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Front Blower

Steve Humphreys

Steve Humphreys

New member
My car doesn't have A/C. As you will spot I am working through a series of niggles with my car---the one that I am no trying to tackle is the front blower---the blower isn't working and therefore, the controls heat/fan do not work---I checked through both fuse boxes--the 30A at the back is there and OK the rear blower relay is also there but the 30A fuse in the 1 slot is blown--I replaced this fuse and the fuse blew immediately--hard to tell whether it was on start up or when I turned the fan dial.

Any thoughts about what is likely to cause this sort of problem---what basis diagnostics would anyone suggest to hunt down the problem.


Thanks for your help.


Steve
 
You don't get any heat in the car? - the blower works on a cold setting , but not when you turn the heat up? The fuse that blew was in the rear fuse box? If so, it's proably the rear blower bearings that have gone south. (it's in the engine bay on the left hand side). About £200 for a new blower motor. Easy to fit yourself.

Andy
 
Hmm.. you don't get any hot or cold air flowing through? According to Adrian Streathers' book, this may indicate a failed control unit. When you turn the heat up, does the rear blower start, but no heat is getting into the cabin? This could mean it's the forward blower fans which are in front of the windscreen by the wiper mechanism.

The fuse that was blown, was it No.1 in the fuse box? It says that if this is the case, it could be te Final stage amplifier block failed or overherheated (whatever that is...!)

To be honest, I'm not sure what it could be!! Maybe someone else will be able to help!!

Andy


 
Andy

That is right there is nothing coming through--except that generated by the motion of the car---and yes it is the no. 1 fuse that blows--I am not sure what a final stage amplifier block is either.

Thanks for th input.

Steve
 
Steve,

The final stage amplifier is a bit of electronics that drives the two blower fans. The amplifier is mounted on a big chunk of aluminium which acts as a heat sink. I believe it's mounted in the area around the blower fans, underneath the central electric but I haven't been in there to give you an exact location - sorry. If the final stage has developed a fault it would certainly explain why fuse 1 would blow. The front blowers have a bit of a reputation for developing noisy bearings but I don't think they nornally seize completely.

I haven't looked at the wiring diagram in any detail but I suspect that fuse 1 blowing is likely to remove all power from the CCU so there is little chance the rear blower would run since the CCU would not be in a position to start it. The only way to confirm it is to unplug the final stage amp (which means removing the central electric), put a new fuse in and see if the rear blower will then start. If it does it would confirm the problem with the final stage amp. I have a feeling that new ones are not cheap (what is I ask myself) although I have on occasions seen secondhand ones on eBay from krimkramsshop in Germany - in fact, there is one on there at the moment - http://cgi.ebay.co.uk/PORSCHE-964-993-ENDSTUFE-LUFTUNG-VENTILATION-C-U_W0QQitemZ4584115945QQcategoryZ61539QQrdZ1QQcmdZViewItem

Hope that helps.

Regards

Dave
 
Dave

Thanks for the info--I won the CCU on ebay so now all I need to do is work out how to pay for it--Pay Pal doesn't seem to come up.

Thanks for your help on this it has been really useful--if my CCU is OK--I'll put this one back up on ebay.

Steve
 
Steve,

Assuming you mean the part from krimkramsshop you'll have the same hassle that I had. Deiter doesn't accept PayPal or credit card payments - only bank transfer or cash. I found that my bank wanted to charge me £23 to transfer €30 so it was hardly economic. I finally resorted to getting the Euro notes from the Post Office and sent it by registered post.

Hope that helps.

Regards

Dave
 
Thanks for the warning--we are just counting up our Euro's now--I have already asked krimkransshop for their bank details-so this will be a non starter--the final price of the CCU was Euro 35 plus Euro 20 shipping---this seems a reasonable deal to me--given the price of these things--I haven't started to look where it goes in the car yet but I assume it is in the luggage compartment under the fuse box somewhere.

I vbought one of these workshop manuals from workshopmanuals.co.uk for botht he 993 and the 964 and the critical pages for the 964--heating and ventilation are missing.

The colour of your car seems similar to my 993--which is patel yellow--just zymoled it today and it really shines brings out the best of the colour.

Steve

 
Dave

I replaced the CCU with the one I bought from ebay the other week--for info the CCU is located int he luggage compartment between the fuel tank and the bulkhead, one of the securing bolts is is the one that secures the central press stud for the carpet.

I now have the wonders of heating in the car----it is a rare experience and something that I only thought 993 had until this moment.

I now have one naff CCU that will probably go in the bin--unless there are any user serviceable parts.

Thanks for your help with this one.

steve
 
You can get them fixed. Somewhere in Italy I think! Have a look on the DIY section of www.porsche964.co.uk

Glad to hear you found out what the problem was!

Andy
 
ORIGINAL: Steve Humphreys

Dave

I replaced the CCU with the one I bought from ebay the other week--for info the CCU is located int he luggage compartment between the fuel tank and the bulkhead, one of the securing bolts is is the one that secures the central press stud for the carpet.

I now have the wonders of heating in the car----it is a rare experience and something that I only thought 993 had until this moment.

I now have one naff CCU that will probably go in the bin--unless there are any user serviceable parts.

Thanks for your help with this one.

steve
Click to expand...

Steve,

Don't get confused. The CCU is actually the Climate Control Unit ... which is the unit mounted in the dash alongside the radio. It's this unit which Andy is referring to which can be repaired by the company in Italy. The unit you are referring to (I think) is the final stage amplifier for the front blowers. It wouldn't surprise me if the same company could repair that too but I would wonder what sort of cost was involved. By the time you've shipped it to Italy and back as well as the repair I reckon you may be better off just binning it.

Best regards

Dave
 
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