1997 850 over heating, leak in coolant system

[alschnertz]

Heater core failures are very common on these cars.
There are several write-ups on the repair.
Be sure to evaluate the firewall coupling too. It is possible that the seals in it are ready for replacement.

I removed my firewall coupling altogether and ran conventional heater hoses from the engine to the core.

[cn90]

At this age mileage, this is what I did:
- New ebay heater core $45 or so. Make sure you get the Volvo OEM O-rings!
- Got rid of the firewall coupler
- Re-used the old barb fittings and rebuilt the heater hoses using new Gates heater hoses for a few $.

All detail below...

DIY: 1998 Volvo S70 GLT Heater Core, Heater Hoses Rebuild!
https://www.matthewsvolvosite.com/forums ... hp?t=69238