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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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How to disable V90 air conditioning in winter?Views : 1771 Replies : 36Users Viewing This Thread : |
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Dec 5th, 2018, 20:08 | #31 | |
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As i've completely removed the vicious fan from my 760, i rely purely on the electric one that some previous owner has wired into the thermoswitch on the rad. Somewhere i have an alloy adaptor and (if memory serves) a Vauxhall Omega two-stage switch that switches at 92C and 104C so the 92C will bring a (yet to be fitted) primary fan on and if it ever gets hot enough or the A/C is running, the second (factory) electric fan will come on - project for another day though!
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Dec 5th, 2018, 20:16 | #32 |
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Dec 5th, 2018, 20:18 | #33 |
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yes , The Engine ECU actually controls the AC . The command comes in to it from the climate unit to request cooling , if conditions are right the engine ECU will activate the AC clutch , ambient and engine temperature and engine RPM , AC Pressure are a few of the factors which enable the request to be allowed to pull the clutch in . So if the AC does not turn on when you press the button there are a lot of checks needed to find out why .
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Dec 6th, 2018, 12:21 | #34 | |
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Ecu
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On MCC systems and ECC systems of the last series B230FK/FT the electric diagrams show no feedback from the ECU to the MCC/ECC panel, so at least for these models the ECU cannot actively influence the AC. Btw, on an MCC system it is sometimes necessary to resolder the auxiliary relay on the printed circuit board. |
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Dec 6th, 2018, 15:08 | #35 | |
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Dec 6th, 2018, 15:17 | #36 |
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it's a long time since I investigated a 900 they never had AC problems ! However what I said does apply to the new generation cars starting with the 850 in 1992 .
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Dec 6th, 2018, 19:03 | #37 |
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Well done Jim, that's impressive! Just goes to show what you can get out of a well looked after D24, contrary to the mutterings of others on here......
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