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Re: AC pressure sensor Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 20 May 2008 06:50:11 In Reply to: AC pressure sensor, TML [Profile/Gallery] , Mon, 19 May 2008 20:32:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
At the accumulator there is a switch that has four wires and a short run to a four pin connector. That switch has three sets of contacts. Two contacts are in series - one is low pressure, one is high pressure. If either switch opens (too low an AC pressure, too high AC pressure), the connection is open, and the AC compressor is shut off. Different schematics have different wire colors, but in general, that AC signal wires are colored with a white stripe.
The other switch closes at high AC pressure, and turns on the radiator fan. The assumption is that high AC pressure indicates the AC is working hard. Those two wires are solid colors.
For the AC to work, the two white striped wires must be connected together. That can be internal to the switch, or someone could have wired them together outside of the switch. That would damage the compressor if the pressure was low.
If the wire for the radiator fan is cut, all that would happen is that the Radiator fan wouldn't turn on if the AC pressure is high. The radiator fan would otherwise work normally (turn on when the coolant is hot).
So - how many pins in the connector? What wires are jumpered, if any at all? I'd expect that the AC pressure switch wires must be jumpered somewhere, otherwise the compressor won't run.
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