Heat gets slightly warm when idling, but immediatly gets cohoses are ld when i start driving. The temperature gauge will rise just a little when its idling, but totaly drops afer I start driving. The thermostat has been replaced and all hoses are warm when idling.
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You have to make sure the thermostat is working properly and is the correct one. Idle the vehicle for about 20 minutes and then feel the upper radiator hose. It should be hot to the touch. Drive the vehicle and when the temp gauge falls to 'cold' stop and feel it again. If it is much cooler to the touch than before the thermostat is defective or wrong.
Could be a faulty thermostat. Take a piece of cardbourd and cut it so you can put it in front of the radiator and fix it so it will stay there. Drive the car and watch your temperature gauge to see if it warms up faster but be careful as to not let it overheat. If it starts to heat up cut a 1/4 of the cardboard so a little more of the radiator shows then watch the temperature gauge. Leave it there for the winter then take it out. That is the cheapest remedy when it is cold. I take it when your heater blows it is not not every warm is that correct?
Have you checked the coolant level? If it is low, what you describe will happen, the engine will run hot, and the heat won't seem to work (coolant level too low to circulate through the heater core). Hope it's that simple, if not, let me know and I'll attempt to help further. Good luck!