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

 

I had the same problem on my 300M...it was the BLEND DOOR ACCUATOR...

Look back on previous posts to find the diagnostic procedure...you can run a test from the ATC module..it will display an error code.

 

feel both heater lines into the fire wall both should be same temp if not clogged heater core.

 

Iwant2playnow, I dont get any codes. Display flashes but if I hit any buttonit stops flashing.

Tech, I checked one before I posted. I will search for the other one and check it.

Thanks, Chris

 

they are less then 1 inch from each other going into the fire wall.