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No heat how do I flush heater core out 99 mercury sable LS DOHC ?

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Find where pipes are going into heater rad(usually near the bulk head) disconnect both, I usually use a spark plug to insert into hose so as not to loose water from engine block, use hose from house tap insert into heater rad and flush until clean.

Posted on Oct 18, 2013

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Posted on Jan 02, 2017

  • 899 Answers

SOURCE: no heat/99 mercury sable

its not a fuse if the blower motor works , you have a clogged or bad thermastat, bad water pump or your radiator heater core is clogged

Posted on Nov 25, 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

wracefans24
  • 1985 Answers

SOURCE: 98 sable -no heat. changed thermostat, new

Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Posted on Jan 02, 2010

  • 1 Answer

SOURCE: flushing the heater core

I removed the hoses and took a air nozzle at low pressure and blew in the return hose connection of the core. A big chunk of paste like substance shot out then pure liquid. I put the hoses back on and tested it. Now its blowing hot!!!!!!!

Posted on Dec 14, 2010

  • 1 Answer

SOURCE: My 99 Blazer won't blow hot air. The Heater core

2002 Ford Taurus heater blows cold air

Posted on Mar 02, 2012

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1 Answer

2001 Mercury Sable 3.0 v6 heating problem had a flush done and changed the thermostat put new coolant in, replaced heater core, replaced blend door what else can it be


First make sure you dont have an air lock in your heater core and make sure you feel heat from the two heater hoses if you do fell heat your problem is under dash. If the hoses are not hot you have a blockage some where you may have a heater valve not operating it works by vaccum if u have AC look in the engine compartment or it maybe under the dash by heater core, I belive its in engine bay by Ac and heater boxes

Joe

Oct 08, 2012 | 2001 Mercury Sable

1 Answer

While driving my 1998 Mercury Sable with the heat on. It will start out with really warm heat and then 40 seconds later it willstart to cool down. If I turn off the heat and wait wait a minute it will


This sounds like a classic problem with the heater core. The heater core is like a small radiator that is located under the dash (likely). If the vehicle hasn't been maintained properly with regard to the coolant, the heater core can become clogged over time and need to be replaced. Years ago, there was also a problem with mixing the green and red coolant. This caused the fluid to gel especially in the smaller passages of the radiator and the heater core. Did you install an in-line port when you flushed the system? A little household water pressure flowing thru the system might help blow the clog out. Other than that, replacing the heater core Will likely solve the problem. Good luck!

Jan 15, 2012 | 1998 Mercury Sable

1 Answer

1998 mercury sable temp guage says hot, but no heat


water pump or thermostateis stuck or cloged

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Two things.........either it's a bad blender motor,or more likely,plugged heater core..Remove heater hose from near thermostat and heater hose from water pump,and flush from water pump side heater hose back thru the heater core and out the thermostat side heater hose with a pistol grip type water nozzle. don-ohio

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99 mecury sable replaced thermostat and housing freeze plugs heater core radiator head gaskets and heads... still over heats going up hills and heater not working.


heater cores is probly pluged take a garden hose and try to flush it out. usualy the heater core is the waterpump bypas. it also could be that ur radiator fans arnt running

Nov 18, 2010 | 1999 Mercury Sable

1 Answer

No heat


if engine temp is normal after running awhile. i would try to flush the heater core.(disconnecting the heater hoses from engine and flushing separately) ford cars and trucks have a "brown coolant" problem and the coolant will eventually clog heater core.

Dec 13, 2008 | 1999 Mercury Sable

3 Answers

No heat/99 mercury sable


its not a fuse if the blower motor works , you have a clogged or bad thermastat, bad water pump or your radiator heater core is clogged

Nov 25, 2008 | 1999 Mercury Sable

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