no heat or cold heat

[Mile High VX]

is there any test to see if it the heater core so i dont do a 10 hr job for nothing??

Have a shop pressure test your system. Should be able to pressurize the system and it should stay and not lose pressure. If there is a pressure loss you have a system leak someplace.

By process of elimination if you don't have any leaky hoses then you likely have a leak in the heater core.

Also, have you noticed your windshield fogging up in the morning when you start it or any moisture on the passenger side carpet?

If all of this is normal you may have a clog starting to form in the core that you can flush out.

Here is a link on flushing a heater core...not sure this is the best chemical to use (looks like CLR) but you'll get the idea.

http://www.youtube.com/watch?v=dcL_0TWeZJY


Hope this helps