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Car heater not geting warm - Cars & Trucks

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First of all. check coolant level. One way to tell if the coolant is circulating through the heater core is to feel both heater hoses. Both the inlet and outlet return hoses should feel hot when the engine is at normal operating temperature and the heater is on. some vehicles have a "bleeder" valve (or more than one valve) on the thermostat housing and/or certain hose connections. Opening the valve(s) allows air to escape as the system is filled. The valve(s) should then be closed when coolant starts to dribble out the valve. On vehicles that lack these special bleeder valves, it may be necessary to temporarily loosen the heater outlet hose so air can bleed out as the system is filled. A plugged heater core. Accumulated crud in the cooling system may plug the core and block the flow of coolant. The only cure here is to replace the heater core. if above is ok. replace thermostat.

Posted on Feb 09, 2012

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Heater not working


Check your antifreze level(1) if ok let it run and warm up feel the hoses going to the radiator to see if there geting warm(2) if not change the thermostat (3) if all this fails could be a water pump or blocked heater core or blocked radiator. need to check for circulation. One more thing make sure your antifreze mix is right but 9 uot of ten it will be your thermostat.

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Darnell ,
The heater core is inline with the radiator , so the first thing you should check is if there is sufficient coolent in the radiator.

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Having same problem with mine. I am replacing the thermostat tomorrow to see if that works. Put a piece of cardboard in front of the radiator. Drive down the highway a few miles in the cold weather. If heater warms up, replace the thermostat and you should be good to go.

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On my 2000 Jimmy when I'm at low speeds in the city it usually blows quite warm out of the heater (not always). But suddenly it will quit blowing any heat at all. On the highway it just blows cold. The...


Hello. First, it is probably that the clotch in the coolin fan isn't working. When the coolin fluid is warm, the temperatur put it in work, and the fan works rapidly, when the temperatur lows, the clotch loose the fan an is waiting the warm up again. But your Jimmy don't have the coolin fan in the principal belt, it have an electric coolin fan. In that case, your problen is for a low level of coolin water, or the relays of the electric fan don't work properly.
Finaly, my english isn't good, because I speak in spanish, but if my bad english solves your problem, i'm geting so well. I working every day in electronics cars, and that is the basic metod of analyse that I use.

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if it has a block heater the plug should be on passenger side under bumper tucked up buy radiator not all come with block heater

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WELL IS YOU COOLANT LEVEL RIGHT AND IF SO WHEN TRUCK IS WARMING UP CHECK THE RAD HOSE'S AND SEE IF THE LOWER ONE IS GETING WARM ARE NOT OR IF THE TOP IS COLD BUT I WOULD START WITH THERMOSTAT IT'S SOUNDE LIKE IT IS COUSE FLOW ISUSSE HOPE THIS HELPS BUT IF BOTH HOSE ARE HOT AND YOU TOUCHE HEATER HOSE ONE HOT THE OTHER IS NOT THEN IT COULD BE HEATER CORE ISUSES

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1 Answer

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Check the heater hoses going into the firewall when hot they should both be warm one more so than the other. if they are cool you do not have coolant geting to the heater core thermostat is wrong or backwards. I asume you replaced the stat due to this problem so your hoses are probably hot. If there is a big differance the heater core may be plugged. flush it from the cooler of the two hoses with a garden hose out the side of the hotter hose. DO not do this while it is hot! If the hoses are close in temp you have a blend door control issue. It may be the actuator on the heater box or the controller on the dash. Good Luck

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Did you put on the cold weather bra? Try that,should help....

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