Jeep Wrangler Blower Motor Not Working

Intense cold is popularly known as ‘biting cold’ for jeep wrangler blower motor not working. Extreme cold can get as threatening as biting air. If one has to leave their house on such a frigid winter morning, they usually expect to heat themselves up as soon as they reach their car. How disappointing would it be to find out that your Jeep Wrangler’s blower motor is not working. You would keep turning the knobs left and right to no avail. Then you would curse the weather, the car, the people at home, and the world for doing this to you in such cold. 

We are here to help you in a situation like this. If your Jeep’s heater has suddenly stalled or blows only cold air even after you have prayed to the dials, you must pay attention to what you can still do. There could be numerous reasons behind your Wrangler’s heater not working. It is important for you to figure out the root cause of the problem. For that, it is important to know how the heater of a Wrangler normally works.

Understand the normal functioning of a Wrangler’s heating system 

The hot air supplied by the blower motor of a Jeep Wrangler comes from the heat that is generated by its engine. So basically, your heater utilizes this accessory heat instead of dissipating it. As soon as your Jeep attains an optimal temperature, it’s thermostat opens and permits the coolant present in the cooling system to flow through the engine. 

This helps in removing the heat from the working engine and sending it towards the radiator. This heat is then supplied to the heater core which eventually directs it into the Jeep’s interiors. The failure of your heating system depicts a flaw in some part of this process. 

However, the whole process is not so simple. Numerous electronic devices are involved in the adequate functioning of your heater system. One or another portion could be defective or out of line. The newest Jeep Wrangler models have even more electronics involved so cannot judge what exactly may be the cause. It is best if you take your vehicle to a qualified mechanic for a proper diagnosis and dependable solution. 

Consider that the problem may be deeper than it may seem. However, it could be emanating from amongst these common areas. 

jeep wrangler blower motor not working

Check the heater blower motor and the resistor

A blower motor is responsible for blowing hot air that is supplied to the heater core. This hot air crosses the Jeep’s ventilation system and reaches the cabin to keep you warm. There is a glove box that consists of a fan. Any failure in the working of this fan could prove detrimental to the working of the blower. 

No matter what fan speed you set, an inefficient fan would make the whole blower system appear failed. You may also hear a disturbing grinding or rattling noise from the area of the fan. This noise could indicate an issue with the fan blade or its bearings. While this problem with the fan may not become evident in the summer months, it may become a big problem as soon as you get the first hit of cold air in the winter months. 

Also, a problem with the fan will not appear as long as you switch on the blower. This is because it doesn’t affect the functioning of any other essential component. And if you often drive your Jeep with the top down, the appearance of this issue will seem even more sudden.

However, the inefficiency of the fan does not define the failure of the blower motor. If there is no problem with the pressure and the fan seems to work well at certain speeds, there could be a problem with the resistor. When the resistor is failing, the air would only blow at certain set fan speed settings. 

Although, if the resistor completely fails, the flow of air through the vents may stop entirely. Also, the resistor does not extend any danger to the other surrounding components. But a replacement is surely needed to get the things back to normal.

Check the coolant level 

Insufficient coolant in your vehicle could also pose numerous problems. First, it would make the engine of your vehicle more hot. Also, it could keep your Jeep from generating sufficient heat for normal functioning. There wouldn’t be an adequate amount of coolant at the heater core so the blower motor wouldn’t be supplied with the hot air. 

This can be easily checked by examining the coolant overflow bottle. If the level of coolant in this bottle is low or it is empty, you can get it refilled with the specific antifreeze. If you own the latest Wrangler model, you would need the new OAT coolant. If your Wrangler model is older than 2012, you’d employ the HOAT coolant. 

The makers of Jeep don’t recommend mixing of the two coolants. You must ensure that the coolant you employ is a 50/50 blend with distilled water. Otherwise, you’d have to mix it yourself. You must never add concentrated coolant into your overflow bottle. 

Be careful to never add coolant to the overflow bottle on your own. Also, never remove the cap of the radiator while the engine is hot or under pressure or you could easily burn yourself. 

Check the thermostat

The thermostat of your Jeep helps in regulating the temperature of your engine. When your Jeep’s engine is cold, it stays closed. This blocks the flow of the coolant to the engine. As soon as the engine attains a requisite temperature, the valve opens and allows the flow of coolant to the radiator. This would cool off the engine and protect your Jeep from overheating. 

The problems arise when your valve begins to stick in a closed or an open position. If it becomes closed, your engine would quickly overheat. If it sticks in an open position, the engine will run at a lower temperature than normal. This would illuminate the check engine light. Your gas mileage also may be lost.

Although this is not a viable and immediate threat to your engine’s health, it may get worse with time and ruin the functionality of your Jeep’s heating system. One common indicator of thermostat failure is the sudden shooting up of engine temperature when starting driving. 

Check the heat core and the hoses 

The coolant inside your Wrangler’s engine is carried through heater hoses. They come in pairs of inlet and outlet. A defective hose can result in a leakage of the coolant. You’d even be able to smell the coolant in the bay of the engine. If this coolant falls upon the heater core, it could even intrude into the cabin. 

The defect in the hose could occur because of a tear or it could have rotten with time. However, it is important to check the intactness of these hoses even if your engine bay does not emit a coolant smell. When the engine is warm, these hoses should also be warm. If this is not the case, the coolant may not be circulating properly. There could be air within the lines or your heater core could be clogged. 

A problem in your Jeep’s heating system usually indicated the need for some replacement 

Depending on where the problem lies exactly, you would need an adequate replacement. There could be an issue with the heater blower motor, the heater control valve, the heater core, and even the heater hose or thermostat. 

Heater blower motor replacement 

If the blower motor of your heater fails,the air conditioner and the heater of your vehicle may continue to work properly and the hot or cold air may be felt at the vents. However, the air pressure will be drastically reduced. This problem could also be indicated by a rattling or grinding noise emitted from the passenger floorboard. 

Heater control valve replacement 

A failure of the heater control valve would be indicated by little change in the temperature of the air at the vents upon adjustment. It is also possible for the valve to leak engine coolant and cause much overheating of the vehicle. 

Heater hose replacement 

A rotting heater hose may be spotted by a peculiar coolant smell emanating from under the hood. This smell may even be sensed within your cabin. This problem could cause severe engine overheating and even result in cylinder head gasket failure. 

Heater core replacement 

The failure of a heater core will also cause the car’s interiors to smell like coolant. This smell would only worsen when you turn the heater on. Rapid engine overheating could cause severe damage.

Thermostat replacement 

An open thermostat would make the engine run slow and colder. This could reduce your fuel mileage. A closed thermostat could cause severe overheating.

Conclusion – jeep wrangler blower motor not working

The failure of your Jeep Wrangler’s heating system requires immediate attention. Take your Jeep to a mechanic immediately and get done with the required replacements.

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