Porsche Enthusiasts Club Forum

Does anyone know where I can get one of these (Heater flap control motor), It's a Denso part 063700-1001? It's for my S2 that has no heater control, and I've narrowed it down to this part that is not working...My car has the Automatic temperature control climate system (non AC) and i think this part must get an extra hard ride!

http://www.ebay.co.uk/itm/331320441264

Are you sure it's not the clips come off?, there are 3 in total if I remember correctly one is only visible with unit removed

I bought a perfectly good, used heater flap motor (the lower one, nearest the front of the car) from Porscha-Recycled for less than £20 posted back in August. It wasn't listed on their eBay page but they had them in stock when I called.

Michael

What were the symptoms Beastie??

Not wanting to thread hi-jack but I have only hot air in my cab just now. I replaced the broken clip but still the same. The rod with the replaced clip does not move when I turn the heat dial. I do seem to have movement when I move air direction sliders which seem to function fine. Any ideas?

O/P maybe my issue and your issue are somehow related?

Cheers

Stuart

When mine stopped working I opened it up and cleaned and regreased it. That was about 4 years ago and it's still working. Can't remember exactly how it comes apart but it wasn't difficult - some screws and I think some tabs that you have to bend. Make sure the gear wheels are put back correctly - photos obviously help.

Thanks for the responses and suggestions.....



I hoped it would be just that but no all clips are present and accounted for!




Thanks, I will try and give them a call in the week.







In a similar manner, I am getting No Heat. The heater control valve is open (i.e. letting hot water into the heater matrix). I disconnected the rods, and voila heat into the car. I.e. motor is stuck or not receiving correct signals.

On the system i have the control unit monitors the temperature of air outside the car (engine bay sensor), temperature in the car (via vent, tube and sensor behind the dash. According to the manual, as long as the temperature of air outside the car is less than the temp inside the car, the contol unit will adjust the flaps to keep temperature constant.

I figured that if i took off the motor and tested it with a 12v source i could rule that out. I couldn't get it to turn at all. I opened it up, it is all greased up, but no movement. So I figure its the actual electric motor bit..

All the direction motors work, but these are not under constant use. I figure as it's got a bashing over time the motor needs replacing. I will check my other 944 and see if its the same part. That will allow me to rule out or confirm its the motor, but still would leave me with the problem of a duff motor.

Stuart - Check your heater control valve in your engine bay is moving in and out when you turn your temperature dial all the way to hot or cold. If there is no movement, either valve is bust (fails open) or its not receiving vacuum to pull it closed.

I might look at that myself - I can't get my heating to give me a constant temperature in the cabin, even when the control knob is at minimum I'm still getting heat out - admittedly not such a massive problem at this time of year - but is variable between warm and mentally hot...

G

I started out with a similar problem. From reading many forums and manuals there are multiple causes. So far the possibles I have found include:
Heater Control Valve (plastic and known to fail)
Vacuum to heater control valve (vacuum line, no vacuum means constant hot water to heater matrix I think - i.e. no really cool air)
Vacuum check Valve (blue/black one)
Temperature sensors (3 off - 1 engine, 1 interior behind small vent and one behind main dash vents)
Vacuum solenoids on heater box
Heater flap control motor,
Clip for heater flap control rod.
Heater control unit (in dash)

It looks like I am going to need to start checking these all off!

Food for thought there cheers! Where is the heater control valve in the engine bay so I can check it?

Stuart

On the 16V models it is next to the oil filter:


Different on the 8V models, behind the cylinder head, over the clutch bellhousing I think?

Cool. The cab is 16v. How do you check it's ok?

Stuart

An update to all that are interested....

Heater flap control motor has been changed for a working one from my other 944. Still no joy though.

However I have checked the temperature sensors, and the external one is reading the outside air temperature to be approx 18 degrees. It is 6 degrees outside currently, so I think I have identified one broken link in the chain.

The internal sensor is reading approx 6-10 degrees (which is accurate). According to the workshop manual, the system will not work if outside temp is greater than inside temp.

So next stop a new external temp sensor!

The valve is vacuum operated. So, as you operate the heater control the rod and arm on the valve should move (see photo). When open, the output pipe temperature should increase as hot coolant flows to the heater rad. So, get someone to operate the heater while you check the valve operation...

Cheers. Will check tonight.

Stuart