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Old 01-29-2005, 10:01 AM   #1
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Default Sub Zero start HVAC POW in Duct?

Lately its been subzero out.
When I start my SSE after about 10 seconds I get a loud BANG out of something
in the heater duct.
It only does this when extremely cold out and if I put the climate control on right away it doesn't do it.
Is there a vacume device that is suppose to hold vacume when the car is off?
Is my heater damper door sticking only when cold?
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Old 01-29-2005, 10:07 AM   #2
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There are vacuum devices but they return to a "off" position once the engine vacuum disipates. Nothing that is supposed to hold while off.

My theory is the same as yours: a sticking door. Maybe there'* even some moisture on the rubber surround and it'* a little frozen.
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Old 01-29-2005, 01:02 PM   #3
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Had the same thing happen on our car in Florida. The defrost diverter sero gets out of ajustment and closes the door so far that it wedges in the duct. I was able to reach up iand bend the actuator rod (this one starts above the gas pedal and goes up at about a 45 degree angle) so that it did not close quite so far. No more pop.
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Old 01-30-2005, 11:07 AM   #4
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Default pop bang

Thas exactly where the pop comes from.
It sound like someone is shooting a gun at you. Will wake you up in the morning!
How much did you bend it Padgett?
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Old 01-30-2005, 02:01 PM   #5
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Don't really remember, it was several years ago. Is just a niggle at the back of my mind that there was an adjustment and did not need to bend but am just not sure. Can say it has not popped since.
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Old 01-31-2005, 12:37 PM   #6
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Default pop

so if theres an adjustment I'll just make it a liitle shorter and see what happens.
Thx
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