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CCU getting unresponsive.... I want to bypass part of it! 700 1988

posted by  someone claiming to be Joe S. on  Wed Aug 24 08:13 CST 2005 [RELATED]

Glenn,

Where is the air coming out when it does this? The system is designed to fail-safe to defrost if a loss of vacuum occurs. The most common explanation for your symptoms is a pair of faulty one-way valves in the vacuum supply hoses to the climate control. They are black and white and are right on top of the engine (large vacuum lines run to them). If you have never replaced these, definitely try it first. I had to replace mine two or three times in the 9 years I have had my 760 ('88 turbo, as you have; best car I have ever owned). These will cause the mysterious mode changes on uphill acceleration, as well as any other times (the climate control will have a mind of it's own). You could have broken solder joints, as I had to resolder mine when I bought the car in 1996. However, I would replace these first and go from there. Let me know if you need anything else...

Joe S. - Volvo Master Technician

1988 760 Turbo w/280k miles, 1981 242 Turbo w/243k miles





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