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Re: car does not get warm. dash gauge sits close to
The most likely cause is the thermostat stuck in the fully open position which allows maximum coolant flow between the engine and radiator in very cold conditions. In such such conditions the coolant temperature will not increase to optimum and will run cold constantly.
You will need to have the thermostat removed and inspected. It is an inexpensive item and I would replace it with a new one.
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If you have a temperature gauge on your dash you can read the engine coolant temperature. After overnight the gauge should be low and during about a 15 minute warm up cycle should achieve about mid range on the dash gauge. It should stabilize at this point with minimal fluctuation through out normal driving.
If you do not have a temperature gauge use an OBDII scan tool where you can read out the engine temperature as you would read the gauge.
A passenger can observe the live readout on the scanner that are equipped with such features while you operate the car.
Could be but, it could also be the thermostat. Do you have a temp gauge in the car or just a dummy light that flashes. If you have a gauge, where does it sit when the car is warmed up? Doe's it ever go over to the hot side but not quite over heat? If yest then I'd be replacing that, because it's stuck, and it's a whole lot cheaper than having them go back under your dash. If the dealer fixed it before and it hasn't been a year, you may still be under warranty for the repair also.
Check these three possibilities: One, car has a bad thermostat. Two: Car has a bad heater control valve and three: Car has a vac leak under the dash that controls the heater Flap Valve. If this flapper isn't closed completely, cool outside air mixes with the warm inside (recirculating) air and cause a lukewarm air mixture at the vents.
Aside from flushing the radiator and heater core andreplacing your hoses, did you happen to replace your thermostat. Sounds to me like that's your problem if everything else seems to be in order. If you change the thermostat and still have no heat, you might check your vacuum lines running to the back of your heater controls inside your dash. That's really the only other thing that I believe could be causing your lack of heat.
Hope this helps! Have a great day and try to stay warm!