Volvo RWD 700 Forum

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heating and air conditioning 700 86

posted by  someone claiming to be Rafael Riverol on  Wed May 23 17:11 CST 2001 [RELATED]

With A/C on, I cannot get heater valve to close with vacuum. That is until I turn off the engine. Then the vacuum connection closes the heater valve completely for a few minutes. After these few minutes, vacuum is lost and the valve opens again. Please, can anybody tell me what is going on. I have read several times the heating and air conditioning section of FAQ for 700 and 900 cars, but I do not have a handle on the problem. Thank you.







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Re: heating and air conditioning 700 86

posted by  someone claiming to be John Alvarez on  Thu May 24 15:13 CST 2001 [RELATED]

Had same problem, but on a '88 240. It was a defective vaccuum chech valve that connects to the intake manifold. Its black on one side and white on the other side, easy and inexpensive to replace. Hope this helps







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Re: heating and air conditioning 700 86

posted by  someone claiming to be David Hunter on  Wed May 23 17:26 CST 2001 [RELATED]

Had similar problems with this valve on my 88 740. Vacume line was creased and partially restricted down near the gas pedal causing incorrect operation of the valve.






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