I have a 2007 Volvo S60 that stopped putting out heat after replacing the battery. All worked well before. I disconnected the old battery, negative cable first, then the positive. I reconnected the positive cable first, then the negative. The climate control fan works, it feels like it is blowing cold air (It is hard to tell if it is A/C or just cold outside air). Both hoses to the heater core are hot. I vacuumed out the square grill where the thermistor is hidden. Is there a procedure to recalibrate the ECC?

 

A little more info to work with. I started and ran the car until the engine coolant gauge was at the 12:00 position. The outdoor temperature was 36 degrees F. I turned both temperature ***** to full cold (blue), I could hear flap motors move by hearing the change in wind noise. I placed a digital thermometer in the center vent opening.The temperature coming out was 43 degrees F. I then turned the temperature ***** to full heat (red). Again, I could hear a change in the wind noise. The temperature coming out of the vent was 61 degrees. that was as warm as it got. Again, both hoses going to the heater core feel hot. All uses check out fine. What is ironic is that everything worked great before the battery replacement. Any more ideas? Any recommendations on a good, inexpensive scan/reset tool that will work on Volvo, Audis & other?

 

I did a little more poking around over the weekend. Could I have a blocked heater core? I ran the car for 5 minutes at 2000 RPM. The temperature gauge was at the 12:00 position. The outdoor temperature was 33 degrees F. Using a non-contact temperature sensor, I read 203 F at thermostat housing, 158F at lower radiator hose, 180F at drivers side heater hose, 158F at passenger side heater hose & 77F at center heat duct outlet. Any thoughts?