i have an 03 mini cooper the heat works sorta its like warm breath never hot idk whats wrong. it has coolant.

 

Just had my water pump changed and a new thermostat put in and now my heat is balzing hot. Just make sure that you dont have a leak in your coolant.

I dont have much knowledge with this, so i'm not sure what else can be wrong.

Hopefully some one can give you a little more insight.

 

Sounds like a stuck-open thermostat. It will never reach full operating temp with that happening, and you get a luke-warm heater experience.

Where does your thermostat needle get to? That sensor is right at the thermostat housing. Even better you can put your car into diagnostic mode and get a numerical display:
See "How to show RPM, Fuel Level, Speed and more on your Odometer Digital Display"
on this site: http://www.mini2.com/forum/faq.php?faq=faq_interior

 

An R50 in good order will be quite toasty. Mine has the best heat of any car I've owned, and I love it. I'd suspect thermostat, but don't overlook a clogged heater core, if the car wasn't serviced well. I just went through that with my '01 Ram. Flushed everything out, and now has heat.