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Hello, what kind of vehicle is this, year make model? It blows good heat only on low fan speed? Are both heater hoses hot?
Ok are both hoses to the front heater core hot? Does this have auxillary heat and ac and if so does the rear heater work ok? Is it low on coolant? EATC climate control system?
Temp sounds a little low but should give decent heat. how cold does it get when you turn the blower on high speeed?
The fresh air intake is below the windshield wiper cowling.The fresh/recirculate door opening is behind the glove box.
Ok. Take a look at the fresh/recirculate door if you can see it you should see the door open and close when you change from fresh air to recirculate. Only thing that could be an issue is if a portion of the blend door isnt working or cracked and not sealing off the airflow when you increase the fan speed and forcing a portion of the door open.You would have to remove the blower motor and look up through the oening in the ac/heater case to inspect the recirculate door.
It should be a vacuum dashpot that acutates the fresh air blend door.
When you turn the switch to max ac it closes the fresh air door and when you turn it to normal ac it opens the door
Correct, if you dont have a switch to toggle from recirculate to fresh air
Both heater hoses should be the same temperature, with one side being lower, it is indicating a restriction in the core. the air inlet is below the windshield wiper black plastic cowl panels
Not 100 percent sure either 5/8 or 3/4 on the older model, should be a quick disconnect hose going to both inlet and outlet.
Very good it should flow out evenly on both outlets with both hoses disconnected.
Hello, do you need more help with this concern?