No heat after oil change.
I recently purchased a new to me 91 6 cylinder YJ, and decided to change the oil in it, also changed the air filter. The old oil filter was on VERY tight and took a bit of wrenching and cussing to get off. Finished the oil change and while driving to work realized the heater no longer blows hot air, but the fan is still working on all settings just no hot air. My question is there something near the oil filter I could have hit that could be causing this. And this morning before the oil change while running around the heater was working.