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You need to have the fluid changed and replaced with fresh fluid. The reason it is currently boiling the fluid and causing it to spill out is because of the drop in viscosity of the current fluid and is unable to perform its duties. I would take it to a local AAMCO transmission shop, they have always done good work for me.
There must be a" T " hose before the heaters' radiator, that would not allow the water to circulate back to the cars' radiator to be cooled off properly. Or the switch that would open and the close the routing.
Two things.........either it's a bad blender motor,or more likely,plugged heater core..Remove heater hose from near thermostat and heater hose from water pump,and flush from water pump side heater hose back thru the heater core and out the thermostat side heater hose with a pistol grip type water nozzle. don-ohio
Check that the hoses running from the cooling system to the dashboard / firewall are not bent / creased in a position to impair the flow of hot water into the heater core in the dashboard. Disconnect these hoses at both ends, and inspect for mineral deposits, or rust, that might be blocking water passage too.
Well there's only part that has to do with the cooling system and serp belt - the water pump!! Maybe it's starting to seize or has too much play. Either way, when you change the water pump, replace the thermostat and flush the system very thoroughly, those 98-99's are notorious for rust build up. Make sure to pull the heater hoses off and flush the heater core too. After all said is done, purge the coolant and make sure there is heat from the blower. If not you're going to have to replace the heater core because that gets clogged sometimes when flushing.
Couple of things....if your radiator is gunked up on the inside or the outside even from debris, that can cause poor flow/circulation and not cool enough for your motor. Also, the thermostat can stick and cause overheating. One last thing, the fans. If the fans aren't running you won't get proper cooling either....that's pretty much it!
the rust issue is related to the design of the cooling system, in a word ford screwed up, air gets trapped in the system and causes it to rust, the heater core is most likely plugged with rust, pull the hoses off at the firewall to the core and back flush the heater core, this should ge the rust out, then have the cooling system flushed with a power flusher, this will be a shop repair but there is no way around it, u may want to contact Ford/Mercury about a possible recall on the cooling system for this rust issue, as far as the A/C goes it is not related, does the compressor engage? let me know.