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Join Date: May 2002
Location: Massachusetts
Posts: 480
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Can I repair my heater blower relay?
My heater blower relay has failed. Is it crazy to consider opening this tightly sealed relay to test and possibly repair? This would be a new one for me. This is the 611.618.153.00 relay. The $100-300 replacement cost makes a repair interesting.
Thanks, CL
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CWL '86 Carrera Coupe '88 Carrera Cab '02 525i Sedan |
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06-13-2011, 01:07 PM
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Chris,
This is what you are going to find inside the relay. If you are comfortable with electronics troubleshooting & repair have at it  This image indicates the jumper by-pass that eliminates the FW blowers reed switch from the circuit. The engine blower should still work with this by-pass. However since you have determine that your relay will not operate the engine blower, it would indicate that there might be a problem with the engine blower relay (there are separate relays for the engine blower & FW fans in the control unit.) If that is the case the jumper will not work as it needs the power from the engine blower relay to operate the FW blower relay...  Did you get my PM? Good luck, Andrew
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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06-13-2011, 01:22 PM
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Join Date: Aug 2008
Location: sectors R&N, SE Pa
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Is this really the 911.618.153.00 unit?
sorry to butt in, but is it drawn as 2 items on the Bentley schematic (as a control unit and a relay)? my guess is if the surface mounted parts or the winding in the Lrg coil are toast, it'll be a challenge, but if one of the transistors went, you'll be in luck. trick may be in getting a schematic.
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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06-13-2011, 01:38 PM
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Dan
The Bentley diagram is for an "Autoheat" system. Chris' car is manual heat and would only have this "blower control unit" (not the "heater control unit"). Both systems use this 911.618.153.00 contol unit.
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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06-14-2011, 03:57 AM
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Location: Massachusetts
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Andrew and Dan, I do have manual heat. This a picture of the inside of my relay. I thought I saw the problem with the contact plate being slight misaligned (see arrow on picture) but no. I will compare Andrew's photo with my relay to see if anything seems odd. If not, I may have a component failure.
Thanks both. Chris Andrew, I will check your PM in a minute. I have not seen it. 
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CWL '86 Carrera Coupe '88 Carrera Cab '02 525i Sedan |
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06-14-2011, 06:37 PM
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Join Date: Jan 2009
Location: Marietta, Ga (Atlanta)
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Chris,
If you need a 911.618.153.00 25Amp relay, I've got a used one for you for $75 shipped. Grant
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'80SC Widebody 3.6 transplant Anthracite "The Rocket" Long gone but still miss them all: '77 911 Targa, '72 BMW 3.0CS Coupe(finest car I ever had!) '71 911T Coupe White, '70 911T Coupe Blue '68 911 Coupe Orange, '68 911L Soft Window Targa |
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06-15-2011, 11:54 AM
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Registered User
Join Date: Nov 2011
Posts: 3
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Schematic for Heater Relay
Is there a schematic available for the 911.618.153.00 relay? I want to find out why mine failed....thanks
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11-26-2011, 09:20 AM
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1988 Porsche Carrera Cabriolet 3.2
