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That page starts off..
testing check valve
pull connection from check valve 32
connect vacuum line of tester evacuate and read gauge
if gauge shows presure increase , replace check valve
next is testing vacuum reservoir
bottom line... replace gasket of vacuum res 33
then it goes to temperature switch... they are using special tester mentioned earlier...
you could start by replacing those items .... ???
it looks like there are only two check valves and they are both inside the car...
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