Hi, new here so would appreciate some help. I have a 2013 Range rover sport 3.0 diesel and have an issue with the heater blowers not getting warm. The engine seems to struggle to get warm and stay warm. Changed the thermostat but no change. No local mechanics know where to start

Have any of the mechanics checked the error codes stored in the ECUs? That's the first place to start.

Best bet is finding a local Land Rover specialist rather than a general garage. These things are temperamental and like to mess you around if you're not careful. Finding someone who knows them is a key step in staying on top of the car. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Thanks for your reply mate. Mechanics said they did a scan not nothing came up relating to it. Rang a couple of landy specialists near me and they basically said they hasn't come across an issue like it. Seems more like they don't want to take it on. Don't know what to do with it to be honest. Issue started when it went in for engine manifold replacement with timing belt, water pump and crankshaft oil seal. Was fine before that