Mechanics

HEATER PROBLEM (LOW HEAT)

1998 Mercury Sable

1998 Mercury Sable 6 cyl Front Wheel Drive 260000 miles

I seen on the internet that my heater problem might be caused by a vacuum leak and I was wondering where I could download a vacuum diagram for this car
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Jtstar
November 21, 2009.




Vacuum leak should have no effect on the heat or heater core
vacuum operate the selection door (like defrost, vent and so on )
very common is low or no heat due to a clogged heater core

have to isolate heater core and flush let me know
and if its the heater vacuum lines that you need let me know
I should have it for you

BMRFIXIT
Nov 21, 2009.
Thank you for that reply but I have taken the heater hoses off of both sides of the heater core and flushed water each way I did get some junk out of the heater core but I had very good flow of water comeing out also.
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Tiny
Jtstar
Nov 21, 2009.
More flushing is needed
try to and soak it with a coolant system flush over an hour or so
you have to have a good flow so you can get the heat

I would isolate the heater core hoses from the engine side
block bypass hose in-between
fill heater core with coolant system flush and let it sit

BMRFIXIT
Nov 21, 2009.

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