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Q: Heater doesn't work when idling and coolant leaking?
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How much fuel does a SUV waste idling?

Effectively all the fuel that it burns while idling. You are getting 0 miles per gallon while idling.


Why does your heater blow cold air while idling but blows hot air while driving?

Low coolant, failed thermostat, partially plugged heater core...............


Heater starts to turn cold when at stop light - what causes that?

The #1 cause of cold air from the heater when the car is stopped, or the engine is idling, low engine coolant levels.


Why does the heater on a 2008 impala police package run cold while idling?

There are two hoses that go to the heater core, when the coolant is flushed an air pocket forms preventing hot coolant from reaching heater core while at idle. Happened with all our police impalas. Tell the dealer to fix it.


Is the thermostat bad if the heater puts out hot air while in motion and cool air when idling?

May have an answer already, but be sure that the radiator is full of coolant.


What would cause the heat in a car to turn cold when the car is idling?

Could be low on coolant, a stuck open thermostat or a partially blocked heater core.


What causes a 1997 Dodge Caravan to overheat when idling for more than 10 minutes?

BAd radiator cap, low coolant or (leaking), Bad thermostat, cooling fans not turning on.


Why would your Uplander throw heat while driving and cold air when idling?

Poor circulation through the heater core. Probably a semi-plugged heater core or a faulty thermostat (assuming the coolant level is full).


When 1998 Mitsubishi montero is left idling there is no heat output but when in drive and moving heat flows. Is this normal for this vehicle?

No, I would suspect a stuck open thermostat, a failing (worn) water pump or clogged heater core. Also chedk for a sticking heater control valve in the coolant circuit if fitted. It could also be a internally swelled heater hose from the block to the heater core blocking proper coolant flow..


How do you install a heater coil on a 1993 Chevrolet Blazer 2-door 1500 model?

Drain coolant, remove anti freeze plug from block (corresponding size to the size of your heater coil plug) and install this plug carefully, using a large nut and a hammer. Refill coolant, let engine idling warm up, check coolant again and the installed heater plug for leaks. Now you can insall the cables, away from any moving or hot parts.


When my car goes on the highway the heater doesn't work very goodwhy is this?

If it blows warm while idling and cool as you accelerate down the road, the coolant is low and or doesn't have proper mixture for your avg. temperature.


Why does 1993 Ford Tempo Overheat when idling?

Its prob the radiator fan. Or you are out of coolant.