I have a 2003 accord v6, dual climate control. I have heat on the passenger side, but not on the driver's side. I checked the following: 1. Coolant-flushed system and replaced coolant 2.Heat control valve functioning 3. Both heater core hoses are hot (in and out) 4. Blend door actuators on both sides seem to be working (observed) 5. Checked for codes (thanks Poorman212) and none displayed. I don't know if something's become detached, or the blend door is partially stuck, but each actuator cycles then stops, and doesn't try to continue to run like the door is stuck. I've read several posts in regard to this issue, and am trying to narrow it down. Thanks in advance for your assistance!

 

There is a possibility the heater core is partially clogged. You may have to directly flush the heater core if that was not already done, to see if it fixes the issue.

Although this service bulletin is for 2012, 2013-14 CR-Vs, the issue sounds similar.

 

Where can I purchase the flush kit or do I need to build it?

 

Is this a service a dealer will offer and at what cost ?

 

The system had a general 20 min. Flush.

 

Thanks Redbull-1 for the information. I contacted a local dealer and they want $300.00 for the core flush, which isn't bad since it takes about 2.5-3 hours to do. Way better than 2200.00 for a new heater core! (if it works).

 

You're welcome. Let us know it goes.

 

I've read where you can DYI this with a drill pump, hose, clr and a hose filter. What do you think?

 

You can always try to flush the heater core yourself.

 

We use a small pump, garden hose and some regular strength drain-o. You will want to disconnect the heater core lines and back flush through the return line. After that back flush with plenty of clean water, again with a garden hose, let drain, reconnect lines and add coolant. No matter what you use the most important thing is to back flush it via the return line.