How long did it take you to replace the heater core?

 

Was the heater core clogged?

 

Gel built up, yes. It take me 4 hours to finish

 

........... It's a pretty involved project.
.......................... Book rate is 9.5 HOURS..... First time through will take you MORE than that.

 

Here is a GMT 800 step by step video. This will show you whats involved step by step.

 

I stayed in post #10 that I had help replacing my heater core but I forgot to say how long it took.

It took us about 4 hours to finish, but it also took about 2 hours to start.
So two guys, one under the hood who needed instruction, about six hours.