If you have a vacuum gauge, you can check for vacuum at the two lines I previously mentioned on the engine side of the firewall. If you have good and consistent vacuum in the two lines, then you can eliminate anything done in the engine compartment. Your focus would then be on the inside of the firewall.
You should be able to see the colored vacuum lines coming out of the solenoid control block to the left of the vacuum reservoir. Those colored lines go to each individual vacuum bellows.
The work you did in the engine compartment would disconnect a vacuum line in under the dash. Unless you knocked something loose in the dash during the radio swap (vacuum or electrical connector).
DEWFPO
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1998 S90 083,228 and 1995 964 154,100
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