Question about 2007 Mercury Montego AWD Sedan

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Alternator losing power

When the car warms up and gets hot the gauges drop and the car cuts off and then come back on and sometimes it cuts completely off while driving.

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Posted on Jan 02, 2017

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SOURCE: already changed fuel filter. Symptoms first

clogged catalytic converter perhaps?

Posted on Oct 05, 2010

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SOURCE: I have a 2000 grand

It sounds like the engine thermostat is defective, this is the cause of the loss of heat when driving. Another posibilty is that the cooling system is corroded and the heater core is plugged. Let star with changing out the engine thermostat, I am pretty sure that will fix the problem.

Things You'll Need:

  • Drain pan
  • Pliers
  • 3/8-inch ratchet and socket set
  • Replacement thermostat and O-ring
  • 50-50 pre-diluted coolant
  1. Allow the engine to cool before you work on the cooling system. Put the drain pan underneath the middle of the radiator. Open the petcock at the base of the radiator and drain approximately one gallon of coolant from the radiator; close the petcock. Lift off the engine cover at the top of the engine by hand.
  2. Locate the connection between the upper radiator hose and the engine. Remove the clamp on the hose at the engine using the pliers. Pull the hose off the thermostat housing. Unbolt the thermostat housing from the engine using the 3/8-inch ratchet and socket. Lift it off and take out the thermostat and the O-ring.
  3. Set the replacement O-ring and thermostat into the engine. Bolt the thermostat housing to the engine using the 3/8-inch ratchet and socket. Push the radiator hose onto the thermostat housing and reinstall the clamp using the pliers.
  4. Open the radiator cap and fill the radiator with 50-50 pre-diluted coolant.

Posted on Jan 22, 2011

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