The thermostat Closes to allow the Water in the Block to HEAT UP,,
it ISNOT shutting off the WATER INTAKE.. it is Shurtting off The Water
This allows the Water pump to put the Warm water into the HEATER CORE .
When the Block Water reaches 195 degrees, the thermostate opens Breaflt
to all some water to cool the water down a little then it immediately
closes again to KEEP the HOT ( 195degree water Flowing thru the Heater
If the Thermastate was to open continuously then you would Get Cold HEAT
because The Radiator FAN is Keeping the WATER cold in the Radiator !
hard to follow this one. the statement about the thermostat
controlling the water flow is correct, so I don't see how that's
Either the heater core gets hot or it does not.....if the thermostat
is working then both heater hoses that run to the heater core should
be warm to hot and you have heat.
there may be a number of other issues but if the heat is not working
you first look to the water supply.
You stated that there will be no heat until
the thermostat opens. If this was true, I'd
never get any heat on -30 degree day, as
the t-stat probably doesn't open at all on
the drive to work and back.
As other's have mentioned, coolant within
the engine and heater hoses/core circulate
even while the t/stat is closed.
Pull you glovebox liner out... just to the left is a white plastic
adjustment for the 'heater' cable that controls
the heater flap. Make sure the flap it closed tight, even a'little cold air
will kill the heat.
Sounds like the heater core may be plugged or you have a bad heater
hose. The temperature spikes are because the coolant isn't bypassing
through the core the way it would normally. I'd just replace the heater
core and the heater hoses, not a bad job on a P/U.
"logan126" < email@example.com> wrote in message
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