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Old 12-25-2012, 01:35 PM   #1
flaskmaster
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Default 99 Malibu - No Heat

I have a 99 malibu, and recently the heater just stopped blowing heat. The temp gauge stays the same, I can feel a little heat coming out of the top window defroster, barely enough to keep the window from getting frosted over.

No matter what selection I choose, I hear no motor running. I have some auto experience, but I've never touched a heater before.

My wife has kicked under the glove box a few times, or if I hit a big bump, I can hear the motor turn on a little, but it sounds choppy for a few seconds, then dies again. I read that there may be a fuse involved? I'm not sure where to start.

I look forward to your replies.
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Old 12-25-2012, 02:28 PM   #2
RalphP
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Default Re: 99 Malibu - No Heat

This may be a) the A/C head acting up, b) the heater blower resistor acting up, or c) the blower motor itself acting up.

Good news is, b) and c) are often enough, it may not be a bad idea to swap both out.

Now, are you a bit of a contortionist? What I'm about to say is not really for fat white boys (raises own hand!) or people with bad backs, but I did manage to do it with the seats in.

On the passenger side, under the dash, is a sound deadening panel. If you remove that, you can see the blower motor and the resistor pack to give you various speeds.

At that point, it's easy to make sure it's not something really silly like a bad connector - or you can turn the heat on and thump the blower motor and see if it comes back on.

Four bolts, the motor comes out - buy a new or reman'ed one with the squirrel cage on it, and it's four bolts back in, reconnect, and good to go.

The resistor is right beside the blower motor, connector and two bolts it's out, two bolts and connector and the new one's in.

Both should be available for under $100 easily.

RockAuto has several vendors for the motor with the wheel ... http://www.rockauto.com/catalog/rafr...&parttype=6916

They also have several vendors for the resistor pack ... http://www.rockauto.com/catalog/rafr...&parttype=6557

Given shipping, you should hit right at $100 for ACDelco for both. I'd not buy too cheap - that position can hurt your back while you're in there (I do it through the open door, skinny folks that can touch their nose with their toes can do it in the front seat *grins* ) and it's not something you want to do too often. After all, the AC Delco has lasted, what, 14 years?

RwP
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335K miles on original motor and tranny (only motor work 2 x LIM replacement), Monroe SensaTrac struts front and back (new at approx. 300K miles), and Alero discs in back. LS fogs added with custom wiring. HID high beams, HIR low and halogen fogs. Raybestos Pro Grade front rotors and Bendix D747 ceramic pads on front.

Addendum: Rest in peace. Surge tank blew, motor overheated, I think she's lived a long and useful life.
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Old 12-31-2012, 08:30 AM   #3
flaskmaster
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Default Re: 99 Malibu - No Heat

Well, good news. It was simply the blower motor's bearings were out. After pulling it out and setting it on its side, turning on, the motor blew like crazy. But as soon as I put it in a vertical position it would shut off. A quick 15$ part from the used parts store, and my kids and I are enjoying a nice, warm vehicle again!

Thank you all!
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Old 12-31-2012, 08:35 AM   #4
DrivenDaily
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Default Re: 99 Malibu - No Heat

Great news, and thanks for sharing the fix! Sure is nice when it's cheap and easy.

(Most guys say that about girls, too, but they really don't mean it... )
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