I own a 1997 Buick Regal (3.8l) with heat problems. Temp gauge reads about 25% during outside cold temps. Will read at 50% during the summer. During the winter, it takes a long time to warm up because the heater blows warm air...not hot. Also...the low collant light comes on / off at random times and the coolant level is good. I think it''s the thermostat. Any other suggestions?

 

1997 lasabre no heat blower blows cold air and temp indicator light blinks and outside air temp indicator blinks.