Question about 2002 Jeep Grand Cherokee

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Water Pressure Released

The thermostat? Would that be a good place to start. This is the first it has overheated.

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1st verify the engine cooling is working, I assume it is electric?, if that shows ok then yes the thermostat may be the culprit. In any event be careful when removing the cap on the radiator if the engine is hot, I don't want you to get burned on my account. Thanks

Posted on Jul 31, 2008

  • yadayada
    yadayada Aug 04, 2008

    correction: That is cooling fan working

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2 Answers

Overheated. Why won't it start?


I'm not really familiar with JEEP mechanics but if you've replaced your water pump and it's still overheating with full water/coolant level, you should check the thermostat; when it fails, it's a common cause or overheating in all kind of cars

I'm attaching some links to Youtube tutorial about replacing thermostat in a Jeep but you can expand your Google search using terms
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Sep 10, 2015 | Jeep Liberty Cars & Trucks

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My chevy Venture van still overheating after radiator replaced, temp gauge replaced and fans fixed. WHY?


You may have air trapped in the cooling system. This will cause overheating. When you fill the system, there is a small brass air purge valve above the coolant pump and another on the thermostat housing. These need to be loosened and trapped air released when filling the cooling system.

Mar 19, 2015 | Chevrolet Venture Cars & Trucks

3 Answers

Car running hot


the water coming out of the front would be from the water pump, it also would be an indication that the pump is bad, which may have been the reason of why the car overheated in the first place.

Dec 19, 2014 | Cars & Trucks

2 Answers

2001 galant v4 overheating


Don't remove radiator cap when engine is hot.

Is your reservoir full to the right level? Check hoses for a leak. I would have the system flushed if there are no hose leaks in case air is in the system which can cause overheating. This can be done for about $50-$100 or less at many places. Sometimes when a thermostat is replaced the system isn't bled correctly. I hope its not your water pump, but it may be.

Good luck.

Mar 08, 2014 | Cars & Trucks

1 Answer

How do you replace a thermostat


WARNING: SCALDING HOT COOLANT, WATER OR STEAM
NEVER remove the pressure relief cap under any conditions while the engine is operating. Failure to follow these instruction could result in DAMAGE to the
cooling system or engine AND/OR personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system or reservoir, use extreme care when removing the pressure relief cap from a hot cooling system or reservoir.
  1. Wait until the engine has cooled.
  2. Wrap a thick cloth around the pressure relief cap and turn it slowly (until the pressure begins to release.
  3. Step back while the pressure is released from the cooling system.
  4. When you are certain all the pressure has been released, (still with a cloth) turn and remove pressure relief cap .
REMOVAL

  1. Drain the engine cooling system so that the engine coolant level is below the water thermostat (8575).
  2. Raise vehicle on hoist. See General Information.
  3. Disconnect the lower radiator hose (8286) and degas bottle hose from the water inlet connection.
  4. Remove the two water inlet connection retaining bolts. Remove the water inlet connection.
  5. Remove the O-ring seal and water thermostat from the water thermostat housing. Inspect O-ring for damage and replace if necessary.
  6. If required, remove water bypass hose from water thermostat housing and remove water thermostat housing retaining bolts, water thermostat housing and O-ring from oil filter adapter (6881). Inspect O-ring for damage and replace if necessary.
INSTALLATION
  1. Install the water thermostat, O-rings, water thermostat housing (if removed) and water inlet connection as illustrated.
  2. Install and alternately tighten the retaining bolts. Tighten bolts to 20-30 Nm (15-22 ft. lbs.).
  3. If removed, connect the water bypass hose to the water thermostat housing.
  4. Connect the lower radiator hose and degas bottle hose to the water inlet connection.
  5. Lower vehicle.
  6. Fill the coolant with Ford Premium Cooling System Fluid E2FZ-19549-AA or-B (in Oregon, F5FZ-19549-CC, in Canada, Motorcraft CXC-8-B) or equivalent that meets Ford specification ESE-M97B44-A in a 50/50 mixture with water.
  7. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.
  8. Stop the engine. Top off degas bottle as required to maintain minimum cold fill level.

Jan 10, 2011 | 1997 Lincoln Continental

1 Answer

My 2006 BMW 525XI was working fine all day and then I went out to air dry the car after i hand washed it this evening and as soon as I left the driveway I heard the radiator fan kick on and within I mile...


I assume you have checked the cooling system to ensure that first, that it is completely full of coolant (not just the overflow tank) with no air locks and second that there are no leaks anywhere and the radiator cap is in good condition. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split after a few years, allowing coolant loss. Those spring type hose clamps tend to be less effective in clamping as the hoses become hard. Worm drive ones are the best to use.

If there are no leaks or air locks, the over heating could also be caused by a clogged radiator (more than 15% restriction in the radiator flow capacity will cause overheating problems), a faulty water pump or a faulty thermostat.

If there are no leaks and water pump and thermostat are working correctly, but undetected loss of coolant once the engine heats up, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick.

If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.

Don't forget to rate this post !!

Sep 30, 2010 | BMW 525 Cars & Trucks

1 Answer

The car is overheating i do not know where the thermostat is


I assume you have checked the cooling system to ensure that first that it is full of coolant and second that there are no leaks and the radiator cap is in good condition. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old, allowing coolant loss. If there are no leaks or air locks, the over heating could also be caused by a clogged radiator (more than 15% restriction in the radiator flow capacity will cause overheating problems), a faulty water pump or as you suspect, a faulty thermostat.
If there are no leaks but undetected loss of coolant, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing high pressure combustion gases into the engine water jacket, which super heats the coolant which then boils off, and is released via the cap.
If unsure take vehicle to cooling system specialist and have them do a pressure test and more thorough diagnosis.

Aug 28, 2010 | 2000 BMW 3 Series

2 Answers

Overheated while idling in park for 5minutes.


your thermostat probably stuck closed.when you cooled it down,it opened again.change the thermostat.

Jul 14, 2009 | 2004 Kia Sedona

1 Answer

Rough idle,overheats .


It could be a bad thermo stat, I just got a 96 camaro and have yet to do too much with it but my prior car a 87 honda had all sorts of overheating issues. It would have a loping and rough idle and overheat a quick fix was a pressure release bolt on the top of the thermostat. I would let it idle and while idling i would loosen the bolt on the thermostat and water would start shooting upward. Basically air was in the system and theis would allow the air mixed in to be released. I would keep a hose/antifreeze handy to top off the radiator as necessary. Im not sure if the camaros have the same thing on them but you may try that out if they do! Good luck!

Apr 20, 2009 | 1996 Chevrolet Camaro

1 Answer

1997 bmw z3 conv. 1.9 overheated, changed radiator, new thermostat, hoses car still overheating , fill radiator w/water but water does not seen to go through , released air pressure from radiator and...


hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.

Apr 04, 2009 | 1997 BMW 328

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