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Resolved!!! Mazda is being very helpful. I guess they just had to get word to the right people. They are helping me a lot with the repair. Its on back order for about a week and a half but the car is derivable. So after all this, it will finally be fixed soon. I know the mechanics are only doing...

yeah. Its ridiculous. I've had 2 cars that never had an issue with the heater core. My dad hasn't had any issues on any of his cars either. I'm wondering if it has something to do with Mazdas special brand FL22 coolant. Mazda has a bulletin for the dealers about flushing the heater core for...

Update. I have a few diagrams on the thermostat and it is in the correct way. I just heard back from the dealership. I reluctantly agreed to let them flush the heater core themselves even though I already did it. They said it helped a little but its weak, pointing to a bad heater core. In case...

I tried that way before. Im just wondering how that lets any trapped air escape from the system. For other cars, I have seen the best way to burp the system is to use the lisle spill free funnel kit. it locks onto the radiator cap spot and you fill it about halfway with coolant and then run the...

Thanks. I have so many diagrams printed out Its probably the whole repair manual by now. The diagrams shows its right. I'm about to give up until the dealer can see it, but I will try to burp the system a few more times to make sure the heater core doesn't have air trapped. I wish I had a...

I flushed the heater core last night. Water seemed to flow with no problem. I did a reverse flush and a little debris came out but nothing that seems like it could have clogged the core. I burped the system this morning. but the heat still isn't working. I'm at a loss. With a brand new...

That's what I'm thinking also, so I will have to do my own flush. They told me that this car doesnt have a heater control valve at all. I even checked through the hoses and done see anything extra on them that looks like that. The check engine trouble code is saying engine coolant temp sensor...

I took out the glove box and got a good look at the connections. The actuator seems to function correctly. When I switch between A/C and heat the actuator moves and for what I hear it seems that the blend door is working. However it is possible the its moving, but not all the way. I've looked at...

So the dealership wont get to my car until next week. I'm going to try to troubleshoot some things this weekend. I'm not sure if the issue with the heat is related to the engine code. Especially since I just replaced the thermostat. Why didn't mazda put in a temperature gauge? Anyway, Sometimes...

yeah, they told me they ran water through it and had no signs of blockage, but who knows. I did slip off part of the panel under the glove box and I can see the heater core. the lower pipe gets really hot, while the upper pipe takes a while to get warm but does not feel as hot as the lower. I'm...

I called the dealership shop this morning. They said they were going to call the mazda techs to see what they say. I will try to check the connections with the blend door, but I was wondering something else. Does anyone know of the cx-5 has a heater control valve? I tried fining it in the shop...

Just put in the new thermostat. It's a Mazda brand thermostat. Put coolant back in and burped the cooling system with a lisle spill free funnel kit. I ran the car for at least 20 minutes. No more bubbles came from the funnel. Car still doesn't get heat. It will feel warm for a few seconds then...

Both ECT's are the same exact part number. I am about to replace the thermostat just to make sure the current one isn't defective. The dealership checked the wiring and heater core. The first time I took it to the dealership they reprogrammed the computer so that should have been the latest...

Mobile One has a 0W-20 that's cheap compared to mazda brand. Last time I got it I think it was about $26 at Walmart.

Yeah, the mechanic at the dealership tested that already. He even gave me the diagram of the ECU pins highlighted with what he tested. But Just to make sure I will check that out myself also.

Originally I used an OBII scanner to clear it. I'm assuming the dealership used theirs to do it as well. Also, the repair manual that the shop uses says to removed the negative battery terminal when replacing the ECT sensors, and the whole battery to replace the thermostat. In both cases I...

Update: After maxda suggested I recplace the ECT sensor again, I did just in case I got a defective one. The check engine light came right back on the next day. I know what the symptoms are pointing to (heater core blockage, or bad thermostat) I took out the thermostat to do the boiling water...

I appreciate the advice on here that's actually helpful. It seems that some ignored the part where I had it checked out by the dealership in order to get it over with. They told me everything they did. So far they reprogrammed, flushed the heater core to make sure it wasn't blocked, tested the...

Update: Mazda dealership just called me. They said they tested everything and its all checking out fine. They called the head mechanics at Mazda to explain everything and see what they said. They said it might be a faulty Coolant temperature sensor next to the firewall and that would be $101...

I've already replaced the thermostat. After checking everything out and not noticing any issues I took it to the dealer. Of course they charge $90 just to check it (scam artists). They tell me its an issue with the computer needing reprogrammed and that it was going to be done free due to a...