Took our first long road trip in the suburban last week. 1250 miles (one way) from IL to Snow Lake Manitoba for fishing. Remarkably, the truck got a little over 14 MPG! (Steady 70 MPH, A/C off, nothing on the roof but the OEM rack.)
The only problem was that after the first 9 hours when we stopped for gas I noticed a puddle of coolant under the truck :Wow1: I made the decision to stop for the night and make repairs while we were in a nice size town (Alexandria, MN) and not risk getting stranded in the middle of nowhere Manitoba.
After spending the night we were lucky and found a mechanic on-call on a Sunday and for only $135 and in 45 minutes he replaced the heater hose connector where it connects with the intake manifold. He even had the part on hand and owned the EZ-Out he needed to remove the broken connector. He barely had to torque the wrench when attempting to remove the connector when it broke, so we probably wouldn't have made it another 100 miles down the road before we had a catastrophic failure.
So a big shout out to Glenn's Towing in Alexandria, MN and his mechanic Steve for saving our vacation.
After the repair, the truck ran flawlessly for the remainder of the trip (~2000 miles). I did have to add about a quart of coolant when in Canada, but haven't added any since so it might have just been purging air pockets. Now that I am home I am going to have my local mechanic do a pressure check to see if I need to have the intake manifold gaskets replaced. (I bet I do).
Other than that I also noticed that I am leaking power steering fluid from the hydro-boost. This is also a well known issue and I just need to decide if I am going to try to replace the seals and gaskets on my unit or just buy a re-man hydro-boost.