I bought a 1 owner 2000 S-Type from FL with 63M miles. When I got it back to Indy I found the heat not working. Will blow faintly warm at idle but cool while driving. I self- diagnosed a heater control valve and bought it on ebay. A friend who is a Honda mechanic was going to install it but he noticed that the hose under the thermostat remained cool even after idling 20+ mins. Anyone had any experience in this. I think I will swap out the thermostat even though it always acts normally and heats up to norm range while driving. Any input is appreciated.