1998 Mercury Sable Back pressure

1998 MERCURY SABLE
132,000 MILES • 6 CYL • 2WD • AUTOMATIC
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KENDROLET
  • MEMBER
  • 1 POST
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 7, 2010 at 11:54 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Try this test. With the engine cold, open the radiator cap and start the engine. Does the coolant start spilling over or shooting out?
Oct 26, 2010 at 3:43 AM
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