Question about 1998 Mercury Grand Marquis
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Posted on Jan 02, 2017
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May 06, 2014 | 1994 Cadillac Eldorado
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The overheating of the car can be due to many reasons and you need to check on each one to confirm the working of the system.
1. In the first place the working of the engine must be assessed. it must be smooth with a good indication that the tuning timing and the power seems good. This will confirm that the settings of the engine is good and so there is less scope that the engine seems to heat up on its own.
2. Secondly the radiator pressure cap must be tight and good, the radiator MUST not loose coolant after a run or in a few days time- since this must be a sealed system and there is no scope of water overflow or loss unless there is a leak- sometimes the leak is too microscopic as under high pressure only steam might escape and so reduce the coolant. So check for leaks while the engine is hot , specially the radiator, the hose or the fittings.
3. The working of the water pump must be good to ensure a good flow and circulation, so check for leak in the water pump, check for presence of water in the exhaust or leaking on the engine gaskets.
4.Make sure that the coolant is good and clean if not drain and refill , if there is presence of rust please have a good flushing of the radiator or else the chances are that the radiator ports can be blocked and reduce the efficiency of the cooling .
5. Finally the cooling fan, the radiator fan must be working, check the thermostat/thermistor to work accordingly with good flow, have a good water jet wash on the radiator for a clean radiator cooling fin exposure.
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