I replaced a leaking heater core with a used core from a junkyard car. It doesn't leak, so it does the job...
Did several bleedings. First on flat ground, I didn't know it had to be raised. So I assumed air was trapped. Bled the system about 3 more times, progressively with the front of the car higher and higher, following the various guides to properly bleed it.
As I was bleeding it, the air out of the vents blew pretty warm with my hand right by the vent, so I figured, yeah that's good enough. Air bubbles don't appear to be coming out anymore from the screw.
But on the freeway, the air blows cold.
On the freeway, I would turn the temperature dial from hot to cold, wait a few seconds, and turn it back to hot... and I would momentarily feel warm-ish air come out.
At red lights, while the car idles, I get warm, near-hot air! When I turn the temp dial to cold, it gets cold. Excellent! Fan speed hardly affects air temp either way.
So if I'm getting hot air during idle when the car isn't moving, but literally cold air on the highway... would you suspect I have a stuck-open thermostat? I wish I could tell you what my instrument cluster temp gauge says, but it doesn't work (dead si board, yet another thing to fix). So I can't say what the water temp is. Would you suspect I still have air in the heater core?
1987 325is, nearly everything is stock, but don't assume everything works. Thanks in advance!
Did several bleedings. First on flat ground, I didn't know it had to be raised. So I assumed air was trapped. Bled the system about 3 more times, progressively with the front of the car higher and higher, following the various guides to properly bleed it.
As I was bleeding it, the air out of the vents blew pretty warm with my hand right by the vent, so I figured, yeah that's good enough. Air bubbles don't appear to be coming out anymore from the screw.
But on the freeway, the air blows cold.
On the freeway, I would turn the temperature dial from hot to cold, wait a few seconds, and turn it back to hot... and I would momentarily feel warm-ish air come out.
At red lights, while the car idles, I get warm, near-hot air! When I turn the temp dial to cold, it gets cold. Excellent! Fan speed hardly affects air temp either way.
So if I'm getting hot air during idle when the car isn't moving, but literally cold air on the highway... would you suspect I have a stuck-open thermostat? I wish I could tell you what my instrument cluster temp gauge says, but it doesn't work (dead si board, yet another thing to fix). So I can't say what the water temp is. Would you suspect I still have air in the heater core?
1987 325is, nearly everything is stock, but don't assume everything works. Thanks in advance!
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