I have a 1999 LHS with luke warm heat. I checked for codes, topped off coolant(not very low), blead air(only coolant came out). The first time this happened I put the temp down to low then back to high and I got heat. This is not the case any more. If I put the heat on high and auto the a/c icon comes on the display. I can here vent door move when switching from floor, dash, defrost.
Any help will be appreciated