Pelican Parts Forums - Disabling Auto Heat

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- - Disabling Auto Heat (http://forums.pelicanparts.com/porsche-911-technical-forum/1172494-disabling-auto-heat.html)

Quote:

Originally Posted by steven c (Post 12390083)

Dave,

Thanks for your help. I have owned the car for 10 months and got to drive it for about a month or two before the old broken head studs gig was discovered. And it's been apart since. If the footwell blowers will not work without the temp sensors as I understand, I will not be taking the headliner and interior apart to run a new used wire to the interior one anytime soon. This is a 47K mile car and I will not be driving it in any type of bad weather so for me just having heat will work fine. I almost went the heat backdate route but just couldn't do that to this car.

I do most of my repairs that don't require too much room as I am space confined. But chances are once I get past where I'm at now and start enjoying the car I will end up repairing the rest of the system. Yesterday, I rewired the power to the radio since they had 12v constant and 12v from the ignition switch backwards from the Alpine 90's install, causing the loss of all programmed radio stations every time you killed the motor.

Thanks again to you and everyone else for the very valuable assistance, I understand the system now better than reading all the threads. as I did!

The interior temp sensor can actually be located at the dashboard level and still provide functionality.
It also can just be replaced with a 1.5K resistor, resulting in reduced temp regulation.

Quote:

Originally Posted by mysocal911 (Post 12390102)

The interior temp sensor can actually be located at the dashboard level and still provide functionality.
It also can just be replaced with a 1.5K resistor, resulting in reduced temp regulation.

Very helpful again, thanks!

BTW, what beer do you like(as I try to lure you over):)

Quote:

Originally Posted by mysocal911 (Post 12390097)

The OP's '81 911SC uses a different heating system than the 911 3.2, i.e. no heater relay like the 911 3.2.

Thanks! Didn't know they were different. But how come his car (SC) has footwell blowers? I always thought these were introduced with Carrera 3.2.

Quote:

Originally Posted by wazzz (Post 12390118)

Thanks! Didn't know they were different. But how come his car (SC) has footwell blowers? I always thought these were introduced with Carrera 3.2.

You are correct, i.e. it was only the 911 Turbo that had the additional blowers.

I thought I had read that my car would not have the footwell blowers. Thanks for looking that up. So for the rear heat tube thermometer what option is there that doesn't cost $400 for a new one? Mine is 100% dead.

Thanks

Quote:

Originally Posted by steven c (Post 12390386)

Yes, maybe start from post 16 here.
Haven't read it all, but it doesn't look like it is rocket science. Friend of mine followed this for his own car and it worked fine.

Quote:

Originally Posted by steven c (Post 12389690)

I had it that way but it would not turn the blower on that way. To get the blower on the Mico switch on the auto motor has to close.

Not true on the first gen turbos.
The lever connected to the thermostat will continue to rise and fall as the temperature dictates.
Blower fans will continue to operate as intended.

Quote:

Originally Posted by steven c (Post 12390386)

I thought I had read that my car would not have the footwell blowers. Thanks for looking that up. So for the rear heat tube thermometer what option is there that doesn't cost $400 for a new one? Mine is 100% dead.

Thanks

For testing and quickly checking the full operation, just use a 1.5K resistor in place of the thermistor. The linkage should move back and forth as the temp knob is rotated.

Thanks Dave, it moves completely thru the range with both sensors unplugged so I will use it this way for now. Someday the rest possibly.