I Replaced Thermostat Now No Heat In Car, What To Do?

The thermostat isolates the engine from the radiator until it has reached a certain minimum temperature. Without a thermostat, the engine would always lose heat to the radiator and take longer to warm up. What if you have just bought a new and replaced thermostat now no heat in the car in such cool weather it will be very difficult for you to survive in such frosty weather.

I hope you don’t want to freeze like ice cream in the winter season. Now, there is no need to worry we’ll be discussing this problem in detail. By which you’ll get some idea of how to deal with this problem in such situations.

Why There Is A Need For Thermostat In The Car?

The Thermostat Valve is responsible for moderating the temperature of a vehicle’s engine. While many of us are aware of the potential perils of an engine overheating, an engine also will not work properly when it is too cold. Therefore, it is the job of the thermostat to regulate the temperature between these extremes, creating a happy medium that promotes optimum driving by controlling the flow of coolant that can circulate through the engine.

The thermostat has 2 positions that are open and closed. When the valve is in the open position, coolant is able to flow through it, which lowers the engine’s temperature. When the valve closes, it blocks the entry of fresh coolant into the engine, allowing it to warm up. This part works alongside your vehicle’s radiator.

When the coolant has become too warm, it passes it back to the radiator, which works to return it to a suitable temperature. The thermostat valve allows coolant to circulate and keeps the engine cool. The thermostat keeps the engine at its optimum temperature, meaning the parts of your engine system can work to the best of their ability and will last longer, all while giving you the best drive possible in the process. In short, without your vehicle’s thermostat, your engine is at risk of running too hot and overheating or running too cold and shutting down.

What Are The Functions Of The Thermostat:-

The thermostat is one of the important components in the car cooling system. It is located inside the water line that goes from the engine to the radiator. Its main function is to regulate the circulation of engine cooling from the radiator to prevent overheating of the engine. While the engine cooling system functions so that the temperature inside the engine remains at an ideal condition.

The ideal temperature conditions for the engine are in the range of 80-92 degrees Celsius because at this temperature the combustion process in the engine will be optimal, hence engine power works at its best, and fuel consumption is efficient.

What Are The Types Of The Thermostat:-

The car thermostat is divided into two, namely without a bypass valve and with a bypass valve.

1. Thermostat Without Bypass Valve:-

This type of thermostat is usually used in old cars, it is very rare for new cars to still use this type. This thermostat can be found on the radiator inlet which is still not equipped with a spare line. That can make cooling water flow when there is a malfunction in the thermostat. Water will be trapped in the radiator and water jacket when the car engine is cold. This type of thermostat is cheap. However, there are some drawbacks as well. In the event of a malfunction, a thermostat without a bypass valve has no safety line. In addition, there are no water lines that will cool down when the car engine is at high temperatures.

2. Thermostat With Bypass Valve:-

Thermostats with bypass valves are common in the latest cars. This type of thermostat can be found at the radiator outlet and has a bypass valve that is integrated into the thermostat. In this type, the water coolant cannot circulate in the radiator but will flow from the water jacket to the thermostat which will enter the water pump and be pumped back to the water jacket. There is a safety line when there is damage and can immediately cool the hot engine temperature because it has a bypass valve. Meanwhile, the drawback is the price is fairly expensive because it has a fairly complicated construction.

Reasons For Replaced Thermostat Now No Heat In The Car?

This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core is a small radiator-like unit that circulates the hot coolant from the engine through the heater core. Which then uses this warm coolant to heat the inside of the car with the help of the blower motor.

That blows the warm air through the vents inside the car. When the cooling system is not properly circulating coolant through the motor, this results in the warm coolant not being pumped through the heater core properly in order to warm the inside of the vehicle.

Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know, the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds.

Here's Why Your Car Has No Heat - BestRide

1. Faulty Heater Blower Motor:-

The most common symptom of a bad blower motor resistor is that the blower motor will only work at one or two speeds. It can also cause the blower motor to stop working completely and you will notice no air coming from the vents. Here are the most common symptoms of a bad blower motor resistor.

1. Only one speed from the blower motor

2. Various airflow settings not working

3. No air coming from vents

2. Bad Heater Core:-

The core is what warms the air when you turn up the temperature. It also keeps the defroster’s air warm so it can keep your windshield and your visibility clear; well, as clear as possible depending on the weather conditions outside. Stringer Auto Repair can inspect your core to make sure it’s okay. Here are five signs it isn’t.

1. Fog inside your car

2. Sweet smells in the car

3. Constant engine coolant loss

4. Cold air in the cabin

3. Low Coolant Levels:-

When coolant is low, your engine will start to heat up. The feature will automatically shut off the engine to prevent damaging the engine. Once your engine cools down, you will be able to drive your car again. The following symptoms of this problem are.

1. Rising temperature gauge

2. Sweet odor (the smell of antifreeze)

3. Problems with your car’s heater

4. Increase in fuel consumption.

4. Failing Coolant Fan Switch:-

The coolant fan will continue to run until the engine temperature cools down to a specific predetermined level. Once the temperature reaches this cooling stage, the coolant fan will shut off. Although the coolant fan switch is very small and sometimes overlooked, it is an incredibly important component of your car’s cooling system. Think of this switch as the “gatekeeper” to the temperature regulation in your vehicle’s engine. There are many other engine systems that are also indirectly affected by the operation of this switch. Several symptoms may point to a bad or failing of the thermostat coolant fan switch.

1. Check engine light comes on

2. Engine overheating

3. Broken or shorter signal wire

How To Deal With The Issue Of No Heat In The Car?

Even if you’re missing a little coolant from the system, the engine can still run at the correct operating temperature. The first thing to be affected will be the heater core since it is higher than the engine, there might not be enough coolant to reach it. There is a need to check the following.

Functions of the Thermostat Valve in a Car

1. Check your owner’s manual to find out the problem with your radiator. You’ll need to remove the cap of the radiator to check that the fluid is topped up.

2. Go for a ride until the engine heats up and the dial is between C and H. You should have heat in the car. If not, it’s usually because the water pump isn’t working.

3. There could be a blockage or other problem which is stopping heated antifreeze from moving through the heater core component.

4. A valve or switch could be faulty, or the heater core could be clogged. There is a need for a replacement for it.

5. Wait until the engine has cooled down and check the coolant level, topping it up if needed.

Hence, these are some hacks for the replaced thermostat now no heat in car issue.


We hope the above-mentioned information about the replaced thermostat now no heat in the car will be helpful to all the readers. If anybody’s doubts persist feel free to comment in the comment section below. We’ll definitely try to solve your doubts as soon as possible.

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