Heat climate control doesn/t blow warm air when on lower setting

Climate Control A/C Heat Defrost Mode Actuator

this part has many names blend door actuator etc. It is car and car option "Climate Control" feature specific and located under the dash.

Before replacing confirm that the inlet and outlet heater hoses are both to hot to hold. The hoses connect at the fire wall on the van and if the return is not hot with setting to full heat than there is a restriction in the coolant path through the heater core.

The heater door actuator is the most likely culprit. If the air is bi passing the heater core it will be at best warm. Raising and lowering the temperature setting the movement of the door can be heard.

Hope this helps?

Are you able to control the driver side air temperature at the dash registers? If not and you can control the passenger side of the dual climate system then you have an issue with the air temperature control door (moves between the heater core heated air and the AC evaporator cold air stream) deep inside the dash or the electric actuator that moves it or in most cases both.

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warmth comes from the heater in the car
if it is climate control check the climate control module
check for heater control in the vent settings as the hot water tap may not be turning on

could be an air lock in the heater rad, back flush with a hose to clear.

I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

Common Jeep problem. Blend doors are either jammed or broken. Dashboard removal is require to repair.

water vlv could be bad it is on the drivers side of the engine compatment looks like 2 cyl with hoses on either side

normal for an engine to start at elevated rpm and then die back as it takes a few seconds for the ECM doing it's sensor checks and idle back to the correct idle speed
check the idle rpm with an external rpm counter as most in dash units are inaccurate at rpm lower than 1000
as for the temperature
If you have a climate control module, it uses a mixture of heater and ac to maintain the temperature that you have set
so check it for operation

generally this is caused by a "blend door " motor (actually a vacuum control) not working. I don't have a diagram on this but if you watch the motors mounted to the heater box under the dash, and operate the control, you likely will find one not moving (check all positions including a/c)