Quote:
Originally Posted by griston64
If it was fitted with good quality rubber hoses from the factory which are now well over 20 years old if you replace with good quality rubber from Volvo they will also last another 20 odd years.
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What Mark said ^^^^^
DON'T use Waterless coolant in a red block either, it's been shown in the past to cause leaks and overheating. Also
don't use OAT coolant, it's not suitable for cast iron engines and not suitable for anything made before 2000 anyway.
Use a good quality ethylene glycol concentrate and mix 50/50 with clean water. Ideally flush the whole system through backwards with clean water, drain it out by removing the bottom hose, refit the bottom hose then add the ~4.5L of EG antifreeze then top up with water.
Run up to temperature and allow to cool overnight, topping up with water if needed.