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Premium Member
1997 ETC
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4,929 Posts
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When the temp on the ac control hits 89f, the blower motors turns on automatically and blows hot air for a few seconds or so, i only experience this issue during spring/summer.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,254 Posts
When the temp on the ac control hits 89f, the blower motors turns on automatically and blows hot air for a few seconds or so, i only experience this issue during spring/summer.
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that is correct - it's called air conditioning purge -

looks like SOMEONE didn't read the Owners Manual -

specifically the second paragraph on page 3-4 -
copied below -

If your vehicle is sitting out on a hot day
and you have it set on AUTO,
the air will first flow out the floor air outlets for a few seconds.
That is normal. This is to expel hot air from the air outlets.
As the air is cooled, the airflow will move through the air conditioning outlets.
If you start your vehicle with the fan setting on HI,
it will skip the air conditioning purge.
 
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