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Old 12-03-2002, 06:35 PM   #1
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Default Heating problem

Hi,

A couple month ago, I bought a bonneville sse 92... I didn't have any trouble until now. When I'm driving for more than 45 minutes, the heat sensor alert me that I have low coolant... When I look at the temperature, I notice it'* running at 100Celsius...

When I put turn on my climate control and set the temprature to the warmest possible, 5 minute later, temperature is back to 90C and the alert disapear.

I replaced the thermostats and the sensor that start the fan... Both fix didn't do anything... Then I went to see a mechanic and he sayd there was no trouble... I'm still skeptic, I was running during the summer without any problem and it never went that high... And now that we are in winter (I'm from quebec, canada) outside temp are near -5C, which wouldn't be responsable for more heat...

So my question is, what operating temperature is normal? OR, do you have any idea what could be wrong...

Also, 2nd prblem, it happened 2 days ago, now when I try to change the destination of the air, it doesn't change, it always stay on the main window (well the acm tell me it changed, but flow didn't change)...

I suspect a kind of motor to be either unplugged or dead, anyone for information on how to check this or change this? Is it easy?

Thanks alot in advance
Eric
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Old 12-03-2002, 10:57 PM   #2
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Are you getting a "Low Coolant" indicator lamp or an indication that your engine temperature is high?

The second problem sounds like your climate control system is not getting the proper vacuum. Usually this happens when your vacuum line to the HVAC is disconnected, broken, or kinked.
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Old 12-04-2002, 12:10 AM   #3
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I'm getting a Low Cooland indicator lamp... But it only appear when temperature goes higher than 90C, as soon as it get back to normal (with the heating system on), that light goes off...

Also, for my HVAC, I found the problem, it gave me code 48, that'* the Driver Aix Mix Motor...
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Old 12-04-2002, 01:32 AM   #4
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I'm not sure why the low coolant light comes on. That is supposed to come on when your coolant level in the radiator is low. Possibly you have a faulty low coolant module in the radiator. Double check to make sure your radiator isn't low on radiator fluid.
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Old 12-04-2002, 01:40 AM   #5
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Quote:
Originally Posted by eus
I'm getting a Low Cooland indicator lamp... But it only appear when temperature goes higher than 90C, as soon as it get back to normal (with the heating system on), that light goes off...

Also, for my HVAC, I found the problem, it gave me code 48, that'* the Driver Aix Mix Motor...
See the other thread... That'* actually the code for long term freon loss. We got to get Will to fix the formatting on the climate control diagnostic again!

I still think you may have a vacuum problem. Maybe someone else can chime in.
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Old 12-04-2002, 01:43 AM   #6
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Ooops. Went on vacation and forgot about that. I'll fix it tonight.
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Old 12-04-2002, 11:11 AM   #7
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Well, if it'* a faulty sensor, why would by temperature go up as 100C, and then go back to 90 when I start the heater??

Also, about that other trouble, maybe I'm loosing freon too, like you sayd, it'* still a 92...

But any info on that vacuum trouble? Anyone can give me a few info on how to verify that?
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Old 12-04-2002, 05:36 PM   #8
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Using the heater takes heat from the engine, kind of like a mini-radiator. But I don't understand why this would have an effect on the "low coolant" light, unless there was low coolant in the radiator, or if the module was starting to go bad, and becoming heat sensitive. That'* just a guess.

I believe the black vacuum line goes from your throttle body to a box on the firewall. I'll have to verify it'* exact location. It may be broken, rotted, kinked, or disconnected. I'll post back later.
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Old 12-05-2002, 12:01 AM   #9
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The vacuum line is a tube that goes from the throttle body to the odd-shaped box (vacuum tank) on the firewall. From there the vacuum supply goes to the HVAC Programmer in the dashboard. Check the vacuum supply along the line, starting at the throttle body. Check the vacuum tank for cracks or leaks also.
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