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Re: 2007 Impala LT climate control panel replacement?
Control head failures are rare.....Hardly ever. You can test compressor without control head installed. Simply jump a/c relay socket pins where relay plugs in. Jumper the two big terminal pin plugs- not the smaller ones. Or measure the voltage to ground (with DVM) at each pin plug and find the one big with 12v constant, and jumper it to the one big without 12v constant. Does a/c compressor click on? Ignition need not be on. Do not fiddle with the little pin plugs, they are the relay coil control circuit.
You can also measure resistance to ground from compressor feed at same pin you just jumpered. Should be near 3.5 ohm . if compressor coil is good.
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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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