If one hose is hot and the other is cold it is because the coolant is not circulating through the heater core. There is nothing else that can cause this. (no valves in the system, etc.)
Make sure that the heater core outlet hose (the one that is cold) is not kinked or pinched to prevent proper flow. If this is OK then replace the heater core. I have seen heater cores that look like they are passing water well enough when flushed with a hose but were too resricted to pass the low-pressure water from the water pump.
The outlet hose is not really cold, just not as hot. The air is cold. How difficult is it to diagnose a baffle problem under the dashboard? I noticed that when it does heat the passenger side is warm and the driver side is cold.
The diagnostic trouble codes (DTC) set by the HVAC programmer can be displayed by the "On-board" method.
Press and hold the OFF, AUTO, and RECIRC buttons for one second.
The DTCs will display for two seconds each, and then return to normal operation.
Here is a list of possible DTCs for the HVAC programmer.
DTC DESCRIPTION
B1310 Ambient Air Temperature Sensor
B1317 Inside Air Temperature Sensor
B1318 Drivers Solar Sensor
B1324 A/C Pressure Condition
B1328 Passenger Solar Sensor
B1330 Left Panel Sensor Fault
B1331 Right Panel Sensor Fault
B1332 Left Heater Sensor Fault
B1333 Right Heater Sensor Fault
B1334 Passenger Climate Control Assembly Out of Range
B1340 Air Mix Door #1 Movement Fault
B1341 Air Mix Door #2 Movement Fault
B1343 Air Inlet Door Movement Fault
B1344 Mode Door Movement Fault
B1399 Loss of KDD Communications
B1652 Loss of Keep Alive Memory (KAM)
B1982 Source/Battery Voltage High
B1983 Source/Battery Voltage Low
U1016 Loss of PCM Communication
U1064 Loss of SBM Communication
U1096 Loss of IPC Communication
U1255 Generic Loss of Communication
Thanks for much for your help! I tried the three-button process and all it did was blink. I tried holding it for 1 sec, 3 sec, and 10 sec. Nothing.
If all it displays is several blinking dashes( - - - - ) then there isnothing wrong with your interior vent system. As you can see from the fault code list, if there is a broken hot/cold mix door or a faulty hot/cold mix door motor, fault codes B1340 or B1341 will be present. Recheck the engine cooling system. Make sure it is full and bled properly. You may be getting air pockets. Check the thermostat operation to make sure it is not stuck open or opening too soon.
×
1,045 views
Usually answered in minutes!
×