There is a module under the center of the dash that controls the heat/ac. I have had it out 3 times. Now I have no heat. It says er on the climate control unit. I think the module is crap. Blower is fine. How do I get the codes and what do they mean. Is there a chart or PDF to list them. How much for the new module. Have not been able to find used one. Any ideas on what is wrong. Could it be thermostat.
Bob