Question about 2000 GMC Jimmy

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When I turn on the heater only cold air comes out

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Is the heater tap being opened by the cable?probably not look under hood and get someone to turn on and off the heater to see,unlikley,heater core blocked

Posted on Oct 28, 2009

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: Car Heater blowing out cold air regardless of temp setting

you could just be low onwater

Posted on Dec 20, 2008

Anonymous

  • 239 Answers

SOURCE: Heater blowing cold air.

replace thermostat its clugged,and only allows very little water to go through

Posted on Jan 03, 2009

Anonymous

  • 2 Answers

SOURCE: 04 gmc yukon heater air cold passanger side.

If this happens when you are idle, and then you get hot air as you drive, most likely you have low coolant and it only cycles as you drive. Get approved dextrom gmc coolat and cap off your coolant it is most likely low.

Posted on Jan 21, 2010

SOURCE: My heater air cold when turn my heater

have your heater core checked out

Posted on Dec 10, 2011

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1 Answer

2000 caddy Seville ...after starting and engine warm turn on the heater and it blows cold air. Fan works / waiting for hot air and then all the sudden it kicks in. Engine at normal temp


Low coolant, if there is an air pocket in the engine it will make it to the heater core. Once there , the air coming out is cold/cool. Once the coolant fills the heater core, it gets hot. If the coolant is fine hot or cold, then have the HVAC system scanned.

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replace thermostat before you do anything else.. If it is stuck open there will be not heat

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have your heater core checked out

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If this happens when you are idle, and then you get hot air as you drive, most likely you have low coolant and it only cycles as you drive. Get approved dextrom gmc coolat and cap off your coolant it is most likely low.

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Hi there,

Well If you can turn on the heater but only cold air comes out you should check the blend door. It controls the door to switch from cold air to hot. It sits directly behind the heater/AC controls. It is white square plastic piece (approx 3in x 5in half inch thick and has a plastic screw rod that attaches to the heater/AC controls and they strip out

Good Luck!!

Thanks

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1 Answer

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It sounds like you have air trapped in the cooling system. Try filling the radiator and coolant reservoir cold. Then leave the radiator cap loose and run engine at 1500 rpm until it warms up and the thermostat opens. Make sure heater is on full warm setting.

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I take it the water level in the expansion tank is ok. You could have a blocked core in the heater. Also the heater could be leaking. You could try flushing the cooling system and checking for leaks and blockages.

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