Hi guys, nearly there now. Looking at Wrenchtech's posting and that made me think a bit deeper.
I MM my friends car that can't be started (ignition only) but that should not matter as the temp is HOT in there, and sure enough, he gets an earth on the white wire earth that pulls in the A/C relay
On mine -
When I apply an earth to the white wire the A/C turns on. Fine.
So the problem is either in the "thermoswitch" or could it be the temp sensor itself?
What part exactly is faulty here? I cannot find any circuit diagrams of inside to help. I was thinking of testing between the connector/switch/diode/transitor and the evaporator unit, they have a foot or so long cable with 2 wires inside. I take it this is a simple temp sender unit that varies the resistance output to the comparitor as shown in Wrenchtech's schematic as above?
The reason why I am wanting to isolate the fault is because they are a bit "odd" over here, I could probably get one cut and sent to me, but if it includes the evaporator unit and the sensor then "bigbox"="big money"
So guys, what resistance reading should be on the evaporator unit's temp sensor? I can cut the twin cable output and measure it.
See the attached picture please, excuse the blurry one, that's the culprit, you guys probably seen it heaps. Then see the twincore cable going to the evap box.
Perhaps I should just pull it all apart, it's most likely never been cleaned. No such thing as preventative maintenance over here. Just so damn hot. Ok for drinking cold beer under a tree at the beach but not for working. One guy I know here wants to put A/C in his shed, lol.
Have a great day and thanks for your expertise.
Erik (From Australia)
Images (click to enlarge)
Thursday, January 26th, 2012 AT 6:49 AM