2000 Linc Cont overheating. I replaced water pump, thermostat, belt & tensioner, blew through top hose out bottom (rad not clogged). Top hoses hot, bottom hose cold.
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Connie, Were the radiator,water pump and thermostat replaced to try and fix the over heat issue or as maintenance. Engine overheating can be caused by a lot of things, Leak in cooling system, air in system, bad rad. cap, slipping belt, faulty thermostat or installed upside down, faulty water pump, plugged radiator (inside/outside), collapsing rad hose, faulty cooling fan, leaking head gasket, sludge plugging engine water passages, poorly tuned engine, etc..
Take into a good shop for diagnoses and estimate for repair. Check the attached links,instruction and guides, Good luck
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check thermostat in boiling water make sure it opens. make sure it is not fitted up side down, check the radiator pressure with a gauge there may be a leaking head gasket. also check the relief valve on the radiator cap.
the water pump is run by the timing belt under the plastic cover. big expensive job. maybe you just need a thermostat. hopfully you didnt blow the head gasket. best of to have an expert take a look before changing stuff for no reason.
your cars radiator hose is building excessive pressure because the coolant / water could not circulate freely on your cooling system thats why its overheating, try removing the thermostat valve first and observe if it makes a difference, if problem is the same it could be the water pump is the culprit. try eliminating the easy things and less expensive approach first before deciding to top overhaul the engine of your car. a broken head gasket is not enough reason wont blow off your top radiator hose.
Remove and raise upper hose at thermostat end and remove lower rad hose. Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily. Honda rads are cheap.....any restriction....replace rad.
Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose. Flush good.
Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.
Stop leak can plug everything.
Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW! Water pump is optional at this mileage.
The thermostat is bolted into the bottom of the water pump, the lower radiator hose connects to a cover that holds the thermostat to the water pump.
the thermostat can be difficult to get at because the AC and power steering pump are all bolted on top of the water pump,
Your problem may not be a bad thermostat. I would also check:
1) water pump, some of the vw pumps are poorly made & tend to go bad.
2) fans belts, it can be tricky to get the right tension on these belts due to a badly designed tensioner system on the power steering & water pump belt.
3) hoses, radiator, coolant tank,. the radiators and coolant tank tend to leak when they get old, the plastic cracks or the rubber seals go bad. Also check the electrical system controlling the engine cooling fans. there are sensors and relays that can go bad. I have owned 8 vw's most of the major problems with these cars was due to electical problems.
4) Engine problems such as a blown head gaskets, or ignition timing problems can cause overheating. luckily VW engines usually don't have these problems, unlike other companies 4 cylinder engines (the Dodge Neons for example)
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