2001 Oldsmobile Alero "car overheats unless heater" Questions

...overheats. i have a small leak from the coolant expansion tank but not a big enough one to drain the whole tank. it seems like the tank overfl start car fine, heater doesnt blow hot unless temp gauge ...

...unless i am going 60 mph. It does not overheat. when i open the radiator cap it bubbles back at me. the heater core is not leaking water into the car. I replaced the thermostat about 6 months ago. ...

...overheats; doesn't put out any heat through heater unless I rev engine to 3,000 rpm, then heat comes into cabin,as soon one more weird thing is the oil light flickers on and off when idling even ...

...Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged ...

...to overheat unless its leaking coolant and coolant level low, if car is running hot make sure your radiator cooling fan is coming on, fan won;t come on unless a/c is on or engine reaches 228 ...

...unless I have the heater turned on full blast? my daughters jeep started overheating so we replaced the thermostat. flushed out the system and put new antifreeze in it. it still runs hot but when you ...

overheats unless heater is on? You most likely need a new thermometer Engine fan is not coming on ,wene engine is running your fan will come on wene heater or air cond is on , check engine temp sensor

car dosn't overheat and no smell from coolant If the engine temp gauge reads like normal, then you either have a bad heater core, or the valve that feeds the engine coolant to the heater core is stuck

...car in the last few months. Help. Thanks Did you flush out the heater core when you did the radiator.Im not sure how the air con could overheat your engine unless the pump was creating excessive ...

...unless it has leaked out enough coolant...If the car had a bad overheat you might have a bad head gasket.  A shop with a gas analyzer can check your coolant to see if there are excessive ...