Regarding Heater Core
For some time now I have been trying to figure out why my heater blows air when on hot, but the air is never warm.
I tried watering down my coolant, backflushing the heater core, etc. Nothing seemed to work. Both core hoses seemed to get hot pretty much the same, so I was baffled.
However, when I took the bottom plastic cover (partially, I could not get the entire thing off) off, I was able to reach my hand in and feel the metal intake and exit lines on the core itself under the dash. This is when things became a little interesting:
The intake metal line to the core was seering hot. Good I said. However the exit line wasn't even warm. Weird.
When I felt the face of the core itself, half of it was cool (on hot line intake side! Weird), and warm on the exit side. Weird.
I would imagine that although some of that doesn't make sense to me, the core is mostly blocked. As hot as that intake line was, that entire unit should have been very, very warm, at least - I would think.
Now I have already tried back flusing the core with a garden hose, I guess it didn't do anything. Is this a candidate for replacement? If so, how difficult is that? Or is there anything else I should try, first.