1998 Mercury Sable Back pressure

1998 MERCURY SABLE
132,000 MILES • 6 CYL • 2WD • AUTOMATIC
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KENDROLET
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Water was leaking from the coolant reservoir...I replaced it. Then pressure was building up and forcing water out through the top of the reservoir...first I replaced the thermostat...then I removed it. Then my hearter core started leaking so I have that by-passed. Water pressure continues to build up and force water out through the top of the reservoir. This has all happened over about 3 weeks.
What could be causing this?
Oct 8, 2010 at 6:54 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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