Heater problem

[dsotm]

What would cause my heater to not work all the time?

Started my truck early this morning, drove to work and it was working, shut truck off for 1/2 hour then got back in and noticed it was blowing cold air........cold Alberta air

[Twistedcummins]

Is it intermittent? Or did it just quit altogether? Might be your heater core?

[dsotm]

Yeah it is off and on

i drove 45 minutes then stopped, put my gloves on the dash and it started blowing cold air.

The other time was like i said, drove to work, turned off truck for 1/2 hr then strated it again and immediately noticed it blowing cold air.


I read somewhere else that low coolant level may cause this, any truth?