Lexus RX350 2010 vx 2012

I too have a 2004 Lexus RX330 with 85,000 miles. I've never had a problem with it. I just passed it on to my daughter because it's getting older and the dashboard just spontaneously cracked in two places. It's always been garaged so I don't know why this happened. I just bought a 2012 RX350 to replace it and I love it. I haven't come across any issues in this model. I would get an estimate on fixing that heating problem. If it's too much - get the newer model. I once spent $3,000 fixing the air conditioning on a fairly new Honda and it never got cold enough after that. Always regretting trying to fix it.

Try purging air out of the cooling system. Sounds like the coolant level may be low.

Since the 2010 and 2012 are the same body style, I'd opt for the 2012 if you don't mind paying a little extra. We have the 2010 which is the first model year of the changeover from the 2004-2009 body style (2004-2006 was the RX330/2007-2009 was renamed RX350 but had the same body style as previous 3 years). While my wife loves the 2010, we noticed they fixed a few minor flaws and added some extra features for 2011 & 2012 that we would've appreciated. Since Lexus makes minor changes to the RX every 3 years and then major changes to the RX every 6 years, we recommend buying at least the "middle model" of any 3-year run.