I have a 2000 STS, what is the thermostat temp? and what should the heater be putting out? Its at the caddy dealer right now, getting a coolant flush. They are teling me at idle the heater should do 120F, i thinks thats BS... if it has a 195 stat, the heater should do at least 175F or so on the freeway and maybe 150-160F min at idle. HELP ME. I need to kick their rear ends.. took em 4 trips to fix my A/C this summer and this is the second trip for my heater!