Question about 1996 Mercury Sable
There are several causes. I need to know what kind of car? milage? this iwll determine if they are manual controls, or electronic controls. Do you see any water/ antifreeze dripping from under the dash? If no...probably a control wire or vacuum line that should be opening a valve to allow hot water to run through the heater, that is not moving, remaining closed, NOT allowing hot water to run through the heater.
Posted on Oct 21, 2013
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Posted on Jan 02, 2017
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
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Posted on Mar 01, 2009
SOURCE: 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.
Posted on Oct 23, 2009
2004 mercury mountaineer.heat problem
When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.
Posted on Nov 11, 2010
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