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Hi Mark

Sit in quiet garage or quiet street, engine off, ignition on. Start with temp slider in full cold position (bear with me - I know you're chilly).

Move slider to full hot. Can you hear motor running just above your left knee?

If you hear it run, stick head if footwell and shine torch up into area where driver parcel shelf meets console. Do you see motor arm rotating when you slide from cold to hot? Is metal arm attached to motor?

Please report back on results!

Cheers

Adrian

Hi Mark
Sorry i think i have misread your problem i thought you meant the engine was,nt getting up to temp and that your heater was not getting warm enough .as Stratford Shark says it may be the heater slider motor mechanism
Cheers Grahame

stratfordshark wrote:

Adrian, sorry to sound stupid :-(

the fan is running, but i cant see the motor.
Theirs a black plastic box with a silver arm is that anything to do with it?

Thanx mate :-)

Mark

Author:	mark280 [ Sun Dec 18, 2011 9:50 pm ]
Post subject:	Heating
My air con dosnt work but thats not the problem!!! On my 928 s4 1987 The heating dosnt get very hot, its a nightmare in this cold weather, any ideas whats wrong? Many thanks Mark

Author:	Brett928S2 [ Sun Dec 18, 2011 9:59 pm ]
Post subject:	Re: Heating
Hi Mark Not sure if this helps but I have no aircon...all stripped out, and my heating is roasting hot when needed.... All the best Brett

Author:	stag estate man [ Mon Dec 19, 2011 12:01 am ]
Post subject:	Re: Heating
Hi Mark I am having the same problem with my 87 s4 and on further investigation i have found that the heater flaps have been cable tied in the fully open position . they should be electronically controlled .the linkage rod has broken on mine so i shall try and make up a new one. This could be the same problem with yours When mine is warmed up it does not get into the middle section on the gauge Cheers Grahame

Author:	mark280 [ Mon Dec 19, 2011 9:20 pm ]
Post subject:	Re: Heating
Grahame, thank you for your advice!!! i will have a look over christmas All the very best Mark

Author:	stratfordshark [ Mon Dec 19, 2011 9:39 pm ]
Post subject:	Re: Heating
Hi Mark Sit in quiet garage or quiet street, engine off, ignition on. Start with temp slider in full cold position (bear with me - I know you're chilly). Move slider to full hot. Can you hear motor running just above your left knee? If you hear it run, stick head if footwell and shine torch up into area where driver parcel shelf meets console. Do you see motor arm rotating when you slide from cold to hot? Is metal arm attached to motor? Please report back on results! Cheers Adrian

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Heating https://forums.tipec.net/viewtopic.php?f=27&t=12054	Page 1 of 2

Author:	stag estate man [ Mon Dec 19, 2011 9:52 pm ]
Post subject:	Re: Heating
Hi Mark Sorry i think i have misread your problem i thought you meant the engine was,nt getting up to temp and that your heater was not getting warm enough .as Stratford Shark says it may be the heater slider motor mechanism Cheers Grahame

Author:	mark280 [ Tue Dec 20, 2011 9:26 pm ]
Post subject:	Re: Heating
stratfordshark wrote: Hi Mark Sit in quiet garage or quiet street, engine off, ignition on. Start with temp slider in full cold position (bear with me - I know you're chilly). Move slider to full hot. Can you hear motor running just above your left knee? If you hear it run, stick head if footwell and shine torch up into area where driver parcel shelf meets console. Do you see motor arm rotating when you slide from cold to hot? Is metal arm attached to motor? Please report back on results! Cheers Adrian Adrian, sorry to sound stupid the fan is running, but i cant see the motor. Theirs a black plastic box with a silver arm is that anything to do with it? Thanx mate Mark

Author:	mark280 [ Tue Dec 20, 2011 9:28 pm ]
Post subject:	Re: Heating
stag estate man wrote: Hi Mark Sorry i think i have misread your problem i thought you meant the engine was,nt getting up to temp and that your heater was not getting warm enough .as Stratford Shark says it may be the heater slider motor mechanism Cheers Grahame Grahame, thank you for your interest All the very best Mark

Author:	stratfordshark [ Tue Dec 20, 2011 9:55 pm ]
Post subject:	Re: Heating
mark280 wrote: stratfordshark wrote: Hi Mark Sit in quiet garage or quiet street, engine off, ignition on. Start with temp slider in full cold position (bear with me - I know you're chilly). Move slider to full hot. Can you hear motor running just above your left knee? If you hear it run, stick head if footwell and shine torch up into area where driver parcel shelf meets console. Do you see motor arm rotating when you slide from cold to hot? Is metal arm attached to motor? Please report back on results! Cheers Adrian Adrian, sorry to sound stupid the fan is running, but i cant see the motor. Theirs a black plastic box with a silver arm is that anything to do with it? Thanx mate Mark Hi Mark Not at all - I should have been clearer. The motor I referred to is mixing flap motor, which adjusts amount of outside air and air warmed by heater matrix blown into cabin. Keep fan off to help listen for sound of this motor. Yes you've spotted the mixer motor! Is there a thin metal rod attached to silver arm? That's connected to mixing flaps at top end. If rod is present, is the silver arm rotating when you move the temp slider from full cold to full hot, then reversing when you move back to full cold? Cheers Adrian

Author:	mark280 [ Tue Dec 20, 2011 11:13 pm ]
Post subject:	Re: Heating
Adrain, what are you doing too me? lol im laying in the car upside down in the dark with my dressing gown on lol the fan isnt running if i just adjust the temp, also the bar dosnt move Thanks Sir All the very best Mark

Author:	stratfordshark [ Tue Dec 20, 2011 11:33 pm ]
Post subject:	Re: Heating
Sorry to put you in uncomfotable position Mark! The fan only controlled by rotary knob. You can keep it off during these tests. So the setting motor (black plastic box with silver arm) doesn't move when you adjust temp slider? Is rod attached ok to short silver arm? If motor not moving at all then you may need replacement, or existing can be repaired (simple transistor comparator circuit inside - a tranny probably blown).

Author:	mark280 [ Tue Dec 20, 2011 11:44 pm ]
Post subject:	Re: Heating
Adrain, Thanks mate!!! The knob you turn dosnt do anything So maybe its just the knob? Other wise what should i ring Simon for in the morning? All the very best Mark

Author:	stratfordshark [ Wed Dec 21, 2011 9:10 am ]
Post subject:	Re: Heating
Knob/blower speed not related to actual temp control system. Does mixing flap motor move when you move temp slider between extreme positions? Is mixing motor connected to thin metal rod?

Author:	mark280 [ Fri Dec 23, 2011 8:21 pm ]
Post subject:	Re: Heating
Adrain, im not sure what i should be looking for. Im going to have another look, should i be looking at the metal rod thats connected to the small black box? to see if its connected at the other end All the very best Mark

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Author:	stratfordshark [ Fri Dec 23, 2011 9:13 pm ]
Post subject:	Re: Heating
Hi Mark Yes you are looking at the right box. The black plastic box houses the setting motor for mixing flaps. When you have a look let me know: - when you move temp slider between max hot and max cold, what does the arm driven by black plastic box do? - is metal rod connected to end of arm? For this test ignition should be on (warning lights lit on dash), but engine off.