Question about 2004 Jeep Grand Cherokee

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Over heating boiling in the fill bottle - 2004 Jeep Grand Cherokee

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Ok start from small things,check ur radiator cap n pressure test it,if no good change.if that s not the problem than check ur thermostat if it opening at right temperature and opening fully.if is ok fit it back otherwise new one,and it that doe sent solve the problem have ur radiator cleaned by the radiator repair man and if that too doesent solve the problem that it ur head gasket.have that done it will b all right

Posted on Oct 04, 2009

Testimonial: "Found someone had changed the radiator cap and the cap did not touch the seat of the fill tank. Found the standard cap in the panels and we seem ok"

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The cooling system in a vehicle should be a pressurized sealed system and a sealed system does not allow coolant to boil. I you have boilin coolant then I you have a pressure leak somewhere and my guess it would be your head gasket. That would be something to get checked out fast so you don't warp your head.

Posted on Oct 04, 2009


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Posted on Jan 02, 2017

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1 Answer

Water boiling out of water bottle

don`t sound good, but i would see if water was circulating in radiator when warm,and check if fan comes on like it is supposed to to cool it ,if water does not circulate check hoses to make sure the suction does not restrict flow ,if no circulation you could try replacing thermostat (cheapest fix ) anti-freeze dilution (second cheapest ) or uh-oh maybe blown head gasket......

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When i turn on the heat it smell like coolant

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Drain anti-boil (wait until car is cool!!) and pull the core. It is located in the HVAC system, bottom right side. You will need to remove a substantial quantity of interior components to do this. Be prepared for some coolant spillage as you remove the core.

Using new hose clamps, install the new heater core, ensuring all connections are secure. Install any previously-removed interior/HVAC components or covers.

Refill the anti-boil through the overflow bottle, leaving the cap off. With the heater set to max heat, start the car, and allow to warm to normal operating temperature. Now slowly fill in the coolant to the specified level until the system is free from air bubbles. Install the cap.

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I see two possible causes.
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Mine got hot did not boil was low on water have filled up both bottle and engine but dont kno if its ok now

Most likely you have a failing heat gasket
& the coolant is going out the exhaust

I would stop using it & your choice on how
to approach the diagnostic part,you take apart
or get out your check book for a local shop

The overflow tank does get warm but only from
normal coolant expansion & then at night when it is
cool is drawn back into system

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1 Answer

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The definition for that code is p1299 Cylinder head over temperature protection active. If your overflow tank (water bottle) is emptying check the oil for water contamination (it will look milky) also look at the exhaust for excessive white smoke, you may have a bad head gasket and hopefully not a cracked or warped head. Does the engine run alright? Has it overheated?

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