Question about 2004 Mazda 6

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No heat Temp gage is fluctuating from hot to cold. I have no heat in the car, and the maintenance light is on!

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If your coolant level isn't dangerously low, the drive belt for the water pump (it may be driving other things too) might be loose and the thermostat could be failing.
Most thermostats divert coolant first through the heater core and then allow water to flow through both the radiator and heater core once the engine temp starts to rise.
Be careful not to let your coolant temperature to rise too high as this can cause headgasket failure increasing the cost if not damaging the engine elsewhere. 

Posted on Jan 02, 2009

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From what you have posted, it sounds like your coolant level is low. With engine cold, re-fill the system, then check carefully for leaks. One leak has been located you can take necessary steps to correct it.
Generally the reason for your problem symptoms is that the coolant level has dropped below the level of the cylinder head. This can cause the head to overheat and warp, bloww a head gasket, or both! (both substantial $ to repair) DO NOT drive vehicle with this condition, till you have found and corrected the problem!!!
Good Luck!!

Posted on Jan 02, 2009

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