808Legacy

I guess I'll need to study up on burping it. Just drove it to get hose, gauge stayed where it's usually been, just below midway, which I know is a little hot. I didn't play with heater, though, I'm scared to. I did call a reputable shop on the island and he said it could be a sensor for the gauge. Going to start with the hose first. This is a (hopefully minor) project car. Needs left CV axle, and I'd love to find out why it makes this throaty, hoarse sound toward the rear when I give it gas. Needs a driver's side lock cylinder replacement (I guess I need a locksmith?), new wiper sprayers...

It did that after I topped it off. I just checked the hose leading to the thermostat, and it has a small leak when I squeeze it, so I guess I ought to start there, replacing that hose, right? Would that be causing an air pocket? Also, would the check engine light be affected by that, or I guess there is no way of knowing?

New user here, my 5th Subaru. Just got this '94 Legacy Fwd and have barely driven it. Bought it from an elderly couple, original owners, who seemed to take care of it (needed new struts, a new CV axle, might need a new muffler: making hoarse, throaty sound in back, but exhaust all looks ok) So, the check engine light has been on and off, engine runs good and strong, but I noticed that it runs a wee bit warm: needle is usually in middle. It was a little low on coolant, so I added 60/40 yesterday, but needle stays in middle. Then, last night, I was driving home, I decided to run the heater full blast to see if that cooled it any, and it did the opposite! The needle went almost to the top, then came back to middle when I turned heat OFF. Then, it kind of went up for a little, then back to middle. Wondering if it's a sensor related to check engine light, thermostat, air pocket? All of the above? Radiator is very new, btw, maybe a year old max. Any ideas are greatly appreciated!