blower motor 928s4
06-16-2017, 01:01 PM
#2
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
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First things first:
-- Welcome to the 928 group! You've landed on what we consider to be the friendliest and most comprehensive 928 resource available.
-- Be Sure To Read the New Visitors thread in the top section of the front page. Lots of hints and links to common ailments and known solutions.
Start by inspecting, and possibly removing the fan and motor to see what's causing it to draw the high current.
There's a rubber boot/sleeve between the fan and the HVAC air box, accessible under the hood. You can work that boot off or at least out of the way, and have a look towards the blower cage. You'll need to remove the plastic cowl cover at the base of the windscreen for access. If the car is not driven regularly, and particularly if it's winter 'parked" rather than "stored", the area in that housing is one of several favorite spots for rodentia. You may be able to clear stuff that's stopping or slowing the fan.
You may need to remove the blower for cleaning and service. That's easiest with the hood off, so you may need to recruit an extra pair of hands. Standard guidance on hood removal and replacement applies: put tape or other alignment marks on the hood where the hinges bolt on so you can get it back on where it is now.
The motor can be disassembled for cleaning, with bearing and brush replacement. Our regular vendors sell the bearings and brushes. If the motor has water damage, replacement may be your best option. Good used parts come from 928 International in Anaheim. There are new original plus aftermarket blower motor alternatives available too. Try Roger at 928srus for the aftermarket alternatives.
-- Power circuit for the fans routes through the fuse, relay (as you've discovered), the speed selector switch on the dash controller, a resistor bank that's mounted in the air duct downstream of the blower, then on to the motor itself. In general, you'll find that the fusing in the car is barely adequate or less to protect the wiring and the control head. Fig Newton's Third Law of Electrical Reciprocity states that expensive wiring and components, normally protected by a fuse, will undoubtedly fail and protect the fuse. Based on that, don't do testing through the factory wiring and stuff if you can possibly avoid it.
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Share some of your history with the car when you can. Pics are always appreciated. Be sure to add the year of your car to every post, so we can offer the correct guidance for what you have. Full membership adds the ability to create a signature line with that info, post pictures, buy and sell parts and stuff, and also helps reduce the ad population on your screen. Worth the small investment IMHO.
Again, welcome to the group!
-- Welcome to the 928 group! You've landed on what we consider to be the friendliest and most comprehensive 928 resource available.
-- Be Sure To Read the New Visitors thread in the top section of the front page. Lots of hints and links to common ailments and known solutions.
Start by inspecting, and possibly removing the fan and motor to see what's causing it to draw the high current.
There's a rubber boot/sleeve between the fan and the HVAC air box, accessible under the hood. You can work that boot off or at least out of the way, and have a look towards the blower cage. You'll need to remove the plastic cowl cover at the base of the windscreen for access. If the car is not driven regularly, and particularly if it's winter 'parked" rather than "stored", the area in that housing is one of several favorite spots for rodentia. You may be able to clear stuff that's stopping or slowing the fan.
You may need to remove the blower for cleaning and service. That's easiest with the hood off, so you may need to recruit an extra pair of hands. Standard guidance on hood removal and replacement applies: put tape or other alignment marks on the hood where the hinges bolt on so you can get it back on where it is now.
The motor can be disassembled for cleaning, with bearing and brush replacement. Our regular vendors sell the bearings and brushes. If the motor has water damage, replacement may be your best option. Good used parts come from 928 International in Anaheim. There are new original plus aftermarket blower motor alternatives available too. Try Roger at 928srus for the aftermarket alternatives.
-- Power circuit for the fans routes through the fuse, relay (as you've discovered), the speed selector switch on the dash controller, a resistor bank that's mounted in the air duct downstream of the blower, then on to the motor itself. In general, you'll find that the fusing in the car is barely adequate or less to protect the wiring and the control head. Fig Newton's Third Law of Electrical Reciprocity states that expensive wiring and components, normally protected by a fuse, will undoubtedly fail and protect the fuse. Based on that, don't do testing through the factory wiring and stuff if you can possibly avoid it.
-----
Share some of your history with the car when you can. Pics are always appreciated. Be sure to add the year of your car to every post, so we can offer the correct guidance for what you have. Full membership adds the ability to create a signature line with that info, post pictures, buy and sell parts and stuff, and also helps reduce the ad population on your screen. Worth the small investment IMHO.
Again, welcome to the group!
06-16-2017, 03:12 PM
#4
Rennlist Member
50/50: He will, or he won't.
06-16-2017, 10:49 PM
#5
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Question is whether he will respond to the suggestions and continue his quest, sharing more info about the car and this project. There are way more owners not on RL than on. It's sometimes hard to believe, but some owners are able to keep their cars alive without our help and support. We tend to attract a more DIY crowd is seems.
His car came with a blower?