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Q: Do air pockets in a cooling system make the heater not work?
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How do you flush the heater system in a 1990 Thunderbird?

put cooling system flush in the radiator and follow the directions but make sure the heater is on while you do will clean both your cooling and heating systems.

What causes heater not to get hot in 1999 gmc truck?

air pockets in the cooling system, start by bleeding the lines, plus there is a bypass for the heater core when you have the a/c turned on, or your heater isn't on, this fluctuate between makes and models. but i would go to youtube and look up how to bleed coolant lines, and that should make it easy for you.

Heater problems 2000 GMC sonoma 4.3 vortec?

If all the inside controls are working and you have antifreeze in the cooling system them I would suggest that you check and make sure that the thermostat is working and after that check to see if the heater core is stopped up. If so then you will need to completely flush out the cooling system including the radiator, block, all hoses and the heater core.........

What could cause air in the cooling system of a 2002 Mustang 65K symptoms: Intermittent Heater and fluctuating engine temp when no heater?

Make sure the coolant level is up. If that's not the problem, replace the thermostat.

Second time on replacing your 1995 Sunfire heater coil Anyone have this problem or know of a recall for this problem?

Heater coil? Or do you mean the heater core? If it's the core, the problem might be due to rust in the cooling system. This is usually because someone just filled or topped off the system with plain water instead of a 50/50 mix of water/antifreeze. I'd have the whole cooling system flushed before replacing another heater core, and make sure the proper mix of water/antifreeze is used to refill the system.

Problem with heater 1997 ford ganger?

Check for any blockage or buildup in the hoses to and from the heater core itself. Also check to make sure the thermostat is working properly. A cooling system flush may also be needed.

What is a back flush on the cooling system?

Back flushing on a cooling system is when you get all of the trapped air out of your cars cooling system. This will make your vehicle run better after you do it.

How do you remove an air pocket from a cooling system on a 1998 cord crown Victoria?

You can bleed the cooling system from the heater lines at the firewall. Before you start the engine, loosen one of the heater lines, then replace it without the clamp. Start the engine and when it reach's operating temp. slowly open that heater hose slightly. Coolant and air will then come out. Be careful of the fumes because the coolant will drop on the exhaust. Make sure the heater inside the car is on max. Bleed the system till all the air is out and you get hot air inside. Refill the rad.

03 f250 desel heater is hot and cold every 30 seconds?

Check thermostat, if that's ok make sure the system is full of coolant. If you have recently changed a cooling system part (water pump, thermostat, heater core, etc.) then you may have an air pocket in the system which will make you think it is full of coolant but actually is not, thus intermitten heat. Hope this helps.

Why does my 2002 Mazda 626 Engine overheats returns to normal when you blast the heat?

Running your heater allows more cooling time for the water in the system. Check your water or coolant level to make sure you have plenty of water in the system.

I replaced the thermostat in my daughters 2000 passat and took it and had a coolant flush done and it still throws cold air. The mechanic told me the problem is coming from under the dash?

check the heater core to see if it is clogged make sure it flows well - volkswagons are common for having air when replacing cooling parts- volkswagons have special bleed procedure to bleed air out of cooling system- make sure water is flowing in and out of the heater core properly- the thermostat will not open to allow water to flow if there is air in the cooling system and then in tern will not flow through the heater core to allow you to feel warm air flow into the cabin

What would make the engine overheat?

Blockage in the cooling system No or little fluid in the cooling system Radiator fan not working