Next step is to check the clutch cycle off times. You need to check the ambient temperature in the engine compartment and then count the number of seconds between the A/C compressor clutch turning off and back on.
The clutch should remain on at the following temperatures for the following number of seconds:
60 degrees F - 20 to 50 sec.
70 degrees F - 30 to 65 seconds
80 degrees F - 45 to 120 sec.
90+ degrees F - 95 - continuously on
If the times are within spec, then the evaporator core is likely restricted. If the times are off continue to the off time test.
When the AC clutch cycles off, it should remain off for the amount of seconds specified for at the temp. Indicated.
60 degrees F - 17 to 24 sec.
70 degrees F - 14 to 23 seconds
80 degrees F - 2 to 17 sec.
90+ degrees F - 2 to 3 sec.
If the times exceed these marks, have the system vacuumed and recharged, as there is moisture in it.
Try these and get back to me.
Wednesday, June 22nd, 2011 AT 2:55 PM