Question about Subaru Legacy
If your boost is gone, your best first bet is to look at vacuum lines in the engine bay - make sure none of them are cracked or dry-rotted. A vacuum leak will cause your boost pressure to vent to the atmosphere.
The car has a valve called a diverter valve or recirculation valve on it as well. Usually the OEM valves have plastic diaphragms that can fail and will cause your boost to bleed off. This valve will be piped into one of the inlet pipes between your intercooler and throttle body via a vacuum line - trace your vacuum lines back and you should be able to find it. An owner's forum for your car will probably have photos to show you its location. If that has failed (which can happen if your mileage is somewhat high, or if you have a boost controller to raise the boost), you'll have no boost.
Vacuum leaks of some sort or other are the typical culprit in lost boost pressure about 99% of the time - most of the time you can find them just by inspecting the vacuum lines. If you find one that's disconnected, reconnect it, and if one is cracked or broken, replace it, and your problem should be solved.
Posted on Jul 25, 2008
You need to check power to low pressure switch, that is on
If there is no power in there, then the problem is between the switch and control panel.It is possible the compressor clutch s bad.if there is power to the compressor and still does not run then compressor clutch is bad.
Posted on Jul 24, 2008
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Posted on Jan 02, 2017
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