Engine compartment blower

[Guest]

Anyone ever had a problem with this part of the automatic heating system?

I think mine has burnt out, although I still get heat in the car. I can't hear the fan anymore so I suspect it is this. It looks straightforward to remove and Eurocarparts stock replacements for about £150.

 

[bones]

Brian the 3.2 benefited from an better heating system than previous 911s but only marginally so, the engine mounted heater /blower motor aids heat in the cabin mainly at standstill, once on the move you will still get hot air in the cabin as the engine fan is rotating fast enough to pump loads of cold air into the heat exchangers and hence hot air into the cockpit. It's common for these motors to fail but if you are sure it's the motor and not a fuse you may be able to save yourself a lot of money by buying secondhand, there must be loads available in breakers.

 

[Guest]

Thanks Bones.
I've checked all the fuses. I'll probably buy a new replacement, the logic being that it might last as long as the current one - 16 years.

 

[bones]

I hope a new one does last 16 years Brian the thing is I have that over the last five years some electrical items I have bought new have failed way before when you expect them to.

 

[Guest]

At the risk of offending; it's a common response to just throw more money at the problem?
I found the blower on mine had ceased to work,only to find the plug had come out. expensive plug?

 

[Guest]

Did yours smell of burning when the plug had fallen out? [8|]

 

[Guest]

Hi Brian
Good article on 911 heating systems in Januarys 911 & Porsche world mag,something I think all of us could benefit from in it.
Going off their diagnostic wisdom,if you have considerably more heat whilst on the move(i.e higher R.P.M and subsequently higher engine fan speed) than when you're stationary then it sounds like you are correct in you're prognosis.
Stay cool[8D] or would you prefer to keep warm?[]
Ian

 

[Guest]

I would be a little concerned why the fan mtr has burnt? Was something injested into the fan, ie a leaf or something?
The fan is switched by a relay, located in the engine bay, under the plastic cover on the left.
These mtrs often go stiff from lack of lube- easy to fix.

 

[Guest]

Thanks Peter - that's the sort of advice I washoping for.
Ian, I shall check January's 911 & Porsche World as well.
Any other constructive advice - e.g. best way of checking the motor (in situ/out of car)?

 

[Guest]

Hi Brian,

If you like we could swap yours/mine over and see if it works. Let me know if you want to give it a try.

Cheers

Andy

 

[Guest]

Do you happen to know if there is a relay for the heater blower? If so, any idea which it is?

Regards, David.

 

[Guest]

Whilst all of you experts are at it perhaps you can diagnose this. It's too hot on the dial between the seats on setting 1 but does switch off on zero. What should I look for?

 

[Guest]

David,
the blower relay is located in the left side of the engine compartment, under the plastic lid. I think its the largest tin box in there? Fairly complex relay - with multiple gang switches?
Ian,
Hi there Dude - long time no see?
Some one I know very well (yours truely) wrote an article which appeared in last March issue - the one with a 959 on the cover. Check that out. Sounds to me like the thermostat under-behind the ashtray is ka-put. If the control unit (between the seats) has no feed back from the 'stat, then the heater goes wide open. Could be something simple like the plug has come off the thermostat - open circuit.
Have you a wiring diagram?
check it out.