Valvoline blew out my heater core!!!

I go into Valvoline to get an oil change and a radiator flush. While driving to work the next day I notice the smell of anti-freeze. I stop pop the hood and don't see any leaks. I am getting steam on the windows. I call my mechanic and he tells me that it sounds like a blown heater core from the backflushing that Valvoline does. He said it is the third one he has had in in the past two months from Valvoline. I called Valvoline and they offered to top off the fluids and take a look but said that if it was blown it is not their fault. I will not go into what else was said but was not good. Anyway do not go there and have this done.

What year is your truck?Some were known for the heater core problem,just the way they were made.

The flush probably opened up a blockage that was stopping the leak.

How old is your heater core.

I agree that there was some crude stoping up a hole and they flushed it out. Like having a nail in your tire as soon as you pull it out there goes the air.

Yip, my point exactly.

Coolant system flushes cannot cause a blown heater core.

Ok.. thanks for the advise and insight... is this something I could do myself or would it be better for certified mechanic to do? Special tools needed? Anyone have instructions?

This is no easy job.

How good are you at automotive work?