The heater in my truck only produces air that is 45’F even after running for over 30 minutes. My mechanic put in a hotter thermostat and it has improved fuel econmy but it still can be uncomfortable to drive in the cold. Any suggestions regarding why I can’t produce heat in the cab of the vehicle?
Not enough info here.
check air blend doors in plenum for stuck or not moving.
If electric operated, check door motor.
If vacuum operated, check for vacuum leaks all over; door motors, switch, valve, and lines.
Try placing a piece of cardboard in front of the radiator, covering up about 2/3 of it.
If the heater core is partially plugged because of skipped flushes, you won’t get enough heated fluid through there for Alaskan winters. Make sure you have good circulation through those hoses.
check air blend doors in plenum for stuck or not moving. Everything functioning fine
Try cardboard in front of radiator this would not explain difficulties in the summer, nonetheless it is a normal addition in the winter. So far it has produced no additional value that can be recognized
Remove heater core. Replace with a new one. Don’t like that solution?
Remove both heater hoses from the ENGINE. Obtain a gallon of Muriatic acid. Read the precautions on the jug. Fill the heater with the acid. Let stand overnight. Drain and flush the heater core, taking the necessary precautions of course…Re-connect the hoses to the engine, top up the anti-freeze and try that…If, by chance, you have an ALUMINUM heater core, DO NOT DO THIS!!
If the heater core is made from aluminum, and you’re going dump muratic acid inside the heater core, I suggest you wear a chemical respirator and goggles. When muratic acid comes in contact with aluminum it creates chlorine gas. This means the lungs, esophagus, and mucus membranes can be corroded, the eyes burned, and causing vomiting/diarrhea.
In other words, if you’re not careful, you can end up on the floor looking like a fly that just got blasted from a half a can RAID.
Tester