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Dealing with my wife’s 2007 525i at the moment. Over the past few months, we had experienced a number of issues that were hopefully unrelated. Crankshaft position sensor (CPS) and transmission fluid were just replaced; before to replacement, the CPS had generated more than 8 error codes.
However, the heater hasn’t produced any hot air since then. Since it has been summer, I can’t state with certainty that they happened at the same time. I have disassembled the heater control valve, examined the fuses, and the coolant level. The car warms up as usual. The air conditioning system (cold) runs smoothly. No obvious ducting problems. There is uneven heat throughout.
My main concern is testing to see if the heater control valve is working normally: If I’m wrong, please correct me, but the upper-top line that leaves the heater control valve and travels to the heater core ought to be just as hot as the other coolant hoses, right?
This hose is warm but not hot following warm-up or driving. I turned off the control valve to stop the solenoid from turning on and closing off the heater core, but the issue is still there.
Can coolant enter the heater core if the heater control valve is disconnected and left open?
Could coolant flow through the heater control valve still occur in a confined heater core? If so, where is the heater core’s outlet?
In the past few years, Bimmerfest has been a huge assistance to me with our old E46, this E60, and our F30. I’m hoping some advice from this community can help me decide whether to just replace the heater control valve completely or focus on other sensors first, like the engine thermostat and interior temperature sensor, for example.
In This Article...
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Until you develop a strong attraction to Beagles or another small dog, read cooling posts. When you write a sweet note to this dog and send it along with a tasty can of dog food, you’ll know you’re bleeding.
The thermometer may show a normal temperature, but there could be a leak in your system or a faulty therm. See if the temperature needle falls below dead center after ten minutes of driving on the freeway. Additionally, turn on the heater while driving, three red dots (!!! ), and check the coolant level later, once the engine has cooled down. To find the stick’s minimum and maximum, add.
Set the heater to the warmest setting after bringing the engine up to working temperature.
How is a heating control valve tested?
- Set the heater to the warmest level once the engine has reached operating temperature.
- Check the valve’s outlet hose’s temperature, which should be almost as hot as the valve’s inlet hose (between the valve and the heater core).
How can you tell if the heater control valve is malfunctioning?
- No heat is emanating.
- Heat that is perpetually on and uncontrollable.
- Despite without changing the heat setting, heat output changes.
- The thermometer reads hot.
- Low level of coolant.
- fluid leak
A heating control valve is operated by what?
The pace at which coolant flows through the heater core is managed by the heater control valve, also known as the hot water valve. The heater’s intake hose is where the valve is positioned. Systems that are manually operated may turn the valve with a cable, a vacuum motor, or an electric solenoid.
A push-pull cable links the cable-controlled valve to the dash board heat selector. A vacuum controlled valve responds to the operator’s choices by moving in reaction to engine vacuum. Electrically powered valves are controlled by a solenoid and a wiring system.
The control valve for automatic temperature control systems is managed by the computer and can be powered by vacuum or electricity. The computer will manage the valve to maintain the desired temperature in the car once it has been chosen. Make sure that your mobile A/C system is repaired correctly and with high-quality replacement parts by hiring a professional to do the job. To ensure that refrigerant may be reused and not released into the atmosphere, insist on recovery and recycling.
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What occurs if the heater control valve malfunctions?
An unresponsive heater is one of the initial signs of an issue with a heater hose control valve or any of its related parts. The heater will not be able to function if the heater control valve malfunctions or becomes stuck, blocking the flow of hot coolant into the heater core. The front defroster might not function if the heater does not have hot coolant, and the AC system won’t be able to blast hot air.
Are heating control valves necessary?
Heater is inoperative. The coolant supply to the heater core may be limited or halted if the heater control valve malfunctions or becomes blocked. The heater won’t be able to generate warm air for the cabin without coolant flow to the heater core.
Will an ineffective heater control valve result in overheating?
The main danger from a faulty heater control valve is the potential for enough coolant to seep out to cause your engine to overheat, even though a lack of interior heat from the heater is a serious enough issue.
Can the heater control valve be bypassed?
Vehicles do not come with heater control valve bypass as normal; it requires a modification. When bypass pipes are placed, your car’s coolant will constantly circulate through the heater core, making it impossible for you to turn off the heater if the core begins to leak.
What would occur if the heater control valve became stuck shut?
Stuck Heater Control Valve Some cars have a heater control valve that only opens when the heater control specifies hot air, allowing hot coolant to pass through the heater core. If the control valve is detached from the heater control, leaks, or is jammed closed, the heater will not be able to produce warm air.
Why does my BMW not blow heat but cold air?
Your vehicle’s heater controllers may be malfunctioning if chilly air is blowing out of your vents. These dials and buttons frequently break and become clogged over time from heavy use, making it difficult for them to deliver signals to your car’s heating system. Fortunately, there is a quick cure for this.
How can I tell if my heater core or thermostat is malfunctioning?
- Within Your Car, the Fog If you have fog inside your car, two things can be happening.
- Sweet aromas in the vehicle. Your perfume or the donuts you brought to work might not be the source of the delicious smell in your car.
- Constant Coolant Loss in the Engine.
- The cabin has cold air.
- Hot Engine/Cold Cabin
What does a control module for a heater do?
The HVAC system in your automobile is managed and controlled by a computer called the AC/heat control module. The module may occasionally malfunction and most likely generate a fault code. The technician will read the trouble code when you bring your automobile in to be fixed in order to properly diagnose the HVAC system problem.
Why isn’t my car’s heater pumping hot air?
- Low coolant: The most frequent cause of subpar heater performance, whether brought on by a leak or water evaporation.
- The engine (and coolant) cannot heat up if the thermostat is stuck open.
- Coolant flow is restricted by a blocked heater core, which produces little to no heat.
- Electric cooling fans: When they run continuously, electric cooling fans stop the coolant (and the engine) from reaching operational temperature. This is the result of a malfunctioning sensor, switch, or controller.
- Some automobiles include a heater (hot water) control valve that only activates when the temperature is adjusted to hot. The heater core cannot receive the hot coolant it needs because of a stuck-closed valve.
- Blend doors: Heated air cannot reach the passenger compartment if the temperature control, the blend door, or the actuator for the blend door is malfunctioning or out of calibration.
There can be another explanation if your car has recently undergone maintenance. Air bubbles may have entered your cooling system if you had the fluids topped off, the radiator cleansed with fresh coolant, or if your radiator cap is broken. Coolant cannot circulate through the cooling system, including the heater core, because of air bubbles.
Here’s how to repair the air bubble issue on your own and have your heater up and running once again. Don’t laugh: Your cooling system needs to be burped, just like a baby.
What does a sensor for a heater core do?
Built to last, function electrically, and deliver accurate readings that are combined with signals from the cabin temperature, solar load, and ambient air temperature sensors to govern heater and fan operation.
How can I heat my automobile in the absence of heat?
Even though the heating in your car might not be working, you are not absolutely helpless. When plugged into your car’s interior power socket, a small 12V heater or heated seat cover can provide some much-needed comfort while you’re driving. Heated seat covers are available on Amazon for under $20, which is a little fee to pay for the luxury of complete body warming.
How is an automobile thermostat de-sticked?
Make sure the mounting surfaces are both clean before reinstalling a thermostat. As you drive, these regions frequently become oily or filthy.
These surfaces can interfere with one another, allowing coolant to leak or moisture to enter the thermostat housing. Rust will result from this, which will cause your thermostat to jam once more.
With the past, I’ve cleaned both surfaces using a razor blade, followed by a shop towel soaked in Simple Green. For quicker results, you can alternatively use a small angle grinder with a thick pad on it.
Make sure you’re not cutting open any surrounding wires or tubes while performing this cleaning procedure. Be cautious and proceed cautiously because doing this will cause significant issues in the future.
When the heater is turned off, does coolant travel through the core?
The cooling system of a car includes the heater core. It has the appearance and functionality of a smaller radiator and radiates heat into the cabin by moving coolant via the tiny tubes. It is connected to the air conditioning system, which is built on similar principles, and is in charge of enabling the defroster to operate correctly.
The antifreeze/coolant in an automobile engine absorbs heat as it warms up and circulates around the engine and through the radiator to cool it below the boiling point. The thermostat regulates the temperature of the entire system. When the heat in your automobile is turned on, air is blown over the heater core, where it is warmed before entering the cabin. Some cars include a heater valve that, when the heat is on, sends coolant through the heater core and, when the heat is off, bypasses the heater core. In some vehicles, the amount of air forced over the heater core determines how hot the air is inside the air blend box.
With dual zone climate control systems, the driver and front-seat passenger can independently manage the cabin’s temperature thanks to a split heater core. Some large SUVs and high-end luxury vehicles have an additional heater core that enables the rear passengers to control their own temperature.
The surfaces inside the cooling system, especially the heater core, are protected from corrosion by corrosion inhibitors included in coolant/antifreeze. The cooling system may get corroded, contaminated, and even begin to leak if the corrosion inhibitors run out. When coolant or antifreeze leaks from the heater core, the system’s overall coolant level will be low, putting the engine at risk of overheating, which is the most common reason for mechanical failure. Because it can no longer measure the temperature of the now-empty water pipes, the warning light or temperature gauge may not even indicate a problem in the absence of coolant. Therefore, it’s crucial to be aware of the five indications of a leaky heater core.