Multiple Fluid and electrical issue
If it's the red engine light then engine damage has already occurred, fill engine to to the full mark and if it still runs carefully drive it too a shop for repairs. If it is the yellow light then there are codes in the engine management system, most parts stores can read these for you, so write then down and repost them back here and someone will help you with further diagnostics. Low coolant and the heat issue maybe one in the same, no heat is the very first sign of low coolant just before the engine starts too overheat. If the turn signals still flash it may just be a bulb that burned out, if none of the turn signals blink but just stay on it is usually the flasher unit, if they don't turn on at all could be a turn signal switch or blown fuse.
Check the coolant level, it may be low.
Thanks for the best answer points, hope some of the information was helpful.
Hey tennisshoes, don't spend all those points in the same place....
HA HA HA maybe someday I'll catch up with Tom
That would be some feat indeed!
Looking for a Used Regal in your area?
CarGurus has 5,098 nationwide Regal listings starting at $2,495.
Search Buick Regal Questions
Buick Regal Experts