Heater not working?

As far as the ABS light, chances are there is a sensor that is bad at one of the wheels or the wiring is damaged. Check that first. If you find nothing, have the computer scanned to see if it will identify where the problem is coming from. Most parts stores will do it for free.

As far as the heater, it sounds like the blend door is stuck. It is the vent door that determines if you get heat or AC into the car. If it is stuck in the AC position, you won't get heat.

This can be a couple of things. You have a water valve item 12 in pic see if is passing water through it so it will be hot both sides. Then there are temp actuators on LH (shown second pic) and Rh they may not be working. But pull the hvac fuse for 60 seconds with key then reinstall sometimes these reset. Otherwise they may not be working.

You have a stuck or damaged blend door. It is what sends the air either past the heater core or the AC. If it isn't opening properly, you won't get heat or AC based on what position it is stuck in.

With the engine running, hot, and the heater on, feel both heater core hoses. Both should be hot. Let me know what you find.

Joe

They are a pain because it is near the heater core and tough to get to. If you are sure the blend door is the problem, follow the cable to it and watch to see if it is working.

Also, make sure the engine is warming up to normal operating temp and both heater core hoses are getting hot. If both are hot, then chances are the blend door is the problem. If only one hose is hot, then chances are the heater core is plugged.

One last thing (simple) make sure the coolant is full in both the radiator and overflow. Only open the radiator when the vehicle is cold.

Sorry !
Since we know what is the problem I would suggest getting another opinion
check with another shop for an opinion where they can check it physically for you and tell you what is happening or happened
best of luck

IT sounds like the blend door is sticking. The blend door is a vent door that opens and closes to allow either AC or Heat to enter the vehicle. If stuck in the wrong position, you will get cold air all of the time. The blend door is located in the HVAC system near the heater core.

Let me know what you find.

Joe

Need a new blend door actuator
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need manual CHECK IT @
https://www.2carpros.com/kpages/auto_repair_manuals.htm

If it is just the actuator it shouldnt be too expensive. But if somehting is wrong with the door (pop sound) then the dash will have to come apart and that will start to get pricey