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Chevy 2005 heater only gets hot when it wants to. What's wrong

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Does the radiator get hot? Low coolant level can cause this, as can a defective diverter valve that allows hot coolant to flow into the heater core.

Posted on Nov 13, 2014

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Posted on Jan 02, 2017

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Chevy heater


check on your heater core hoses both of them should be hot if one is hot and other is cold take off the hoses and back flush it if that doesnt help your heater core needs replaced

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I changed my heater core in my 99 chevy silverado what a job it still doesnt blow hot air what did i do wrong


MAKE SURE ALL BLEND DOORS UNDER DASH WORK PROPERLY. GOOD LUCK MOTOR62500. PS ARE BOTH HEATER HOSES HOT?

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Are there freeze plugs on a 2005 Chevy Equinox? We had a hard freeze last night and now the heater doesn't work.


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My 2005 chevy monte calro has been overheating it has hot coolant on dash but fluids are cold, goes off when applied gas hard to get fluids pumping, heater doesn't work and recently replaced radiator and...


Check the thermostat, if it isn't opening when engine warms up, the coolant in the engine will overheat and make pressure in the cooling system but the fluid in the radiator will still be cold.

Dec 02, 2010 | 2005 Chevrolet Monte Carlo

1 Answer

I have a 2005 Chevy Monte Carlo...which has dual heat and the heat on my passenger's side works but doesn't work on the driver's side.


There a heater control valves behind the dash which is either broken or have gotten stuck. The valve behind the dash act as on and off switch as as you would turn your faucet on and off. they tend to get stuck due to heat. The valve basically allowed hot antifreeze water to flow though the heater core giving you heat. when the valve broken or stuck open, the hot antifreeze will continuous flow to the heater core, therefore is the reason why you get constant heat. It a nightmare to fix, you will have to take the dash apart to get to it. the part run somewhere in 40 bucks. if your not mechanical incline, my suggestion would be the next time you get oil change from your local chevy dealership is to ask around those GM mechanic (Do not ask the Manager) and see who does side work; negoiate with him this way you will save big buck on dealership shop hours. Have only authorize GM to do the repair, not your local repairshop. Tearing into any automotive dashboard its every mechanics nightmare. Good luck!!!

Nov 24, 2010 | 2005 Chevrolet Monte Carlo

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My heater in my 2005 chevy silverado is blowing warm air but not hot


Your heater core is probably getting plugged up. THis is a common problem with any car as the flow through the heater core is not as much as through a radiator which causes silt deposits in the inside of heater core itself. If you replace that your problem should go away. You should be able to feel a difference in temperature of the coolant in the supply line versus the return line going to the heater core. If there's a dramatic difference then the core is plugged.

Nov 20, 2009 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

2005 Chevy Suburban front heat very weak, back is fine


try reversing the hoses on the front heater core. They are different sizes but it can be done this will flush the heater core and it should get hot then.

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Problem with No Heat on 2005 Chevy Avalanche - Cooling System?


it is most likey a sticking thermostat it either gets stuck closed or open in your case closed so collant isnt getting to the heater core and all you get is cold air blowing into the truck.
its a simple fix you can either do it your self or take it to a mechanic. now remember there are differnt thermostes so think about the climat you live in and get one according to that

Jan 07, 2009 | 2005 Chevrolet Avalanche

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