Heater Blows on Low! - 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 01-07-2004, 11:18 AM   #1
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Default Heater Blows on Low!

I am having a problem with my heat....it blows andit gets warm (eventually) but no matter how high i put the setting on it blows like it'* on low..same with the AC also..thanks
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Old 01-07-2004, 02:35 PM   #2
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Do you have automatic climate control? Does it sound like the heater fan is speeding up when you put it on high?
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Old 01-07-2004, 03:21 PM   #3
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No I don't have automatic and it does not sound like it turns up..like it stays on low all the time..thanks
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Old 01-07-2004, 08:23 PM   #4
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OK, you need to check and tell us the voltages at the three different fan settings.
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Old 01-07-2004, 08:54 PM   #5
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sorry fuddy..as i paid more attention this evening..the fan noise does turn up like it is blowing like crazy..but the heat is not blowing out like it sounds..it is barely comming out..but it does eventually get it warm..i checked the vacume hose under the hood and all is fine!

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Old 01-07-2004, 09:02 PM   #6
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Sounds like a clogged evap core to me. Use the procedure in Techinfo.
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Old 01-08-2004, 09:25 AM   #7
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Default blower fan

Could be something as simple as the screw on the squirl cage is loose and not turning the cage. Just an idea. To check just pull the blower motor and see. You will also be able to see if the motor is turning at faster rpm'*. Those plastic cages tend to crack at the shaft of the blower motor.
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Old 01-08-2004, 02:53 PM   #8
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Default Re: blower fan

Quote:
Originally Posted by Bdd8591
Could be something as simple as the screw on the squirl cage is loose and not turning the cage. Just an idea. To check just pull the blower motor and see. You will also be able to see if the motor is turning at faster rpm'*. Those plastic cages tend to crack at the shaft of the blower motor.
Um, I've never seen a cracked one myself, and the motor shaft is usually a D-profile so it won't slip; the retainer nut is just that, not a set screw. In any case, it'* not too horrendous to pull the blower motor for a look-see, although the first item I would pull would be the blower speed controller module (or resistor pack, depending on whether you have electronic A/C or not) from the middle of the evaporator core housing on the firewall, just below the MaxiFuse/Relay Center. (Pulling the blower motor and fan will not enable you to see the core fins; you must pull the controller module for that.)

Pulling the blower controller will allow you to see a sizeable area of the evaporator core, and what I suspect you'll find is that its fins are oily and clogged with dirt. Cleaning that will improve the airflow, per the TechInfo article.

Ideally, replacing the evaporator core is the main fix (since it probably sprang a leak, the source of the oily mess), but that requires a lot of disassembly.
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Old 01-08-2004, 02:55 PM   #9
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My goof, Andy, I thought she said it DID sound like it sped up. I agree with checking the voltages first.

My evap core, however, didn't spring a leak, but was clogged with dust/debris. I increased my airflow by about 1/3 by cleaning it. Jseabert gained about 50%.
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Old 01-08-2004, 03:55 PM   #10
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Quote:
Originally Posted by willwren
My evap core, however, didn't spring a leak, but was clogged with dust/debris. I increased my airflow by about 1/3 by cleaning it. Jseabert gained about 50%.
Good!

Somewhere around here I still have the photos from last summer'* big evaporator core replacement project. Gotta write that up sometime...

BTW, are we still unable to embed photos in TechInfo articles? Seems kind of weird that we can't, what with all the images getting plastered all over the regular postings here...
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