Porsche Parts Catalog Porsche Accessories Catalog Porsche Technical Articles Porsche Tech Forums
 
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Heater Blower Motor Replacement
 
Bookmark and Share

Pelican Technical Article:

Heater Blower Motor Replacement

David Greene

Time:

1-2 hours

Tab:

$130 to $160

Talent:

*

Tools:

7,10, 13mm sockets or wrench, flat screwdrivers large and small, 4mm hex-head allen wrench, steel brush (additional tools if necessary: flat file, small adjustable wrench, green pad/steel wool, semi-gloss trim paint.)

Applicable Models:

Porsche 911 (1974)
Porsche 911 Carrera (1974-89)
Porsche 911S (1974-77)
Porsche 911SC (1978-83)
Porsche 930 Turbo (1976-77, 1986-89)
Porsche 964 Carrera 4 (1989)

Parts Required:

Replacement blower motor

Hot Tip:

You can fix your worn out motor for half the price of a complete Heater Blower Motor and not have to discard your existing motor housing

Performance Gain:

Less noise and heater works

Complementary Modification:

Clean up/paint the motor housing; also you can check your vacuum line fitting that is behind the blower motor assembly and fuel lines.

The heater is an overlooked part of the Carrera until it breaks and then it leaves you cold and, in the case of the blower motor, can be very noisy. If you hear a loud squeal when you turn the ignition before the engine starts it probably is a worn out blower motor. The replacement procedure is a fairly simple thing to do, but is much easier when you have a few tips.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The heater blower motor is located on the upper left side of the engine, below the rear hood hinge (blue arrow).
Figure 1

The heater blower motor is located on the upper left side of the engine, below the rear hood hinge (blue arrow).

Start by removing the connections for the motor inflow and outflow tubes to access the motor assembly
Figure 2

Start by removing the connections for the motor inflow and outflow tubes to access the motor assembly

Be very careful with the outflow tube connection which has hex head blots and can be difficult to reach.
Figure 3

Be very careful with the outflow tube connection which has hex head blots and can be difficult to reach. With the motor accessible, remove the 10mm nuts that connect it to the intake manifold on the right side of the motor housing (blue arrow).

Next remove the third fastener on the left side behind the housing (don't drop the nut).
Figure 4

Next remove the third fastener on the left side behind the housing (don't drop the nut). The left side fastener also holds the vacuum line. Finally disconnect the electrical plug on the left side of the motor housing (black three prong plug).

Be careful not to drop the bolts.
Figure 5

Be careful not to drop the bolts.

Lift out the entire housing and find a good place to dismantle the motor from the housing.
Figure 6

Lift out the entire housing and find a good place to dismantle the motor from the housing. The motor is connected with three screws and requires a 7mm wrench.

When free carefully separate the motor from the housing being careful to slide the motor fan free.
Figure 7

When free carefully separate the motor from the housing being careful to slide the motor fan free.  Examine the motor and fan to see if there is any damage. In my case the motor housing was badly worn allowing the fan to slide into the fan housing causing the squeal (glad that's over).

The fan is secured with a 13mm nut so apply some penetrating oil .
Figure 8

The fan is secured with a 13mm nut so apply some penetrating oil ...wait 10 minutes.  Now using a 13mm socket and holding the fan carefully loosen the nut and remove the fan. If the fan spins on the motor shaft you will have another problem. The nut won't come off. You can cut it off or an easier way is to use a file to make two flat sides on the motor shaft to allow a small adjustable wrench to grab the motor shaft. Now remove the fan, being careful not to lose any washers or circlips that are attached to the motor shaft. These clips prevent the fan from moving on the shaft and must be reinstalled on the new shaft if it doesn't have them.

Also remove the mounting plate and clamp that attaches the motor to the intake manifold.
Figure 9

Also remove the mounting plate and clamp that attaches the motor to the intake manifold.

Now is a good time to check the vacuum line boot to see if it is rotted and leaking.
Figure 10

Now is a good time to check the vacuum line boot to see if it is rotted and leaking. Replace if needed.

Reassembly is reverse of disassembly or you can put the mounting plate (flat plate with curved center and three holes on first and attach the motor assembly using the round clamping bracket.
Figure 11

Reassembly is reverse of disassembly or you can put the mounting plate (flat plate with curved center and three holes on first and attach the motor assembly using the round clamping bracket.

Attach the motor assembly using the round clamping bracket.
Figure 12

Attach the motor assembly using the round clamping bracket.

Bookmark and Share
Comments and Suggestions:
Steve Comments: 86 carrera, either foot blowers won't turn on.could it be the switch or the $440 relay switch found in the engine room.fuses are OK.
Thanks
May 12, 2016
  Followup from the Pelican Staff: You will have to test the relay and switch, only way to know. When you turn it on, is there power and ground to blower? - Nick at Pelican Parts  
Greg Comments: Hi,

'87 carrera: heater blower is non-functional. How do I check if its a short, bad wiring, console switch or heater mechanical failure.

Thanks, Greg
April 22, 2016
  Followup from the Pelican Staff: Unplug the blower. Connect a DVOm across the blower terminals, does it have power and ground? - Nick at Pelican Parts  

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Wed 12/7/2016 03:01:08 AM