How many hours does an average air cooled engine last?

Sounds like a leaking head gasket , or head itself is cracked. If overheating because of sticking thermostat heater would still work. Get it check fast cause next is a blown engine. I guess head might not be torqued properly. Take it back to overhauler and check for oil in your anti-freeze too.

Maybe you hold check the coolant level. If there isn't enough coolant in the system the first thing that stops working is the heater. If it is lie than you need to figure out where it is leaking. What engine do you have?

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The automotive air conditioner (A/C) compressor circulates freon through an evaporator and a condenser to cool the ambient air inside of a vehicle. This compressor is prone to failure due to a lack of lubricant or a mechanical issue, but the average backyard mechanic can replace it in about an hour.

Read more: How to Replace an A/C Compressor ' eHow.com http://www.ehow.com/how_5692334_replace-a_c-compressor.html#ixzz25N2DK44y

Google SinoyElectron to learn more about car diagnostic

crank pos. sensor

AFTER REPLACING THERMOSTAT DONT STOP OVERHEATING.CHECK THE COOLANT FAN CLUTCH.WITH HOT ENGINE THE CLUTCH FAN SHOULD HAVE RESISTANCE WHEN TURNING IT WITH HAND.IF NOT FREEWHEEL.FAULTY CLUTCH FAN.HAVE TO REPLACE CLUTCH ON FAN.BAD CLUTCH ON COOLING FAN WILL CAUSE ENGINE OVERHEAT.WHEN CLUTCH FAN FREEWHEELS AT HIGH SPEEDS NOT PULLING ENOUGH AIR THROUGH RADIATOR CORES TO COOL DOWN ANTIFREEZE AND ENGINE.

There are five trip computer displays which may be stepped through by pushing the MODE button. The information will appear in the following order:

D AVG ECON (Average Fuel Economy): This shows the average fuel economy since the last reset.

D INST ECON (Instantaneous Fuel Economy): This shows fuel economy for the most recent second of driving.

D RANGE (Trip Range): This shows the estimated distance that can be traveled with the remaining fuel. The fuel economy used to calculate range is based on the last few hours of driving. When in a low fuel condition, LO is displayed.

D FUEL USED (Trip Fuel Used): This shows the accumulated fuel used since the last reset.

D AVG SPEED (Average Speed): This shows the average speed since the last reset.

You can download a replacement Owner's Manual here: 2002 Chevrolet Impala Owner's Manual (PDF file from www.gmownercenter.com)

Sounds like the radiator is not moving enough air. Is the fins plugged with dirt or bugs?

The cooling fans are designed to come on at about 215 degrees to 219 degrees,and I have seen them come on at 225 degrees,the engine is designed to average 232 degrees at the most,it may not be warm enough to come on the first time,but the thermostat,if stuck will prevent this also,and you need to bleed the air out of the cooling system.

hi depending on how they opperate they could probably charge up to about 2 hours labour... you would be supprised at how much mechanics round off their numbers

emma, how is the coolant level? Have you had to add any? Check the cooling fan(s) to make sure they are kicking on when the engine temperature rises. If they are not going on, check for a bad cooling fan switch.