Question about 2003 Chevrolet S-10

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Heat doesn't work. When I turn the defrost on the air conditioning comes on. Coolant is fine.

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  • mkboggs92 Oct 09, 2010

    Yes, thank you

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This is not a fault with your controller. Double check your temperature control and make sure it is set to max heat. When you select Defrost for some unknown reason most of the dealers have decided to make this a triggering event to activate the AC unit. The only way to stop this is to disconnect the AC unit wiring harness. You can usually get the same defrost routing of air by selecting the position just before defrost which will not activate the AC unit. as far as getting heat out of the vent without doing this you need to check the main heater core line from the radiator or engine block. This is a 1 inch hose that has a little controller , usually vacuum controlled, to open and close the flow of heated water from your Engine or Radiator. You can check this controller to make sure it is opening and closing correctly.

Posted on Oct 09, 2010

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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

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Remove heater core


Heater Core CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old prev.gif HEATING AND AIR CONDITIONING Vehicle air conditioning is the cooling r refrigeration of the air in the passenger compartment. Refrigeration I accomplished by making practical use of the laws of nature. HEAT GOES TO LESS HEAT. All this means is that heat transfers. If two substances of different temperature are placed near each other, the heat in the warmer substance will always travel to the colder substance until both are of equal temperature. As a fail-safe, the air handling system is designed to provide defrost when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak. Instead, a leak in the vacuum control circuit will send all airflow to the defroster outlets. This condition may occur during acceleration (slow vacuum leak), may exist at all times (large vacuum leak), and may happen only when certain specific functions are selected, indicating a leak in that portion of the circuit.
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That is all that is listed for Heater Core on my online resource. Sorry that it is not more explicit for instructions.

Maybe try Alldata.com for more information, but it will cost.

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Plenty of air but no heat one side of dash use to blow hot air. Now neither side blows hot air. 2000 jeep grand cherokee coolant is fine driver side seat heater doesn"t work air bag light comes on every...


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I think u r right. this is a problem that most certainly requires a skilled technician to solve If u dont know of anyone who is good at this problem that leaves only the dealer and of course they are going to sockit to you. get an estimate.. it might be a good idea to check all your fuses first. then look under the hood for any loose vacum lines. dont forget your fuses under the hood usually in a plastic box.

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There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

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when your on defrost the ac will automatically turn on if its not on defrost the ac shouldn't come on thanks

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Could be a couple of things. The first thing that I would check would be the coolant level in the radiator, if that is low it can cause the heater not to blow hot air. The second thing I would find out is if the control to change from cold to hot is actually working? ( if it is a manual slider then the cable might have come off of the control behind the dash...if it is digital then there may be a wire off?) The third thing it might be is that your Heater Core went bad and will need to replaced. As I said above, I would check the coolant level first and go from there. Hope it helps!

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