Question about 1992 Mercury Grand Marquis

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My engine keeps overheating; even the liquid in the coolant reservior is very hot (boiling). Does the radiater need a powerflush? Can I do this at home? Would simply changing the fluid make a difference? Thanks

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  • Mercury Master
  • 6,826 Answers

Make sure the thermostat is not stuck closed.
Remove and replace thermostat to check this problem.
Is the fan working on the radiator?
Is the fluid 50/50 Antifreeze to water mixture?
These are the questions I would ask.

Also, if the system is backflushed, then that might help if there is a mineral build up in the cooling system.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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You have an air bubble at the top of the engine.
The antifreeze spewing out of the overflow happens due to your perfectly functional radiator cap
passing the overheated coolant/air mixture out of the system into the reservior (in an attempt
to relieve overpressurization of the cooling system)
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The antifreeze spewing out of the overflow happens due to your perfectly functional radiator cap
passing the overheated coolant/air mixture out of the system into the reservior (in an attempt
to relieve overpressurization of the cooling system)
The sudden nature of your overheating comes from the boiling of the inadequate amount of
coolant/antifreeze in your engine, since it cant properly cool the engine, except for the first
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within the cooling system.
The Fix is free: locate and open the (air) bleeder port at the top of the engine, and add the usual
50% coolant/50% water mixture to the radiator until the radiator is full to the level indicated in
your owner's manual (or the "Full" line). Then close the bleeder port and replace the rad (radiator)
cap.
The air bleeder port is normally located near the thermostat, and should be opened each time
that coolant is added to the radiator. The air bleeder port need not be opened when adding
50/50 coolant to the reservior, since the rad cap is going to be closed while adding coolant
to this part of the cooling system.
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engine is replacement (of the engine). Seizing an engine is really easy with an air bubble in the
top of the engine - you could easily burn up/warp the head, necessitating replacement of the head
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