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Posted on Jan 02, 2017
That hose is the drain hose for the air conditioner evaporator. If it is leaking coolant, there's a good chance that your heater core is leaking, as it is in the same 'box' that the air conditioner evaporator is in. You'll need to replace the heater core.
Posted on Apr 24, 2009
You need to put pressure on the coolant system and look for the leak. If you are lucky you can find the coolant leak by following the coolant trail. It could be a head gasket, intake gasket, or coolant sensor near where you say, but take a good look to try to round it down.
Posted on Sep 19, 2009
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Jun 24, 2014 | 2005 Chevrolet Cavalier
Follow the lower radiator hose to where it meets the thermostat housing. The thermostat housing is where the opposite end of the lower radiator hose mounts to the engine.
Drain enough coolant from radiator until it is below the thermostat. Failure to do this will result in your antifreeze leaking out onto the ground.
Loosen clamp and remove radiator hose from thermostat housing. Some antifreeze will leak out, so have some rags available.
Remove the bolts holding the thermostat housing on and pull the housing from the engine. The gasket might make it a little difficult, so do not be afraid to pull hard. Do not strike it with any tools as you can crack it.
Remove the old thermostat and note its alignment.
Place a rag in the thermostat's mounting hole so no gasket material can enter the engine and then scrape the gasket from the housing and the engine.
Install the new thermostat in same position as old one.
Reinstall the housing and tighten down bolts snugly. Torque them with your torque wrench to 10 ft.-lbs. Make sure you do not over-tighten them.
Reinstall the radiator hose to thermostat housing and tighten the clamp.
Refill the radiator with coolant and start the engine, allowing it to reach normal operating temperature.
Check for any leaks at hose connection and thermostat housing. You can tighten them as necessary to stop any leaks.
Stop the engine and allow it to cool down completely then check the coolant level. Add coolant as required.
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