Question about 2006 Mercedes-Benz Mercedes Benz CLS500

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My heater comes on but only blows cald air - 2006 Mercedes-Benz Mercedes Benz CLS500

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Sounds like you have ablooked heater core. start up the car let it warm up check your heater hoses both of them should be hot if not you have a blockage . take both hoses off and back flush them

Posted on Oct 12, 2013

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Posted on Jan 02, 2017

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I already changed the thermostat on my 2002 Jeep Cherokee and the heat actually seemed like it was working but now it is not blowing any heat at all. What could be the problem?


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If the heater core is clogged, you'll need to blow it free. Follow the two heater core hoses from the firewall out to the engine. Disconnect them both, put one in a bucket, and use the blowgun attachment for an air compressor to blow into the other one. Then swap - put the one you blew into, in the bucket, and blow into the one that was in the bucket the first time. Reconnect the heater core hoses, and burp the system (again, follow the Tip instructions for that). Usually that will take care of it.

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I have a 2002 Ford Mustang. My air conditioner is not working properly. It blows into the defrost when I take off and when I let off and go a steady speed it blows out cold. It blows hot air sitting at...


if it never comes out face vents then u have a door actuator motor not working ,,if it jumps around letting off throttle then it is a vacuum problem vacuum under hood going into the firewall needs to be checked,,and vacuum resovoir might have hole in it if it is vacuum cantrol,,,the reason for warm and cald temp changes is probley not enough air flow threw radiator and condenser this will rise the high side and low side heating up the freon and it cant cool the freon down enogh to get col air ,electic fan not coming on would cause this or fan clutch (if it has one ) would also cause this .look for fan relay not working ,also did u change accumilator and dryer? ,also may have blockage in condenser i hope i shed some light on the problem

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Heater doesn't blow hot air


First check the coolant level in the radiator. Check your heater core hoses on the firewall underneath the hood. Let the car come up to temp. and feel the two hoses. If only one of them is getting hot you may have bad heater core or a bad heater control valve.

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A/c unit


you have a vacum hose that could be off or listen for a hissen noise

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