Question about 1994 Mercury Sable

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Why does heater blow cool air?

Heater does not blow hot air consistently. Sometimes warm, sometimes cool.

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  • Mercury Master
  • 22,246 Answers

Old trick with any car ,firstly drain the antifreeze out then refit the bottom hose ,get a plastic bucket and add about a cupfull of caustic soda ,add hot water being usual carefull about this then when the caustic has disolved you add this to the radiator ,then providing the level is ok you refit the rad cap and run engine ,time ? depends say a half hour drive around town ,then let engine cool ,remove the bottom hose to drain being carefull as well whilst doing this .then remove the rad cap and flush it through
,then refit the bottom hose and remove a heater hose ,both it access allows then flush back through the heater hose ,both ways if you can both heater hoses off ,then refit one heater hose and let it back flush out through the rad cap then reverse this flow ,and if it all comes out nice and brown then clears you know your heater will work ,now drive car around with the water in for 5 mins then drain via bottom hose and then after fitting the bottom hose refill with antifreeze 50% min ,even in a frost free climate as the antifreeze is a anti corrosion agent as well .

Posted on Nov 20, 2014

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Posted on Jan 02, 2017

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  • 231 Answers

SOURCE: 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.

Posted on Oct 30, 2008

pkthoege
  • 93 Answers

SOURCE: 2002 mercury sable heater wont get hot

you have a broken or stuck temp blend door in the heater case. or the servo motor is broken. this sits on top of the heater case

Posted on Dec 02, 2008

onyeredson
  • 404 Answers

SOURCE: heater only blows cold air but hoses are hot

Hi!
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?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K

Posted on Mar 01, 2009

gordanddar
  • 477 Answers

SOURCE: temp guage showing hot, not getting any heat for 1992 Mercury Cap

If the hoses to and from the heater core are hot , and you say the heater core is hot , then the only answer is that the air duct that flows into or out of the heater core plenum ( housing ) is not opening.
Heater control on dash borad inoperative.
Not sure about 92 capri , some cars have a cable linkage , some work on vacume motors.
Try to find a haynes manual for your car , they will walk you through almost every step of anything you may ever want to do to your car.

You seem to know what you are doing , but I gotta ask ........the heater core you felt was up behind the dash inside the passenger compartment of the car right ?

Posted on May 10, 2009

ginko
  • 19396 Answers

SOURCE: 2003 mercury grand marquis LS

The blend door is stuck in cold position. That usually happens because the blend door actuator has failed.

You will need to test and replace the blend door actuator.

To replace the actuator you will need to take apart the dash and remove completely the instrument panel,d isconnect the connector, remove the four screws, remove the temperature blend door actuator and replace it.

The replacement is not a job for beginners, since you have to take apart the dash to access the actuator.

Regards.


Posted on Nov 18, 2009

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Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
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Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

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