5
questions

Hard to keep vehicle in it's lane, tends to wander all over road, first to one side then to other side after steering correction is made.

checked the in and out to the heater, hot going in cold coming out

The hose going in to the heater is hot but the hose coming out is cold I have blown air on to the temp sensor

2004 2500 avalanche what transferecase came w/8.1 and what is the low range ratio.

Dealer tells me it will take 2 visits due to code ID and has estimated $350 to repair, looking for better estimate.