S80 Air & heat problems

[Headutter]

I have 175,000 on a 2000 s80 2.9. Around March blower came on strong with blast of cold air. No heat since. Now the need for cold air in July. Air comes on full blast at any temperature setting until manually adjusting blower long after temperature has been reach. Even if I turn up thermostat to 80. Then in stop and go traffic air goes out completely. Must shut it off, wait, them put back on for short relief. Help!