Heat Issues in 1999 XK8
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Do you know what the system was refilled with? Different coolant types are generally incompatible and can gel when mixed. Best is to go to jagrepair.com, find the vehicle spec guide and double check the exact coolant type your engine calls for. It's going to be between the older green stuff and the newer dexcool orange stuff.
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UPDATE: After going through all of the suggestions from the forum and other videos, I FINALLY managed to get to the local shop and have them back flush the heater core. There was some yellowish gooey fluid buildup in the hoses and the actual core, but it later cleared. At first the heat amount was not that much better but as I drove it around after picking up, it got warmer and warmer. I think I now have adequate heat in the car. Thanks for everyone's suggestions.
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