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I have a 2000 jeep grand cherokee laredo 6 cylinder 4.0liter. I have changed the water pump, the main belt, the radiator, the top radiator hose, the starter, the alternator, new battery. My question is I'm about to change the oil, oil filter, and spark plugs, and thermostat if it still runs hot what could it be. I have a new pressure cap on the radiator and when it gets hot if i lift to release pressure it goes down and the water in the jug on the side stops boiling like. Please help sooo frustrated don't know what to do.

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  • 5 Answers

Try using actual coolant, rather than water.

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

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SOURCE: I have a 2002 Jeep Grand Cherokee Laredo with the

If you put the thermostat in correctly (spring towards the engine) that should be OK. Likely if the water pump wasn't leaking or had a bad bearing, you wasted your $ on that.
If you re-filled it and did not have the heater on high heat, you may have some trapped air in there. But, still overheating says another thing. If you have a blown head gasket, it can pump compression into the cooling system and drive the coolant from the core. It will also overheat. You can have that tested at most any decent shop that will do a hydrocarbon test to find that.I think someone makes a chemical test kit for that but not sure if it's very expensive or not. White smoke from tailpipe will also be an indicator as will be any coolant in the engine oil or coolant on one or more spark plugs. If it turns out that it has a head gasket problem don't stop looking for problems as often a faulty fan or obstructed radiator can cause the initial overheat that caused the gasket to fail.

Posted on Jan 16, 2010

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jturcotte
  • 8548 Answers

SOURCE: I have a 2000 Grand Jeep Cherokee Laredo (6cyl).

It is likely you have air in the system. Park on an incline, take the radiator cap off, start the car, let it warm up until the thermostat opens, fill the radiator until it stops going down. See if that doesn't get you some hot air. If not, try the other steps I have in my post at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me.

Posted on Dec 13, 2010

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SOURCE: I have a 2000 jeep

SOUND LIKE HEAT CORES LEAKING ANTIFREEZE INSIDE DASH.

Posted on May 09, 2011

  • 1915 Answers

SOURCE: 1998 Jeep grand cherokee Laredo

When it sounds like it wants to start but won't, it is almost always a fuel problem. When you first turn on the ignition key (radio off, in a quiet setting) do you hear a faint 'hum' from the rear of the car? If so, your fuel pump is probably alright, so the next check it to remove the small, light green plastic cap (it might be black, about the size of a tire valve cap) on the top of the engine-it is part of the fuel rail and has a small pin in the center of it. With a rag in your hand, hold it over the valve, and with the key on, use a small screw driver and push the pin in-the rag will keep you from getting sprayed, if all is alright, but if you get little or nothing, you have a problem with your fuel pump, filter, fuel regulator or you may have a plugged 'sock' at the bottom of the tank.

Posted on Jul 19, 2011

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