Another Bonny with an attitude! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 10-19-2004, 07:04 PM   #11
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The voltage sounds good, are you reading the voltage before or after the BCM?
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Old 10-19-2004, 07:14 PM   #12
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Interesting. When I was changing my air mix door actuator, I noticed a large crack in the climate housing (inside the car behind the dash). Some air was being lost through the crack but still plenty coming out the vents. There is also a large door that opens to let the air from the fan into the cabin area that is vacuum operated.

If you get bored, the door can be seen if you remove the blower motor assembly. I dont know if you can crawl under the dash and look upward to visually inspect the vacuum lines. The diaphragm is located behind the dash, on the firewall about the height of your oil, temp and boost gauges.
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Old 10-19-2004, 11:32 PM   #13
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Default Re: Blower

Randman, you are really providing some VERY interesting information in this thread! Thanks!
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Old 10-20-2004, 08:40 AM   #14
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Those readings are coming right from the blower plug harness. I did find that door behind the blower motor, I thought that was what wasn't letting air in from the blower motor...I pried it open. So I am pretty sure its open. hehe. What about the vents near the wiper arms? Dos that assist in letting air into the cabin?
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Old 10-20-2004, 08:51 AM   #15
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Primarily they serve as water drainage coming off the windshield. It might also be the intake for the blower motor but I'm not sure.

When you say "Pryed it open" are you saying that it took some effort to open? They are spring loaded but open with vacuum so it should only take a small amount of pushing to open. If it was difficult, you may have found your problem.

I'm gonna hit the parts car today. It is pretty well disassembled so you can get an inside look at what'* going on behind the dash.
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Old 10-20-2004, 03:40 PM   #16
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OK. Here you go with a couple of pics. The first one shows the door you saw while looking into the blower motor housing. The diaphragm is located directly above the gas pedal. The throttle cable and pedal mount can also be seen in the pic:

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This door swings upward to let air in from the blower. Almost like a motorcycle helmet shield lifts up.

The next one is if the vents under the wiper arms. The raised rectangle is the intake for the blower motor. The rest of that area drains water coming off the windshield:

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Old 10-20-2004, 06:38 PM   #17
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Maybe it is just me. But I have to run the fan on high...and it just gets warm in the cabin. I did the door in the picture above though. That didnt make any difference. Is there a temperature sensor someplace in the car for the inside temperature? I do know that in order to have heat out the front vents the temperature has to be around 70 - 78 degrees, and that'* after the car has ran 45 minutes or so. And it only stays there for a little bit before it drops back to the floor. On our '02 bonneville, after 1/2 you have to turn the fan down. This has me stumped.
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Old 11-06-2004, 11:00 AM   #18
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Finally!

I have found the culprit to my heating problem. A plugged evaporator not allowing the air from the fan to pass through the heater core. This is caused aparently by leakage of oil from the evaporator. You add some dust and a little dirt...and there you have your blockage. Removing the blower motor and using some compressed air cleaned her right up. Now the fan doesnt have to run on high all the time.

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Old 11-06-2004, 11:30 AM   #19
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there'* acutally a tech info for this problem....sorry we didn't get that to you. it probably wasn't oil...mine plugged up just from the condensation created from the cold coils of the evaporator, which then trapped the dust.

http://www.bonnevilleclub.com/techinfo/?article=62

edit...there is also a technical service bullitin from gm that deals with low airflow from the passenger vents
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Old 11-08-2004, 12:52 AM   #20
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Default What about the */C rattle?

The #5 on your list, how is that fixed? I have this issue on a 1995 SSEi. It still spools up nice but sounds pretty bad like maybe the */C timing is off.
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