replace? why not fix it?
replace the heater core
Your heater core is leaking, Need to REPLACE HEATER CORE.
The air is off.
Coming out of the vents around 43 degrees
Whatever it is set to on your heater's control keypad.
Dust coming out of air vents is usually caused by a buildup of dust and debris in the air ducts. When the HVAC system is turned on, the air pushes the dust out through the vents. Regular cleaning and maintenance of the air ducts can help prevent this issue.
55 degrees above zero Fahrenheit
Air conditioning unit has iced up. Don't use it for a while and it should come right
If there isn't enough air coming out of the vents, it could be due to a clogged air filter, which restricts airflow. Additionally, issues with the ductwork, such as blockages or leaks, can also impede air distribution. It's advisable to check the air filter first and replace it if it’s dirty. If the problem persists, consider having a professional inspect your HVAC system for any underlying issues.
replace the temperature switch it i sthe one on the right of three in the middle of dash I have same problem on my 98 it took me like 6 hours to get to the problem but it worth
There may be something blocking the deflectors from sending air up there.
you should probably run a duster thorgh it and/or check the pipes to it with it running =there might be an air leak