1996 Mercury Sable why does it not heat

Tiny
SUMMER RITENOUR
  • MEMBER
  • 1996 MERCURY SABLE
Heater problem
1996 Mercury Sable Automatic

My heat in my car will come on and work for about 10 mins. After that it only blows out cold air. If I turn the blow and all off and leave it off for about 25-30 mins. Then turn it back on it will blow hot air again for about 10 mins and then do it all again. Do you have and clue as to what could be causing this
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Wednesday, November 19th, 2008 AT 1:44 PM

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Tiny
BMRFIXIT
  • EXPERT
Check and replace thermostat
if thermostat OK
Check heater hoses if not hot you need to Flush heater core
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
good luck
let me know
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Thursday, November 20th, 2008 AT 8:10 PM

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