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heater control valve

The lines to the firewall could be hot and yet the heater control valve (https://www.yourmechanic.com/services/heater-control-valve-replacement) 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...

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...

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...

Your car has a heater control valve to control the flow of coolant through the heater core. It is controlled via engine vacuum so that in the case of a failure, it will default to the heat (open) position. Your...

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...

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 (https://www.yourmechanic.com/services/heater-control-valve-replacement), a plugged heater core, stuck open engine cooling thermostat, collapsed hoses, and low coolant...

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 (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-thermostat) - not likely in your case since the temp gauge...

Hello...the simplest option is to just request an engine overheating diagnostic (https://www.yourmechanic.com/services/car-is-overheating-inspection) 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...

The heater control valve (https://www.yourmechanic.com/services/heater-control-valve-replacement) 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...

Hello. The symptoms you describe are commonly associated with air bubbles in the cooling system. If the cooling system was recently serviced then it may be possible that it needs to be properly bled of air bubbles. Air trapped in...

This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core (https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the...

The first thing to confirm is whether or not the engine operating temperature is in the normal range and whether there is sufficient coolant in the radiator. If, for example, the engine cooling system thermostat is stuck open, and thus...

You need to feel both heater hoses coming from engine to heater core on firewall to see if they are hot? If not hot then engine thermostat is stuck open. If they are hot then you may have a bad...

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...

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...

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 (https://www.yourmechanic.com/services/heater-control-valve-replacement), a plugged heater core, collapsed hoses, and low coolant level. The cost to resolve the problem...

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...

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,...

Hello - you may have a bad water pump (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-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...

Hi - most likely, either the heater control valve (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-heater-control-valve) is not functioning properly, or the heater core itself is clogged enough to restrict flow. I would recommend a heater inspection (https://www.yourmechanic.com/services/heater-is-not-working-inspection) by a mobile, professional mechanic, such as one...