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heater control valve

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How to Remove and Replace a Heater Control Valve
The heater valve is integral to a vehicle’s cooling system. Replacing one requires a new valve, some basic tools, and fresh coolant.
How to Replace a Heater Control Valve
Car heater control valves regulate the flow of coolant into the cabin. Heating and cooling issues result when the heater control valve fails.

Related questions

Question
Very little heat from vents 2004 Mini Cooper
Hello - the lack of heater function could have 5 causes: the engine is not getting up to correct temperature (center of the gauge) due to a malfunctioning thermostat - not likely in your case since the temp gauge is...
Question
Heater not working 2005 Acura TL
Hello - you may have a bad water pump and clogged radiator. When engine overheating occurs at low engine speeds, it indicates the engine is unable to transfer heat to the radiator and cool the engine. It would also result...
Question
no heater
The lines to the firewall could be hot and yet the heater control valve is not admitting the heated coolant to the heater core in the dash. So, you want to inspect that valve and make sure it is moving...
Question
fan working but no heating
Common causes of no cabin heat include malfunctioning blend door(s) (part of the in-dash ventilation network), a faulty or stuck heater control valve, a plugged heater core, collapsed hoses, and low coolant level. The cost to resolve the problem depends...
Question
Heater doesn't work
The heater control valve may not be opening fully and/or the heater core, beneath and within the dash, may be partially plugged. In both cases, the result would be inadequate heated engine coolant flow through the heater core and no...
Question
Heat not working
Plugging it in won't resolve the issue. Your vehicle has a conventional heater core through which hot engine coolant, from the internal combustion (IC) engine, circulates. If the no heat condition is occurring while the vehicle's IC engine is running,...
Question
My heater only blows cold air
Check the operation of the heater control valve, which is often located on the engine compartment firewall. If that valve doesn't move to the commanded position, or move fully, you will have a no heat condition. If the valve is...
Question
Cars overheating but engine is cold and the heater blows cold air
Hello...the simplest option is to just request an engine overheating diagnostic and the responding certified mechanic will identify the root cause(s) of the troubles you are writing in about and get the repair estimated for you. Repairs can be commenced...
Question
Heater fan seems to surge
Hello. Your vehicle does use a vacuum operated heater control valve to allow hot coolant into the vehicle's heater core so that warm air can be generated. If you hear an opening and closing sound then it may be possible...
Question
Car overheats when only in idle
Overheating at idle could be due to non functioning electric cooling fans. Other causes of overheating include trapped air in the cooling passageways, a faulty thermostat, a plugged radiator, collapsed hoses, and a faulty water pump or drive belt. Certain...
Question
Coolant flush
A cooling system flush will extend to the heater core. Although no cabin heat can be caused by blocked cooling system passageways there are many "as likely" causes of the no heat condition. Consequently, the most efficient approach is to...
Question
Heater issue
What you are describing sounds like an intermittent failure of the blower motor that circulates air in the HVAC system, however, there are certain faults that could occur in the electric circuit that powers the blower motor. If power is...
Question
Heater not working properly
Common causes of no or inadequate cabin heat include malfunctioning blend door(s) (part of the in-dash ventilation network), a faulty or stuck heater control valve, a plugged heater core, stuck open engine cooling thermostat, collapsed hoses, and low coolant level....
Question
My car is running hot and air not working.
Hi there - I suspect you have both a malfunction thermostat (still), or clogged cooling system which is causing the overheating issue. The lack of heater function could have 5 causes: the engine is not getting up to correct temperature...
Question
how to bypass heater core in 2006 dodge caravan
In order to bypass a heater core you will need to disconnect both hose connections at the heater core on the engine firewall and then connect the two hose ends together using a bypass pipe and two hose clamps then...
Question
I have a stutter when I am driving
The stutter, or vibration, could be due to an engine management (tuning) issue or is possibly caused by worn motor mounts that are allowing engine vibration to transfer to the body when the engine is under load. To evaluate the...
Question
Water hose leaking at firewall of 2012 ford focus
Typically, those are molded 5/8 inch ID rubber coolant hoses that are retained by either spring steel clamps or adjustable stainless steel worm drive clamps. Once you remove the hose, even to inspect it, it will not seal well when...
Question
Anti-freeze dripping in my floorboard, and fogging my windows even when heat is off
Hi there - your coolant leak inside the cab could be a leaky heater control valve - if this valve is inside the cab as well. Diagnosing this issue will require some "lying upside down" with your head up under...
Question
When at idle and accelerating, my 2006 Chevy Silverado 5.3 4x4 is making a humming sound 2006 Chevrolet Silverado
Hi there - although the actual heater control valve is vacuum operated, it is electronically (solenoid) controlled. It is possible the hum is from one of the HVAC control solenoids, or other parts of the coolant flow control. I would...
Question
2004 Toyota Highlander @147000 miles. Just had bolt problem on engine. Got it back after 1400 and now my heater is not working correctly.
Hi there. If your heater is not producing enough heat, then first check the coolant level and make sure that its full. If the level is full, then check the heater control valve and see if its working. Feel the...

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