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under the dash, driver side
The 1991 Volvo brake light relay switch is located beneath the drivers side dashboard. The brake light relay switch will be above the brake pedal.
The VR is on the back of the alternator.
long answer: yes
Driver side, near the center, under the dash
it located under the rear driver side next to one of the fuel pumps
four inch
silver rectangle box located on the inside drivers side fender wall
On my 88 240 the wiper relay is located to the left of the clutch pedal, behind the insulation and a small metal plate - just pull the wires out from the top, and you should find the relay.
According to "Relay Locations" in the Bentley manual, the heated rear window time delay relay is located behind the right side of the center console.
It can be a little expensive to replace the EGR valve on the 1987 Volvo 240 DL. The job takes about 1 to 3 hours and can cost as much as about 240 dollars.
Behind the center console to the left of blower.