Honda 2002 Accord With Faulty Heat

I have a 2002 Accord v6 EX 4dr, with automatic temperature control where the heat doesn’t work. I’ve had it in at the dealer 6 times for several week or more visits that resulted in them giving up on the car. They replaced the radiator, the thermostat (twice), the heater core/heater box (twice), the head gasket, the timing belt and the water pump and the problem continues to persist. There was about a 3 week period after the second heater core replacement where it worked great. But the problem returned.

I was wondering if I could mess with working on the ambient sensors that feedback the temp to the auto temp control in order to see if that’s all that is wrong. I found three sensors, 1. Ambient sensor mounted in the front of the car, 2. Sun Beam sensor located on top of the dash, and 3. a Sensor assembly with an aspirating hose which appears to be mounted under the dash. What can I change and what would I need an expert to change? Do you think this might help? The parts aren’t that expensive. If you have any other ideas, I’m would like to hear! Thanks!

I would think the dealer would have tested these components while they were working on the problem.

You say the heat doesn’t work. Can you be more precise? Does the heater core get hot? You can tell by feeling the hoses after the engine warms up.

The hoses that lead to the heater core do get hot, and the tech at the dealer did say that if you squeeze the hoses a bit, you can get more heat in the car. I’ve thought about adding an electric pump inline with the heater core hoses to attempt to get the flow going.

And yes, I would have thought the same. I’m just at a loss as to what to do next. I’ve spent a LOT of money on this already.