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put in the higher temp unit. 92C. Engine is happier, heat flows better, and you'll be a little warmer in winter. You might also consider a cooling system flush and coolant replacement at the same time. Use coolant mix of 50-50 GREEN antifreeze and STEAM distilled water. More antifreeze doesn't enhance protection, less can impair the anti-corrosion effects.
Welcome to the BBRD. Have you got some books yet? Owner's manual (available from Volvo) and/or Haynes shop manual and - definitely - the Bentley Shop Manual. The latter two are usually available on eBay.
Veni Vidi Volvo
Good Luck,
Bob
:>)
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