Heater not hot on 1999 Volvo S70

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Heater isn't blowing hot, barely Luke warm.
What could be the problem?
(1) Answer
(1) Comments
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Low collant or air pocket, bad themostate, restricted flow, blend doors not operating.
Wow, ok that's a broad range, but thanks I will chk it out