Is it true if you have heat in the inside of your car, your thermostat
I have a 98 ford escort, and an 86 ford escort (diesel) and I'm in
Alaska, so It's just started to warm up, and if I drive with the heat
off they are both overheating. Also if the inside heat was off during
the winter time they would overheat as well.
Heat in the cabin only means you have some coolant and that the Thermostat
isnt stuck open.. the heater takeoff is on the engine side of the thermostat.
I'm not a REAL cold weather denizen, but there's a good possibility that one
or both are stuck shut if the cars both overheated in subzero weather and
In very cold weather the cabin heater may cool the engine below the
But bear in mind that you ALSO may have a gunked up cooling system
No, it isn't true. The coolant can get through the heater core at all times,
but the radiator is thermostatically controlled.
Check here: http://auto.howstuffworks.com/cooling-system2.htm
for a diagram that kind of shows this.
I've had a thermostat actually come apart inside the housing. I'm sure it
was trying to work, but the crimp had failed and there was nothing for the
active part to push itself against, causing the plate to stay closed 100% of
the time. I had plenty of heat, and the water was boiling inside the block.
You could hear and feel the big bubbles doing their thing. Thermostat was
replaced after making sure all of the old unit was accounted for.
Thankfully, no damage was done.
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