Question about 2003 Jeep Grand Cherokee

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Car engine is over heating - 2003 Jeep Grand Cherokee

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You didn't include enough info to really help but most times overheating is caused by low coolant level from an external leak, a failed or failing thermostat, a bad radiator fan (electric or clutch type) or fan relay, coolant sensor etc. Any obstruction to air flow through the radiator or internal obstruction can also cause an overheat. Last but not least, either too much water or coolant can lower the boiling point. Make sure you have a 50/50 mix and a good pressure cap of the correct pound rating. (I think yours is rated at 16-19psi)
If you see white smoke from the tailpipe even after warm up, you may have a blown head gasket. In that case you'd need to take care of that but should also find the initial cause (any of the above).
When doing any testing be very careful...opening a system even when not in overheat can cause hot antifreeze to come out quickly and with force. (can make for very bad burns)
If you narrow down the problem a bit and need more specific info, just ask.

Posted on Jul 15, 2010

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My heater blows hot for a couple minutes then turns cold. After turning it off for a few minutes and back on, it blows hot then goes cold again.


LET YOUR CAR WARM UP FIRST!! or you risk the chance of over heating and casuing engine damage. start your car let it warm up for 5 to ten minutes and then try the heat. also when you start you should NEVER have heat on right away. the heat that you feel comes from the engine. and if the engine is cold and you are trying to heat it up it will put stress on the engine and over heat. ALL cars have to wait for their heat. that's why you see peoples car running in the morning with no one in it. so when they do get in it they have heat. heat will not work until the engine is warm.

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No heat when car sits idol, only when moving.


is this your first car?
I will presume the fan is running at full speed and heat max is set and the that you tried recirc lever. fresh air is less heat...
Cab heat bad. right?
only when moving, what?
Ill guess that no heat sitting idle for 30mins. TIME MATTER.
as does time of day and if first start of day and if the ambient temperature (out door temp counts, and guess what no country or stated told so i cant look it up, me fail)
first off,
the modern engine can take a huge long time, to heat up dead cold and not driven , that is why the op guide tells you,
start car ,wait 45 seconds and drive off slowly,
the warms the engine fastest , saving 90%of all engine wear.
this is proven fact by Germany long ago and now with SAE.org.
hard fact.
now if you know the car warmed faster before.
then this is possible 2 ways.
1: bad thermostat. (slow)
2: or the engine is running so bad, that the heat to the water jackets are weak.

the cab heat will be the same as the engine water coolant
if the engine is cold, so will you be. hard fact.
there are no electric air heaters here...

here is a frozen air page.

http://www.fixkick.com/Cooling-engine/Frigid-motor-cab.html


2 tests.
1: does the engine hit 180F or more and hold?
2; does it do that , at the same speed, as when new?

if not we trouble shoot that first. (fan works, and blows)

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1 Answer

I have a 2000 Mercury Cougar and the gauge inside tells me that the engine is over heating, no heat is coming from the heater when I turn it on, the fan for the engine is running at full blast, the engine...


Hi,

The overheating and lack of cabin heat both point to a failed engine thermostat which would be stuck closed. At the warm up stage, the coolant stays in the engine block to bring the engine to efficient operating temperature, then it opens and circulates the coolant through the radiator and heat core. If the thermostat is stuck closed, the engine will overheat, and coolant will never reach the heater core, and you will not get cabin heat.

Blinking oil light at idle which goes away during driving could be a low oil level, but may also be a drop in oil pressue. You could have a clogged oil fliter (at best) pickup tube, or a failing oil pump.

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1 Answer

The interior fan for heat and ac will not run


Your car's heater is a life saver in cold weather. Before attempting to repair your car?s heater, you should understand how your car?s heater system works. First, on this page is an explanation of how your car?s heater system functions, further down the page are some pointers on heater system trouble-shooting. To warm the passenger cabin of your car, your car?s heating system makes use of excess heat from the engine?s internal combustion process. A car?s engine, in fact, when in operation produces so much excess heat that if the excess heat is not removed, it would destroy the engine. It is your car?s cooling system that removes that dangerous excess heat. Some of an engine?s excess heat is released through the exhaust. Most of an engine?s excess heat is absorbed by a circulating liquid coolant, which is a mix of water and antifreeze. The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at your car?s front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into your car?s passenger cabin. Because your car?s heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system.

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My heater doesn't come on for my 1997 plymouth neon, could it be a fuse?


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The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at your car’s front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into your car’s passenger cabin. Because your car’s heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system.
The heater core in your car is similar to the radiator in the front of your car; in fact it looks like a small radiator. The difference is the heater is mounted inside the car and air is blown through the fins of the core. The heater hosestransfer engine coolant from the engine to the heater core, this allows the heat from the engine coolant to be utilized and warm the passenger compartment. When a heater stops functioning determine what type of failure has occurred to execute a repair. We have listed the most common problems below.

please click on this link directly for more detailed help
http://www.2carpros.com/first_things/heater_failure.htm
check the diagrams and parts in the link to troubleshoot your care heater
This will help. Thanks please keep updated. please do rate the solution positively .thank you for using fixya

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Have you checked the thermostat? Over heating will damage engine, do not drive car untill you fix over heating you will kill engine!!

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Engine light wenton, car heated up, car would not


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1 Answer

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