Heating System - 3.2 Carrera
#16
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OK, thanks, I'll try that. Just so you know, I don't have the automatic heating. I only have the 4-position switch and 2 red levers. I'll give it a shot and let you know how it goes
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#17
Burning Brakes
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Have you considedered 'backdating the heat', and getting rid of all of that crap...you'll still get PLENTY of heat. It was 20 degrees on the drive in to work this morning, and I only raised my center levers a bit to be comfortable. Here's a link to what I did:
http://forums.pelicanparts.com/showt...light=backdate
Keith
'88 CE coupe
http://forums.pelicanparts.com/showt...light=backdate
Keith
'88 CE coupe
#18
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Originally Posted by KC911
Have you considedered 'backdating the heat', and getting rid of all of that crap...you'll still get PLENTY of heat. It was 20 degrees on the drive in to work this morning, and I only raised my center levers a bit to be comfortable. Here's a link to what I did:
http://forums.pelicanparts.com/showt...light=backdate
Keith
'88 CE coupe
http://forums.pelicanparts.com/showt...light=backdate
Keith
'88 CE coupe
#19
Burning Brakes
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Originally Posted by murphyslaw1978
Yes, you're the 3rd person to have mentioned this to me, but I guess I'm still a bit unclear that it is worth the change. I am under the impression that to get it to really work well, you have should backdate the heat exchangers or go to new ones (from SSI).... .
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Keith
'88 CE coupe
#20
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Originally Posted by KC911
Threre's a reason it's continually mentioned
! On a Carrera, you simply remove the blower in the engine compartment, install a "left side hot air duct" (a 930 part works great, see my pic), and a tube to connect to the rest of the 'stock' system'. Removing the front footwell blowers is optional, and all of this could be returned to stock with minimal effort. You will still get PLENTY of heat, trust me....
Keith
'88 CE coupe
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Keith
'88 CE coupe
#21
Burning Brakes
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I think you've got it now. No changes to the heat exchangers for a Carrera. Yes, if you remove the engine compartment blower, the footwell blowers will be inoperable unless you follow Mysterytrain's (or other's) solution for a workaround (I personally haven't heard of any being fried). In my case, stock heat (with all blowers working) was WAY too effective, and very much overkill. Like I posted earlier, I drove to work in 20 degree weather this morning, and I was still 'toasty' with my backdated setup. That being said, I really did my backdate in order to 'clean up' the engine compartment, and it was part of a 'diet' that I put my Carrera on (losing about 200lbs total). That was the real reason for me ![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Keith
'88 CE coupe
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Keith
'88 CE coupe
#22
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Originally Posted by KC911
I think you've got it now. No changes to the heat exchangers for a Carrera. Yes, if you remove the engine compartment blower, the footwell blowers will be inoperable unless you follow Mysterytrain's (or other's) solution for a workaround (I personally haven't heard of any being fried). In my case, stock heat (with all blowers working) was WAY too effective, and very much overkill. Like I posted earlier, I drove to work in 20 degree weather this morning, and I was still 'toasty' with my backdated setup. That being said, I really did my backdate in order to 'clean up' the engine compartment, and it was part of a 'diet' that I put my Carrera on (losing about 200lbs total). That was the real reason for me ![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Keith
'88 CE coupe
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Keith
'88 CE coupe
#23
Burning Brakes
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200 might be pushing it (haven't had her on scales yet) but I'm real close. Heat backdate, total a/c system removal, engine sound deadening pad, spare tire/jack removal, lighter battery, windshield cleaner system removed, stereo system removed, and a few other things here & there....it all adds up. My 'Carrera pig' isn't quite as plump anymore, and it makes a BIG difference
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#24
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I might replace that spare tire with an AAA membership as well...
#25
Racer
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Just one caveat - if the engine overheats the rear blower is set up to auto-run in reverse to help cool things down. Anyone know how much that helps, or hurts to not have it?
#26
Burning Brakes
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Originally Posted by der Mond
Just one caveat - if the engine overheats the rear blower is set up to auto-run in reverse to help cool things down. Anyone know how much that helps, or hurts to not have it?
#27
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The rear blower will indeed come on if the engine temperature is too high. It will stuck cold air from the intake/fan area and push it through the heat exchangers. I believe the engine compartment relay circuitry does this. It does this regardless of the positioning of the exhaust valves.
#28
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Originally Posted by murphyslaw1978
In any event, the manual says very little about these controls,.... is there someone who knows all about these systems?
Have you ever read this Renner's Site ? It's informative and funny too.
http://members.rennlist.com/imcarthur/911autoheat.htm
http://members.rennlist.com/imcarthur/911autoheat.htm
#30
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a couple years and a whole lot of people worked out the footwell work around without the rear blower. It works well. I use one footwell for heat and thats it. Both sides of shroud on the engine are blocked off and my ssi's are open ended. I use the footwell to pull from the rear and push into the cabin on one heat exchanger, Plenty of heat.
There isn't a reverse on the engine compartment blower, but it does come on, or did when new in high heat situations. The footwell blowers in stock configuration with the rear blowers run full time in an idle (very slow) speed. which translates into mild heat in the cabin IF your flappers or levers are not in good working condition. The fuses on the footwell blowers are needed for fire prevention, there are a some stock ones out there that didn't come with a fused link from the factory. They will catch fire, as does the condensor blower next to the battery if not fused.
IF your rear blower is shot, NO heat is the result.
imcarthur has great info on his rennlist site
There isn't a reverse on the engine compartment blower, but it does come on, or did when new in high heat situations. The footwell blowers in stock configuration with the rear blowers run full time in an idle (very slow) speed. which translates into mild heat in the cabin IF your flappers or levers are not in good working condition. The fuses on the footwell blowers are needed for fire prevention, there are a some stock ones out there that didn't come with a fused link from the factory. They will catch fire, as does the condensor blower next to the battery if not fused.
IF your rear blower is shot, NO heat is the result.
imcarthur has great info on his rennlist site