[brigand13]

I have a friend with a '93 Sentra... Her car overheated a couple weeks ago and she took it to a Sears auto to try to discover what was wrong. She was told that the Heater Core was bad and that was what caused the overheat.

This doesn't seem right to me, but I haven't done much work on cooling systems.

There is no coolant in the floorboard of the passenger side. From my research, it seems like there would be if the heater core was cracked and leaking. Also, I've driven the car and cannot find any leaks in the engine compartment. There isn't even any moisture.

I just need to know if it's possible for a bad heater core to cause overheating. Given the nature of the heater core, it doesn't seem like it is and the Haynes manual doesn't mention it as a cause for overheating.

Thanks in advance for any help you can give.