GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

1

Check the filter-drier.

Is the filter-drier saturated?

--

Go to Step 2

Go to Step 3

2

Remove and replace the filter-drier. Follow the manufacturer's instructions.

Is the replacement complete?

--

System OK

--

3

Check the moisture indicator.

Is the moisture indicator faulty?

--

Go to Step 4

System OK

4

Remove and replace the moisture indicator.

Is the replacement complete?

--

System OK

--