Join Date: Aug 2011
Location: Bay Area, California
(I let the car sit for longer than I care to admit.... So naturally I'm working my way through some issues)
Have an issue, I'm still reading up on stuff here but I figured i'd ask about something I'm still unclear on.
I've read and witnessed that the primary fan comes on when there is a high temp or when I turn on the A/C. My question is when I have the A/C switch on>> what actually tells the fan to turn on? The switch? the clutch kicking in?
I have/had two codes: P1641 and P1642 (relays)> Now before I get told to replace the relays, when i unplug the sensor on the water pump both fans do indeed turn on. So it cant be the relays right?? (I have replaced the relays and fuses anyway HOWEVER both fans turned on when I pulled the connector before i replaced the relays)
Since both fans turned on can I assume there isn't a connection issue, relay issue, melted wires on the fuse/relay block, etc (as other posts I have searched have suggested)? When I let the car heat up the primary fan did ultimately kick on. So I really don't understand the CEL codes I got.
The only remaining outstanding issue is the primary fan does not turn on when I have the HVAC switch in the A/C position. The car does not blow cold. I'm assuming the compressor is bad (I will jumper the switch in the A.M.) Does the compressor have to "work" to kick on the primary fan? Does it need to see some type of pressure? Does a bad/failed compressor cause the same CEL's? There is no clicking in the clutch or on/off cycles like when I was blowing hot air previously.
I think its obvious I have some type of A/C issue. Going to take it to a shop. Just frustrated at the codes I'm getting saying bad relays when I can pull the plug on the water pump and kick the fans on. If i had bad relays, I would assume they would not kick on.
(I'm going to change the motors on the fans themselves anyway because they are pretty loud and squealing. I dont think loud or stressed motors that actually work would cause the CEL codes right?)
Any help would be appreciated.
ISSCA Member #2482
1996 Impala BBB: SLP Headers. K&N FIPK, Eibach Pro Kit, ZQ8s. Bilsteins. Gary's Opti, Battery, and Headlight Harness'. Vette Starter. Taylor ThunderVolts. NGKs. Stealth & Metering Bolt. Goodridge Brake lines. TB Bypass. Magnaflow CATs. Air delete. Alex Tune. DynoMax 959's. CrownVic MMC drive shaft. BMR Ext'd RCA's. 373's/Superbrute
GOALS: Road Race Trans/TC, LE1 or AI Heads and CAM.