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Hi,

Before you think about having to replace the thermostat, you should check the fluid level of the cooling system at the radiator cap. The coolant level needs to be absolutely full, right up to the bottom of the neck of the radiator. If it is not, fill it up there and also make sure that the overflow bottle is at least half full at all times. Keep checking it every day for a few days after you have filled the cooling system, as it will go up and down as the engine warms up and cools off.

What sometimes happens is that the coolant gets low and there is not enough to flow through the heater core. Other things to consider is a blocked heater core, or a trapped air bubble in the system. This would mean that you need to bleed the system of any air to get that bubble out.

Good Luck, Greg

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Q: If you have no heat in your 2000 Chevy Van is it the thermostat for the radiator that you need to replace?
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