Dear Brettskie,
Hope you're well. When rads start to leak on 900 series cars, they must be replaced. Plastic gets brittle with time and heat. This cannot be reversed.
You should consult this site's Frequently Asked Questions (FAQs), which heading is misleading. The FAQs are a repair guide for 700 and 900 series cars.
I don't own a 960, but have replaced rads on several 940s. This is not a hugely hard job. You'll need basic socket tools (metrics, 3/8" drive ratchet), the usual screwdrivers, a 10" adjustable wrench.
I'd recommend strongly using a radiator made by Nissens, the Danish outfit that supplied radiators to Volvo, when these cars were made. Nissens units will drop into place and the transmission fluid lines will fit properly. Other makes likely will not fit precisely.
Key points: when tightening the transmission fluid lines, you must use two wrenches. An adjustable wrench goes on the hex fitting on the radiator. That wrench must be held absolutely still: it must never be turned. The other wrench goes on the fitting, at the end of the transmission fluid line. The fitting, on the end of the transmission fluid line, is the only one that may be turned, to secure the line to the radiator. If the hex fitting on the radiator is turned, the in-radiator transmission fluid cooler is likely to be damaged, allowing coolant to get into the transmission fluid. The water in the coolant will damage - and if not removed promptly - will destroy the tranny.
Apart from this, the radiator replacement should be straightforward. If the coolant overflow hose is factory-original, I'd replace it. Hoses are cheap: replacement engines are costly.
You can get a Nissens radiator from www.fcpgroton.com. The part is #8603739. The cost is $249 + shipping. I'd guess they'll ship to Guam: it is a US territory.
Hope this helps.
Yours faithfully,
Spook
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