Question about Cars & Trucks
Have replace thermostat but heater only warm
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Posted on Jan 02, 2017
Check the water control valve behind the engine close to the firewall. This valve opens and closes to allow hot coolant to enter the heater core. It is usually connected to the heater controls with a cable. When you adjust the heater control for heat, a cable activated lever on the valve should move and allow coolant to move through the valve. The cable from the heater control can come loose from the lever, or the valve itself can become corroded and hard to move.
Posted on Oct 16, 2009
SOURCE: ONLY WARM AIR FROM HEATER,
The next possibility, if you haven't already thiught of it, is as simple as making sure there is enough water/antifreeze solution in your radiator. If the level is too low, your hoses will get hot, but there will not be enought water to circulate into your heater core.
Posted on Dec 18, 2010
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