Hello Scotty, my name is Ionel, I live in Uk and I own a skoda octavia, from 2013, 1.6tdi and 7-speed DSG gearbox, 85000 miles on board. recently, the water pump failed. Before changing the pump and the timing belt, I used a strong sealer to stop the leak, as an emergency and temporary method, because in 2 days I was going to do the technical inspection (MOT). Immediately after the car was repaired, I no longer had heat in the cabin. I only get very little warm air. I don't think the radiator / matrix is clogged, because it heats up very much at both ends. I don't know where the problem is.
It sounds like you have a clogged heater core. Flush it back and forth with water a few times to see if it helps, but you might need to replace it.
would it heat up so much, both at the exit and at the entrance, if it were clogged?
you said the radiator heated up so now I'm confused.
radiator cools the engine. heater core keep the driver warm.
I wasn't talking about the main radiator that cools the engine. I was referring to what you call the heater core, which in this part of the world is often called the matrix, and some people call it the cabin radiator. I apologise for the misunderstanding
I apologise for the misunderstanding
I see. So in that case you could have a problem with the mechanism which blends hot and cold air. Maybe the motor is burned out, or the door is stuck. You will need to remove some dashboard panels to access it. Sorry I don't know more details about the Octavia.
the heater core heats up at both ends; the antifreeze has been flushed recently and is at the correct level; I don’t belive that there is air in the installation; the blower engine works; the flaps seem to work; if the defect is electronic, how is it that before the repair, everything worked well?
No worries. Thank you very much.
I must also add that the newer generation VAG vehicles are notorious for having blocked heater cores. So check if the flush clogged or ruined it, because they are cheaply made. I’d take it back to the place which flushed your coolant & complain. Let them figure it out. Once you have your correct diagnosis, you can make an informed decision.
Try this - https://youtu.be/MRa6c9UfyEs
Because if the above reset doesn’t fix it, I’m afraid @mountainmanjoe is right. You’ll need VCDS to properly diagnose what’s going on in your HVAC system.
I have seen this earlier today but I don’t have the chance to try it yet. I have a couple of OBD readers, but they don’t found any thing. I need a proper VCDS. Thank you.
Yup, VAG vehicles need VCDS for diagnosis. Regular OBD2 readers are useless for their vehicles’ extremely complex electronics.