How to know if your radiator hoses are hot or cold?

Start the car from cold, run the engine for 10 minutes or so and check that one hoses is warm and the other cold. That indicates the stat is closed as it should be, so far so good. Now drive the vehicle until normal operating temperature is reached. Shut off the engine and check both hoses, they should now both be warm.

Why are the hoses to the heater core cold?

But it sounds like a bunged up heater core…..or a massive air pocket blocking coolant flow into the heater core. With the engine cold and you’ve got reasonable access to safely disconnect your heater core hoses one at a time, disconnect one or the other and have a friend start the engine.

What should the thermostat be on a hot car?

The thermostat starts to open right at 180* and is fully open at around 200*. After the engine has warmed up (as warm as it is going to get), the upper radiator hose is hot, the heater core hoses are hot, the little bypass hose is hot, the lower radiator hose is cold/barely warm. Coolant level is fine.

What is the temperature of an AC motor alone?

・ Load condition: No external forced cooling (no air ﬂow or cooling by an external fan). Motor alone (there is no gear head or heat sink) The 120° C (130° C) on the vertical axis of the graph is the heat resistant class line of Class E (Class B). Indicates the allowable winding temperature of the motor.

When to run hot or cold radiator hoses?

Both should be hot if circulation is occurring and the water pump should be circulating the water unless the engine is not running, but possibly not through the radiator or does not reach operating temperature.

What does it mean when your car coolant hose is cold?

The engine needs to be really hot and almost overheat before the thermostat lets the coolant pass by. If your car is not overheating, but the lower coolant hose is cold when you feel it – it may just mean that it is not hot enough, and therefore there is nothing wrong with your engine.

What does it mean when your Radiator is running cold?

This indicates that your radiator is operating correctly: it is successfully cooling the hot coolant which is leaving the engine via the upper radiator hose. The thermostat controls how much of this cold coolant is brought into the engine from the radiator, via the lower radiator hose.

Why is my lower radiator hose not running?

If your car is overheating and at the same time won’t heat the lower coolant hose – You most likely have a problem with your thermostat, which needs to get replaced. The thermostat should be closed when the engine is cold and not running.

What happens if one of the radiator hoses collapses?

If they are not replaced when necessary, they can completely collapse, causing the engine to overheat and unable to run. In extreme cases, a collapsed hose can cause the engine to burst. This article covers how to check radiator hoses, which may help you keep your engine from overheating. Find both of your radiator hoses.

Where is the coolant cap on a Silverado?

Open the hood to access the engine compartment. Locate the radiator in front of the engine compartment. Twist the radiator cap counterclockwise to remove it from the radiator. Once the cap is off, check the coolant level. The coolant should be visible by looking down in the radiator.

When is the top of the radiator supposed to be hot?

Either-way, the top hose gets hot after the thermostat has opened. The time the thermostat takes to open depends upon factors such as: In this post you’ll learn how the coolant system works, when the top hose should get hot and what you should do if it doesn’t. The coolant system after the oil system is the next most critical system.

What should I do if my truck heater is not working?

This can lead to clogs or loose clamps. If you’re struggling to find a coolant leak, these hoses should be one of the places you check. You should always replace old coolant hoses, along with any other hoses, when you notice any wear or leaks. How Much Does It Cost to Repair My Truck’s Heater?

How is a cabin heater similar to a radiator?

Cabin heater core – The Core is not unlike a radiator, it’s used to transfer engine heat to the cabin. The heater fan blows air across the core to demist the windshield and/or warn occupants. Thermostat – Used to regulate coolant flow around the engine. The stat remains closed until about 180 deg F, this helps the engine warm up quickly.

Is the upper radiator hose hot or cold?

Upper radiator hose is hot, lower is cold. The coolant is close to full. The degas bottle when filled to the max line will puke coolant when I rev the engine and let off. I used a block tester to check for combustion gas especially in the coolant system and the liquid stayed blue. Any ideas? It’s about 35°-40° here.

Why is the lower radiator hot and the upper coolant cold?

I just replaced a leaking lower radiator hose a week and a half ago and did a full flush. I also hooked the hose up to the heater core and ran water both directions. Water flowed freely. Both hoses to and from the heater core are hot. Upper radiator hose is hot, lower is cold. The coolant is close to full.

What should the temperature of the radiator be?

Using a pot of warm water, dunk the stat into the water and heat it slowly, a kitchen thermometer is useful to measure the the opening but a visual works too. Bringing the pot off the heat will cause the stat to slowly close. This is normal function, but the temperature it opens at is important.