Does coolant flow through heater core when heater is off?

If the system is not equipped with a heater control valve, coolant will circulate through the heater core when the heater is turned off. The easy way to tell if coolant is circulating through the heater core is to warm up the engine with the heater turned off and the temperature set to the coolest setting.

Which way does coolant flow in a Duramax?

Coolant travels from the water pump to the engine oil cooler, into the aluminum bellhousing adapter, into both cylinder banks at the back of the engine, then up into the heads, then to the thermostat housing. Duramax Diesel Service Guide – New for 2022!

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Which way does coolant circulate?

Expert Reply: The coolant in your vehicle will flow from the engine into the radiator via a hose at the top of the radiator, and then out from the bottom of the radiator into the water pump.

Does coolant flow through heater core when heater is off? – Related Questions

What direction does engine coolant flow?

Usually the pump sends coolant up through the engine and down through the radiator, taking advantage of the fact that hot water expands, becomes lighter and rises above cool water when heated. Its natural tendency is to flow upwards, and the pump assists circulation.

Does coolant flow into or out of thermostat?

The thermostat opens to allow access to the radiator. Before the thermostat opens, there is a bypass that sends the coolant back through the engine. The water pump circulates coolant around the engine until the temperature rises enough to open the thermostat, at which point the radiator begins to cool it.

Why does a Duramax have two thermostats?

If the engine is put under load, the secondary thermostat, which has a higher open temperature rating, now allows full flow to the radiator. If the coolant temperature drops too much, then the secondary thermostat begins to close, limiting flow.

Which way does the thermostat face in a motor?

Which way does the hole go thermostat?

The thermostat jiggle pin is a pin that is located in the small hole in the plate valve of the thermostat and which should always be in 12 o’clock position during installation. It helps bleed the cooling system of trapped air by allowing air to pass into the radiator, after which it can be released from the system.

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Can a thermostat be wired wrong?

It only takes one wire that is incorrectly installed to not allow the system to work properly. This could cause high electricity costs, an uncomfortable temperature in the building, or the system to not work at all.

Can you put a thermostat in the wrong way?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

When installing the thermostat What is the correct position of thermostat?

The best place for your thermostat is on an interior wall, away from all the areas we previously discussed (direct sunlight, air vents, your kitchen, hallways, windows and doors). Ideally, it should be placed toward the center of your home.

Where should you not install a thermostat?

When installing your thermostat, the main thing you want to avoid is placing it in an area with extreme temperatures. For example, don’t place it above air vents, near windows and doors, or in any spot that receives direct sunlight.

What are some of the common mistakes when installing a thermostat?

8 Mistakes People Make With Their Programmable Thermostat

Is it better to raise and lower thermostat?

If you don’t have a programmable thermostat, you should adjust it during the night and when you’re not going to be home. Turn it down during the winter nights and up a little during the summer. This will reduce how much your furnace and air conditioner work when you don’t need them.

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What is the healthiest thermostat setting?

What temperature should you keep your house at? Or better yet, “What is the most energy saving temperature to set my thermostat at?” According to, the ideal home temperature should be between 70 to 78 degrees Fahrenheit.

What is the most comfortable thermostat setting?

Considering most folks do their best sleeping between 60 and 70 degrees, it’s possible to save money without losing sleep. During the summer, a daytime temperature setting of around 78°F should keep you comfortable without excessive energy consumption.

Is a hotter or colder thermostat better?

A hotter thermostat will tend to make an engine more efficient from a fuel mileage and emissions standpoint. It might also reduce horsepower by a few percent and, if the thermostat temperature is higher than the factory recommends for the specific vehicle, it might cause internal engine parts to wear at a quicker rate.

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