you have to do without a reasonably functional defroster if you don't have the warm air source. Cool air alone gets mixed results at best. To make up for this when I absolutely need these things, I am looking into various electrical heating options. I am trying to find a 12V heating element with integrated fan, essentially like a hair dryer, that could be engineered into the system to at least put warm air on the windshield and about the seating area. I am figuring I should ideally install a high-output alternator first, though. If you leave the heat exchanger and/or air duct holes open, you will invite debris, water and/or critters. There have been many approaches to sealing these - do some searches here... BTW, in addition to simply not using the heat exchangers: if your heat exchanger bodies are rusty, or if you can get a hold of a rusty pair, you could do what I did - cut the heat exchanger housings off the manifolds, and voila, headers.
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2018 911 Carrera coupe 1972 911T targa |
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Join Date: Apr 2002
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There are a few ways to approach this depending upon your year. In my case, enough heat comes forward with everything removed. You've may have a valve stuck "closed" in the flapper box if you have no passenger side heat/defrost, but something "isn't right". Do a search on "heater backdate", etc. as there are several threads with the options depending upon what you have.
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My exchangers are currently rust and corrosion free, would I be out of my mind to just cut them apart? I'll do a search for sealing them up first but that doesn't sound that bad... Quote:
Last edited by zevenbergena; 05-18-2008 at 08:04 AM.. |
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Check out this photo. This is what I did, along with footwell blowers for cold days. I'm trying to work out a way to get some filtration for the air.
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'77 911S w/'81 3.0/MegaSquirt/MSD '81 911SC stock |
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Some people use half a soda/beer can to cap off the heat exchangers. In the engine compartment, you need to block off the duct coming off the engine shroud next to the distributor. If you leave that open, it will allow cooling air meant for the cylnder heads to escape. You can either find a way to cap off the duct or you can track down a used or new replica of the (left) engine shroud blockoff plate. But, the best way to go is a heater backdate (as mentioned above).
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In the footwell blower area (behind your map holder area carpet) you could put in footwell blowers for lower heat or run straight hose for defog/defrost only. I chose footwell blowers. I will eventually hook up individual switches for left and right blower to control the heat instead of relying on engine speed alone.
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'77 911S w/'81 3.0/MegaSquirt/MSD '81 911SC stock |
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