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2000 ELDORADO ETC
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The climate control does not work on heater, ac compressor works on ac, compressor will not come on for heater. rear window de-icer inop, fan works on ac but not heater
 

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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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19,273 Posts
The climate control does not work on heater, ac compressor works on ac, compressor will not come on for heater. rear window de-icer inop, fan works on ac but not heater
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that is somewhat confusing to read - let's break it down -

The climate control does not work on heater,
are you saying if you turn the temp up -
you don't get ANY hot air from the defroster vents or floor vents?

ac compressor works on ac,
compressor will not come on for heater
.
are you saying when in the AUTO mode -
and you select a higher temperature -
the compressor does not engage?

rear window de-icer inop,
this is the electric grid built into the rear window -
and has nothing to do with the Climate Control system -
check the fuse -
not uncommon for the grid wire to be scratched/cut -

fan works on ac but not heater
does the fan actually stop turning -
something you actually hear?
or does the air just stop coming out of the dash vents?

keep in mind that you have almost no control of WHERE the air blows from -
except DEFROST -

ambient and cold air emit from the center - "dash" - vents -
and defroster vents if selected -

heated air only comes from the floor vents -
and defroster vents - if selected -

you can not get heated air through the dash vents -
or cold air from the floor vents -
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,785 Posts
Where are you located and what is the ambient temperature?

The compressor does not engage when in the heat mode and the ambient is below about 35F.
 
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