Question about Mercury Cougar

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Hi my 1999 mercury cougar does not blow out heat, cool air and the defrost doesnt work. i really wanna get it fixed before it starts getting really cold. can anyone tell me whats wrong? is it a fuse?

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Check coolant level first.

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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Car over heating


low coolant, need a new thermostat, air in the cooling system, blown head gasket

Mar 16, 2013 | 1999 Mercury Cougar

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it dont matter what engine we talk about,the closer to the top of the engine the the better,it might be the top hose etc,,,,.start the engine and let the air out of the system it will be very hot so watch outonce the air bubbles stop then lock the system/tighten the nut,etc.adrian,,,,

Jul 26, 2010 | 1999 Mercury Cougar

1 Answer

My 1999 cougars heater is blowing out cold air. it blows out warm air on setting one but when i put it on 2 or 3 or 4 its cold i am going to get my anti freeze flushed this week and see what happens but i...


Check the thermostat in the cooling circuit for the heat problem; it could be stuck. As for the O2 sensor.....Check the thermostat first. Its cheaper.

Dec 02, 2009 | 1999 Mercury Cougar

1 Answer

Low Heat on 1999 Mercury Cougar


I had the same problem with my 199 cougar 2.0 4 cyl.
The problem was air in the cooling system.

I had to bleed the air out of the system, and now the heat
works much better.

I put a flushing tee between the back of the thermostat and
the heater core, and made sure that water flowed out of there.
Then I disconnected the small hose from the top of the coolant
resevoir, and poured water into it using a funnel until the coolant
level started to rise in the coolant resevoir. Then started the car, left the radiator cap off, and let it come up to temperature (thermostat open)
then over a period of about 5 minutes, periodically "goosed" the engine to clear any remaining air bubbles.

The heat is MUCH better now.

Oct 17, 2009 | 1999 Mercury Cougar

2 Answers

1999 mercury cougar only blows cold air, no heat.


It's very common in the Cougar, Hate to say it, but I think you know the answer. You need a new Heate Core, PS, Their a B#$%#.

Dec 12, 2008 | 1999 Mercury Cougar

2 Answers

My 99 cougar only blows cold air the hoses are hot,


maybe your thermostat is stuck open, you may need a new thermostat.

Dec 05, 2008 | 1999 Mercury Cougar

1 Answer

Heater not blowing hot air


If the fan motor is blowingthen this is a sign that the fuse is good, if it's not then check the fuse, or you may need a new fan. as for not blowing heat it could be that the gate valve in the heater lines is stuc closed for some reason, or you could need a new thermostat. as for fuse slots 5 & 6 I am not really sure for your car as I would need to see the fuse panel and what accessories you have. Good luck and remember to rate all the solutions you get, thanx.

Oct 29, 2008 | 1999 Mercury Cougar

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