No heat from vents & a mild odour from the engine area? Please advise. Thanks, Elaine

Low coolant level or air bubble in cooling system. Have cooling system level checked and or bled.

The vacuum line has probably slipped off of the flapper that controls airflow to that side, or the hose is cracked.

have the fuel system checked for leaks and have the EVAP system checked for proper operation. as far as repair costs depends on what is causing your problem.

The condensation is not completely draining. You may want to see if it is plugged. Find the drain area in the engine compartment on the bottom of the firewall. Use an air compressor to blow air back through to clear it. I had a problem with that area which was a ford expedition design flaw. It was draining onto my O2 Sensor and damaging it. I had to make a bypass with a part form a GM truck.

check your heater relay switch and blower but first the switch : )

yes it happens more than you know vent doors are actuated by vaccuum and electrical wiring. pull the radio back out and look for unplugged lines or see if vent doors around the radio area are jammed or broken, could have something hung up in the wire area. when the radio is out turn on the a/c and move the vent controls and see what happens in the radio rest area checking for vent/ actuator movement

You need to clean your A/C main vent from center console using a special A/C cleaning equipment with ultrasonic waves. Here in Europe it's easy to find a workshop with this special A/C cleaning equipment with ultrasonic waves. I suggest you to search a workshop in your area, and ask them for this special A/C cleaning equipment with ultrasonic waves.

Assuming the engine gets up to temp,,feel the heater hoses after the truck is warmed up ,if one hose is hot ,the other cold,core is plugged ,may not leak but the flow is restricted

Older lead acid batterys used to emit a lot of vapour when they heated up hence needing breather tubes. Battery technology has moved on quite a lot and most are now sealed for life type batterys which dont need a vent tube hence "sealed"

John

have the oil pressure checked using a mechanical gauge
indications are that the oil pressure sender unit is stuck at the same pressure reading