What to do if your heater control valve is stuck?

If the temperature still doesn’t change on the outlet side, suspect a stuck shut or clogged heater control valve. Pinch off the hose on the outlet side of the heater control valve (the hose closest to the firewall) and drive the vehicle at highway speeds. If the blower stops blowing hot air, you’ve found the problem.

Where is the control valve on an A / C heater?

Heater Control Valve. It may be located on the inlet or the outlet port of the heater core, and activated by a cable, electronic control or a vacuum signal. This valve may be normally open, allowing coolant to flow until activated, or normally closed, allowing coolant to flow only when activated.

What can cause a heater control valve to crack?

Another common symptom of an issue with the heater control valve is coolant leaks. Over time the heater control valve can wear out and crack, which will cause coolant to leak from the valve.

Why is my Chevy 1500 heater not working?

When blower motor is on 2 highest settings,air can be heard roaring in the vent system but the proper amount of air volume coming from vents is not as when newer.Took door actuator off and seems to be working fine off of unit. Will explore the possibility of mode actuator being stuck or bad.The search for this problem continues.Post 5/26/2011.

Why are the heater controls on my truck not working?

Went out to start the truck and the heater controls were black wont come on no heat or ac. I have checked the fuses all good I have also put two new controls in and nothing.

How does the a / C and heater work in a car?

This is also controlled by the knobs or buttons on the climate control unit. When your heat or A/C is turned on, the blower motor is what forces the cold or warm air from your vehicle’s A/C and/or heating system through the interior vents, circulating it inside throughout the cabin.

Is the VAC line still connected to the heater?

In most cases the flap that directs your air flow, is controlled by vacuum lines, sometimes it’s a cable. You may want to check to see if the vac line is still connected. unfortunately you will probably have to tear the dash down some. 84fiero has a better handle on these issues. Maybe he’ll swing by, and add some thoughts.