What causes the car to leak into passenger side floorboard? (part 2)
2009 Buick Lucerne

What causes the car to leak into passenger side floorboard? (part 2)

(2009 Buick Lucerne)
This an update and a new question to continue my previous question.

Yesterday, the leak was still happening. But a new symptom started. The A/C seemed to waiver, one minute it was blowing cold like normal, the next minute it would blow slightly warmer. It wasn't blowing warm air, but I could tell the air wasn't as cold as it should be. I took it to the dealer again. They said it had to be the drainage line causing all of this. So they flushed the line. On our way home, we blast the A/C and it's still leaking when the A/C is turned up to the 3rd setting and above. Below that it doesnt leak. So we now know it's not a clogged line. After they flushed the line, the A/C wasn't acting as wierd, but it was still wavering a bit. So we checked the cabin filter, it was dirty. We cleaned it, and now the A/C is working great. The heat also works great. What could be causing it to leak?
What seems to make the problem better or worse? The leak only happens when A/C is turned up high
How long have you had this problem? A few days (since I bought the car on September 9th)
Tags: buick, lucerne
1 answer & 1 comment
Popular Answer
on September 19, 2019

The drain tube is EITHER clogged again OR the HVAC case is cracked ... Period!

Recommend blower assembly removal for inspection - possibly foreign debris inside HVAC housing causing repetitive drain blockage..

As I recall on your other question it was mentioned to check for water steadily dropping onto ground with a/c on - that will help determine if drain is clogged again.

Good luck!
Sign in to reply
on September 19, 2019

ADDITIONALLY > IF enough water collects inside heater (HVAC) housing - it can cause ‘ALL’ of your posted symptoms !
General Diagnosis
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on September 19, 2019

The drain tube is EITHER clogged again OR the HVAC case is cracked ... Period!

Recommend blower assembly removal for inspection - possibly foreign debris inside HVAC housing causing repetitive drain blockage..

As I recall on your other question it was mentioned to check for water steadily dropping onto ground with a/c on - that will help determine if drain is clogged again.

Good luck!
Sign in to reply
on September 19, 2019

ADDITIONALLY > IF enough water collects inside heater (HVAC) housing - it can cause ‘ALL’ of your posted symptoms !

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