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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-18-2008, 02:25 AM   #1
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Default Heater Problem

At first the blower would come on intermittently, now its not turning on at all. I put a test light on the wires going to the blower there was no power. Next I swapped the ECC out for a different one and still no blower. I need some help with this one. Thanks
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Old 02-18-2008, 02:51 AM   #2
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Have you checked your fuses
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Old 02-18-2008, 12:18 PM   #3
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Default Re: Heater Problem

Quote:
Originally Posted by jberg6
At first the blower would come on intermittently, now its not turning on at all. I put a test light on the wires going to the blower there was no power. Next I swapped the ECC out for a different one and still no blower. I need some help with this one. Thanks
Do you have the automatic temperature control version of AC? If so, your problem could be your blower control module. It'* on top of the heater housing close to the blower motor in that housing. The Relay Center is above it and can be loosened with one-or two screws and moved up some.

The blower control module is held by two screws. You can check the blower motor itself with a fused wire from the battery and ground to be sure it'* working okay? Some people suggest hitting the blower itself enough to vibrate it witht he power on and sometimes they will start working, usually temporarily.





Be sure to diagnose the blower motor and check for power to the blower control module before replacing parts>[/img]
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Old 02-18-2008, 12:40 PM   #4
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Default Re: Heater Problem

Quote:
Originally Posted by jberg6
At first the blower would come on intermittently, now its not turning on at all. I put a test light on the wires going to the blower there was no power. Next I swapped the ECC out for a different one and still no blower. I need some help with this one. Thanks
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Old 02-18-2008, 01:31 PM   #5
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I looked in the book for a fuse for the blower and didn't find one. I'll check the blower control module next.Thats gotta be it. thanks guys
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Old 02-18-2008, 04:05 PM   #6
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Quote:
Originally Posted by jberg6
I looked in the book for a fuse for the blower and didn't find one. I'll check the blower control module next.Thats gotta be it. thanks guys
Did you check the motor itself with a fused power lead from the battery positive?
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Old 02-18-2008, 10:32 PM   #7
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Is this the automatic climate control, with push buttons and the LED display, etc.?
Or is this a manual control with *****?
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Old 02-19-2008, 12:49 AM   #8
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push button ECC
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Old 02-19-2008, 11:51 AM   #9
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If it is also dead on highest speed it is likely something other than the Control Module, which is used to slow the motor from high speed. It should get bypassed in HIGH.

The ground for the motor (and the blower control mod.) is via the passenger front fender above the battery. Take that loose and clean the ends of all the black wires.

If your ECC is the same as my 93, the other common item is the dashboard HVAC control panel (yuk).

My schematic also shows fuse 17 (25 amp) as being a common requirement for all blower speeds. This is in the fuse block under the dash near the steering column.

If it runs on some speeds but not others, it will point towards something else. So knowing that is important.
Again, all I have is manual for a 93, so just crossing my fingers that the items above are common to your year.
Bill
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Old 02-19-2008, 02:06 PM   #10
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Quote:
Originally Posted by jberg6
push button ECC
If you have the auto temp control system with a digital readout, then you have a power feed to the blower control module that goes through fuse A3 in the Relay Center, a 30A. fuse.

It also has two other related fuses that go to the programmer which feeds the voltage to the lblower control module: Fuse 5A for 15 Amperes whic is labeled also as Aut A/C Cruise; and Fuse 9C which 10 Amperes and labeled MSC/RDO/CLSTR. The last one is keep alive, I believe.

There is no separate relay that powers the high speed setting with direct current from the battery instead of through a resistor pack as is on the basic HVAC unit.

Have you tested the blower motor itself? Always start with the simplest explanation. Law of Parsimony.

EDIT: I missed a fuse. There'* a fuse in the right side passenger fuse/relay block. It'* #11 and is 10 amperes. It'* the feedback fuse from the line to the blower motor that tells the programmer what voltage is b eing applied to the motor by the blower motor control module.
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