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Re: 2002 Impala no low speed cooling fans
From my memory, W-cars (as is yours) wait until a/c pressure hits 175psi to turn on low speed fan(s). So just having a/c on is not a test for low speed fan operation- it has to be in hot ambient as well.
Again, the Tech II is the best tool to test with- it will show a/c pressure and fan status- and you can command all fan speeds as well.
Most all other GM cars - the fans come on with a/c request, just not W-cars.
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Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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