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Another Autoheat post for Carrera

I have a 1985 Carrera and since ever my booster fan on number 9 on rotary switch does not work.
Everything else 1-8 works FWB all ok just when i put the 9 on all FWB stop.
I di some reading over the weekend all the way back to 2005 posts by Mystery train and AJ88....addressing several problems.
On my front trunk black relay for the booster fan ,if i cross 87 to 87a the fan kicks in.
87a has a power from 30 and 87 is a ground.....
Also idea was to disconnect the resistor middle wire to bypass it.But it is almost impossible to remove the wire from it....
Any ideas ...?

Ivan
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1985 911 with original 491 115 miles..790 372km.
Old 02-12-2018, 10:15 AM
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nobody? where is timmy2....??
Ivan
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1985 911 with original 491 115 miles..790 372km.
Old 02-12-2018, 09:57 PM
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Auto heat.

pm me.

Gerry
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Old 02-13-2018, 06:24 AM
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Don't use #8 use the other 7.
Old 02-13-2018, 06:45 AM
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don't use 9,
fan speed is still the same for 8 as for 9...well not yours since 9 is off.

problem is the switch at the controls most likely.

that relay is for hi speed only.

there are only 3 speeds, low med and hi.
hi is 10
med is like ,8 and 9
and low is 1-7
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Last edited by T77911S; 02-13-2018 at 08:56 AM..
Old 02-13-2018, 07:02 AM
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thank you for re: boys..but the number 9 is the only speed with boost...number 8 is just a little faster then 7 ...let`s say i would driving early in the morning and the car would be outside over nigh(none of this will most likely happen) and i wanted to defrost the front windshield asap the booster will do this..yes i do know use the fresh air fan instead....

Like i have written i never use the 9 in 20 years but reading and having time on my hand i wanted to fix something;-)

T77.. i thing once before i played with this i have tried different -complete auto heat box and it was the same..still ..i`m thinking ground somewhere ...
Ivan
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1985 911 with original 491 115 miles..790 372km.
Old 02-13-2018, 08:12 AM
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no
I have taken it completely apart and know how it works.
if you want to def. or hi, use "10"
8-9 are all the same speed. MED
1-6 is LOW
I correct myself on the low.

here is my post, if you want more info than you know what to do with then click on the first link I posted.

auto heat- foot well blowers part deux.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
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08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:

Last edited by T77911S; 02-13-2018 at 08:56 AM..
Old 02-13-2018, 08:49 AM
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t77..ok i will dig into it

thanx

Ivan
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1985 911 with original 491 115 miles..790 372km.
Old 02-13-2018, 09:03 AM
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Lol, I really know nothing about the inner workings of the autoheat system.
Never had a car with it, so haven’t had to work on one.
I’ve seen a lot of posts about them over the years. That is about all I know...
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Old 02-19-2018, 01:05 PM
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hi Dennis..thanx for re:

Ivan
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Old 02-19-2018, 01:22 PM
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t77...i hope i will ketch you..opening again can of worms here;-)

Now ,we have here extremely high temps..above 30 Celsius..i had an idea to put on my heater a guess what it would not even come on.I have 2 sensors, 3 central heating unit chip plates..I would just not get any power to the back relay.So after trying all possibilities i finally put the sensor (between the sun visors) in the freezer and once i have plugged it in all worked fine.

So the Q, is is the heater supposed to work even if the outside temp is hot?

To be honest i have never tried before...in summer

Ivan

both sensor will activate the auto heat system if i put them in the fridge...
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Last edited by proporsche; 08-24-2018 at 12:05 PM..
Old 08-24-2018, 12:03 PM
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Well? today the temp dropped to 24C and my auto heater control unit works again...interesting...

Did not know that when is hot outside the sensor will not allow the heater to come on??Or am i missing something?

Ivan
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1985 911 with original 491 115 miles..790 372km.
Old 08-25-2018, 09:38 AM
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I would assume it is like a thermostat in your house for your heat/AC. if the house temp satisfies the setting on the thermostat the heat/AC will not come on.

the temp sensor in your car could be sending bad temp readings to the autoheat or the temp inside your car is actually hot enough to satisfy the heat setting.

I don't think anyone has actual knowledge of the electronics side of the autoheat(AH) as I have never seen a schematic. from what I can assume the fan speed dial setting corresponds to cabin temp settings but I dont think anyone knows what the actual temps are as in does a setting of 8=24C, 9=26C and so on.

try unplugging the cabin temp sensor and see if it comes on when it is 30c outside.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 08-27-2018, 02:57 AM
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hi..yes it is weird...i just never experienced for the heating not to be able to put on when is hot...I have to sensors and i would think one of them is ok.
I`ll dig up the wiring diagram, i have it somewhere....
i c, i will connect the sensor to an el. loop and what it does..to be continued..
thanx

Ivan
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1985 911 with original 491 115 miles..790 372km.
Old 08-27-2018, 03:22 AM
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