BYPASS VALVE is either connected backwards or faulty - Saab 9-5 Bulletin Board - Saabnet.com
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BYPASS VALVE is either connected backwards or faulty
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Posted by pme [Email] (#1496) [Profile/Gallery] (more from pme) on Sun, 12 Mar 2023 13:04:13 Share Post by Email
In Reply to: Re: AC code 08 and no heat, wrctkc [Profile/Gallery] , Sun, 12 Mar 2023 12:46:38
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When the temp is on LO the bypass valve closes so the coolant shouldn’t be flowing through the silver pipes and heater core. On HI they should be hottest as the coolant enters the pipes and core. N It sounds like you are getting the opposite.

Double check the hose connections first - some of the parts sites have photos of the Bypass valve and the rats nest of hoses that can help you see which valve port and which hose belong together. Also make sure the vacuum lines are connected on the valve and solenoid. If they are correct, you may have a bum valve.

Won’t solve the 08 issue, but should at least get the hot coolant into the right place as a start.

Good luck.

~pme


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