Unfortunately I’ve not changed my coolant for about 8 years and I know my heater core is bad because I used bars stop leak on it about 6 years ago. Obviously I need to properly flush and clean the cooling system but I dont want to contaminate the new heater core with the flush. Does anybody know if I should install a heater core bypass and then do a flush /clean of the system. After the flush is done, I would go ahead with the heater core install. It’s a a 1986 GT convertible 5.0 with air conditioning. The green coolant is only good for 3 years so I prey I won’t have other problems. The fluid looks normal and green. There is no oil or rust visibly in the system. You can see gunk on the radiator cap and inside the radiator which I believe may be the bars stop leak I hope. I also did a multimeter voltage test on the fluid which I think the results are ok.
I would appreciate any tips anyone might have.
Cheers
Gareth
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