1999 Chevy Trailblazer air conditioning blowing mist

SCOTTLANZ

MEMBER
1999 CHEVROLET TRAILBLAZER

Air Conditioning problem
1999 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic 120 K miles

My wife drove to work this morning, with the A/C blowing a mist into the cab. What is causing this?

How do we fix it?

It went away in the afternoon. But now the next day, she had a mist coming in only when she braked.

Is this a drain problem, or a mechanical problem?

5 Replies

MERLIN2021

MECHANIC
17,250 POSTS

It is most likley the drain, if it gets cold, we can rule out a leak. The water on the evap core is being blown into the registers, under the truck, at the firewall, clean out the small hole in the a/c plenum. Water should floww, can you see a puddle with a/c on?

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Tuesday, June 17th, 2008 AT 12:31 PM

SCOTTLANZ

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3 POSTS

Don't see a puddle of water.

Took it in to see a mechanic, he recommends cleaning the evaporating core and flushing the system. Hopefully this helps.

He warned me that the evaporating core might be too damaged to just clean. And that I might have to replace it.

Is this all legit?

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Wednesday, June 18th, 2008 AT 3:25 PM

MERLIN2021

MECHANIC
17,250 POSTS

If the air flow hAS become restricted it could need cleaning, but he should not damage it by cleaning it if he knows how. If air flow isn't restricted, then just clear out the drain. Water will start to flow out when it's open!

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Wednesday, June 18th, 2008 AT 4:58 PM

SCOTTLANZ

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So, the mechanic pulled the old evaporating core, it was damaged and replaced it.

But it is still blowing a mist into the cabin.

Where exactly is the drain coming from? And how do I find it? I looked for it, but couldn't see the drain.

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Saturday, June 28th, 2008 AT 10:52 AM

MERLIN2021

MECHANIC
17,250 POSTS

If the evap core was replaced, and the guy did'nt clear the drain, go back and tell him to fix it right, you may not have needed the evap core. The drain is at the bottom of the evap case at the firewall.