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I have a 2003 aztek in the summer it heats up fine but as soon as it turns cold the temp gauge comes up maybe a quarter of the way. The air coming from the heat vents is warm but it should be hotter.
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Sounds like the water pump is cavitating . Replace water pump. Check coolant level also. Open the bleeder valve usually located on thermostat housing to remove air from system. close valve when coolant is present while filling. close radiator cap and top off recovery bottle to correct level. These engines are prone to overheating, do not let temp gauge get in the red.
Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.
does it do this first thing when its cold out ?? if so, fill the coolant res to the max line when cold, if light still comes on, it could be either the coolant leven sensor (my guess) or the temp sensor for the engine- these are known to go bad every few years
If you overcharged your ac, it will not get cold. It should take about a can and 3/4 max. Do this first, it probably has too much air in it. Since you don't have a vacuum pump, let some of the gas on the low side. You will feel the air coming out is not cold, but keep releasing until the gas coming out is cold. Now you have taken most of the air out. The gauge should be no more than between the blue and the yellow. If the low side gauge remain high, then you probably have a bad expansion valve.
it may be your thermostat, the gauge on the dash is a dummy gauge, there is only three positions that it sees, dead cold, operating temp, and hot, so even though the needle looks fine it just means it s closer to operating temp then it is to cold,
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