Join Date: Oct 2007
Location: Kansas City, MO
Drives: 2003 Sedona EX 3.5L V6 - 160k miles
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2003 Sedona Rear Heater blows cold - supply heater pipe hot, return heater pipe cold
Have 2003 Sedona EX 3.5L where the rear heat worked intermittantly last year. Rear air always switched to floor when the Rear Heater button was pushed on the dash but only occasionally could we get warm air blowing.
Thus far this fall, we cannot get any warm air from rear heater floor vents. Checked coolant level, which is fine. Checked heater pipes/hoses to rear and one line (presumably supply line) gets warm/hot and the other (presumably return line) stays cold.
Haven't found any other threads on this forum which describe this situation but from reading online all afternoon it sounds like it might be the blend door actuator (or whatever its called) for the rear heater. Would that make any sense? Seems strange to me that the return line wouldn't be the same temp as the supply line as I didn't think there was any "gate" to stop coolant flow in that rear circuit. Is this correct? Maybe I just didn't run the car long enough to let the return line heat up at the same point under the van as the supply line but we've driven for 90 minutes with the rear heater on and still not gotten any heat out of the rear floor vents.
Any thoughts or suggestions? I've no problem removing the rear trim to get at, and replace, the blend door actuator if that's the suspected problem. Kia's Global Service Way shop manual appears to be worthless on this issue - I can't even find anything about the rear heater.
I, and our freezing cold toddlers, thank you in advance.