So here is the scoop I purchased a 03 a4 a few months ago and the heat didn't work. I replaced the thermostat. Water pump and timing belt since my water pump was leaking. Still had issues I flushed the heater core 4 times with no luck.
so I ended up replacing the heater core bled all the air out and was STILL not getting warm air!
Recently I found that my head gasket was bad and letting air into the system so I got that fixed along with some other things and again after bleeding the air out there is no heat unless your around 2000 rpms. My shop is stumped, I'm getting frustrated. Does anyone have any sort of idea as to what's going on.
On a side note the day after I picked my car up from getting the head gasket done I was running some errands on rural streets and my heat spiked up between operating temperature and over heating. The whole time no heat but after the spike in temp I got a good amount of heat until after work when I went to go home. The temp spikes haven't happened again since that 1 time.
Thanks for taking the time to read this I know there are lots of threads out there but they seem to be all about flushing heater cores... and the problem I am having I don't think is a plugged heater core anymore
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