davidsauve
Member
- Joined
- February 6, 2010
- Messages
- 17
- Reaction score
- 0
- City, State
- Denver, CO
- Year, Model & Trim Level
- 97 Explorer EB
I have a 1997 Explorer EB V6 4.0 SOHC with the EATC. Everything works on the EATC panel except the defrost, panel or floor does not blow warm/hot air when the temp setpoint is high (75-90). The thermostat works (just changed to a new 195 degF), coolant is new, system was flushed with Prestone cleaner and flush kit. The heater hoses are both (inlet and outlet) are both hot to touch after 5 minutes of idling, so the heater core is getting hot coolant flow. I see the temp coolant control valve on the lower heater hose move when switching from heat to A/C. I've witnessed the blend door move from up (A/C) to down (Heat). When running the EATC diagnostics with the key in the on position, engine off, I get a code of 024 - blend door calib.
My only idea right now is that the heater core pipe is severely coated on the inside that no heat transfer/exchange is occurring in the heater core. And that a CLR flush and forced air flush would break up the coating. Am I going down the right path here or is there something else I need to diagnose. The likely culprit might be the blend door internals that I cannot see from under the dash are broken. How do I diagnose either condition above or other conditions I am not listing. THanks.
My only idea right now is that the heater core pipe is severely coated on the inside that no heat transfer/exchange is occurring in the heater core. And that a CLR flush and forced air flush would break up the coating. Am I going down the right path here or is there something else I need to diagnose. The likely culprit might be the blend door internals that I cannot see from under the dash are broken. How do I diagnose either condition above or other conditions I am not listing. THanks.