1998 Volvo S90 Q&A
1998 Volvo S90 Question: There is a tapping/clicking noise when the engine is running.
replace cap, ensure that you replace any loss antifreeze, in radiator, and resovior bottle. may need to get air out of the system by bleeding system. If tapping continues seek shop help to determine the cause of the tapping/clicking. Also the vehicle may have set a code, may need diagnostic scan. - enhance yourself
repl cap and the seek insp of other issues - globalhelper