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Old 05-31-2011, 03:17 PM   #1
snappy
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Default 2003 Malibu heater temp on full?!?!

a few days ago my heat decides to stay on the highest temperature, just in time for summer. Even when I turn the temperature dial all the way to cold, AND turn on the A/C, it still blows HOT air. I can turn off the blower fan, but driving on the highway still forces hot air into the car. Anyone have any thoughts about this?

Thanks!
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Old 05-31-2011, 07:48 PM   #2
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Default Re: 2003 Malibu heater temp on full?!?!

You've posted in the Gen5&6 area. What year and model do you have? What engine? Do you have Automatic Climate Control?
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Old 06-01-2011, 08:03 AM   #3
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Default Re: 2003 Malibu heater temp on full?!?!

oh sorry my bad

I have a 2003 v6 model. It does not have auto climate control, just the dials for blower, temp, and zone
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Old 06-24-2011, 03:07 PM   #4
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Default Re: 2003 Malibu heater temp on full?!?!

I have the same problem as well with my 2003 V6.

To further make it interesting. I replaced the entire switch cluster for the climate options today and the problem did not fix itself.

Something I noticed, that may need some digging on my part, or someone else's experience, is that the heat control is actually driven through some form of vacuum hose/air hose. It is not resistor based at all. I may try to trace the lines to see what's going on but I'm not sure how far under the dash they go.

Further compounding things, even with a new switch I am unable to use fan settings 1,2,3 only 4,5 work without issue.
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Old 06-24-2011, 03:32 PM   #5
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Default Re: 2003 Malibu heater temp on full?!?!

Quote:
Originally Posted by defakto` View Post
I may try to trace the lines to see what's going on but I'm not sure how far under the dash they go.

Further compounding things, even with a new switch I am unable to use fan settings 1,2,3 only 4,5 work without issue.
They go all the way to a vacume operated little "motor" that moves a damper to select heated or cooled air. It is likely that the motor has failed or the damper is jammed. It is possible that the hose has pulled loose.......but I think the motor is inside the air ducts and is hard to get to; very hard.
There is another owner on here who is going through something similar.
Last post, I think he was still contemplating his next move.

If you got a new fan speed selector switch with the new panel, then either the motor is bad or some wires are broken........which is a different problem.

Replacing parts on a guess often turns out to be expensive and time consuming and frustrating. Good luck.
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Old 06-24-2011, 04:16 PM   #6
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Default Re: 2003 Malibu heater temp on full?!?!

Just found a potential solution to the fan speed. There is a blower resistor pack, which, while not easy to replace, is user replaceable, and has a tendency to go bad on these cars for some reason. Pain to get to though.

I'm about 1/4 the way into ripping the dash apart to track the air lines from the switch. I doubt I'll get to it this weekend but the new cluster at least lets me turn on the recirculate so I don't get pure hot air as I drive down the road.

I can't afford to go have a dealer or someone fix either issue. So I will get a solution for it. Just give me time.
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Old 06-24-2011, 06:20 PM   #7
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Default Re: 2003 Malibu heater temp on full?!?!

Quote:
Originally Posted by MalibuKen View Post
If you got a new fan speed selector switch with the new panel, then either the motor is bad or some wires are broken........which is a different problem.
You may mean this by "some wires are broken" - but these cars are known to burn out portions of the blower speed control resistor (right beside the motor).

Since there's only two wires to the motor, it's safe that IT works (might not be 100%, but not worth worrying about until we fix the proximate problem).

I'd swap the blower speed control resistor (little film pack, bolts in right beside the blower motor so the blower motor can help keep it cool) before I worried about much else with 1-2-3 dead, 4-5 working.

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Old 06-24-2011, 07:22 PM   #8
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Default Re: 2003 Malibu heater temp on full?!?!

Quote:
Originally Posted by RalphP View Post
You may mean this by "some wires are broken" -
Good catch. Forgot to mention that.
It could be the wires going to the pack.......but much more likely it IS the pack itself.

Seems like I remember having a fan where the bearings got tight.......and wouldn't turn until the voltage was on one of the high settings. I think that was on a 30+ year old car though.
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Old 06-24-2011, 07:26 PM   #9
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Default Re: 2003 Malibu heater temp on full?!?!

Quote:
Originally Posted by defakto` View Post
I'm about 1/4 the way into ripping the dash apart

I can't afford to go have a dealer or someone fix either issue. So I will get a solution for it. Just give me time.
It sounds like you are being deliberate and careful but tearing into the dash on a modern vehicle can be a costly and sometimes dangerous undertaking if you make just one tiny mistake and set off an air bag, for instance.

Good luck with your project; keep us posted.
Others may find your experiences educational.
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Old 06-28-2011, 09:08 PM   #10
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Default Re: 2003 Malibu heater temp on full?!?!

I have read that this issue is caused by the air blend door motor failing OR the temp controller on the instrument pack failing. I guess the actuator motor is in behind the glove box and the entire dash doesn't need to be removed to get at this. I am going to buy a new control pack and actuator motor.

I took apart the instrument pack and all vacuum hoses seemed to be working properly. There are a few on the dial for each ZONE and then two other hoses for interior and exterior air flow..... apparently the HOT/COLD air is controlled solely by the dial and air blend door motor. If anyone knows for sure otherwise, I appreciate any and all insight!

tks,
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