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Over heate my 2002 grand Cherokee . It has 3 codes po 300 po 301 po 302 . Blown head gasket ?

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  • Cars & Trucks Master
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You are probably right as all codes refer to misfire in cylinders.. have a compression test done to check for blown head gasket and cracked/warped head and have a cooling pressure test done also to show cracked head and other than head gasket.

Posted on Jul 21, 2013

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fastboyz
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SOURCE: head gasket blown

there are many was a head gasket can blow . sometimes they just leak to the outside sometimes they leak to the coolant and then it blows out your antifreeze. if you have a blown head gasket you will see it when you pull the head. and yes you should hace the head checked at a machine shop and install with a new head set never reuse a gasket .
later paul

Posted on Sep 15, 2008

  • 512 Answers

SOURCE: Head Bolt Torque for a 2000 Grand Cherokee Laredo 4.0L

the torque is a 4 step process

1 torque all bolts to 22 ft/lbs
2 torque all bolts to 45 ft/lbs
3 recheck all bolts to 45 ft/lbs
4 torque bolts 1 thru 10 to 110 ft/lbs
bolt 11 to 100 ft/lbs
bolts 12 thru 14 to 110 ft/lbs
bolt #1 is the fourth bolt from the front on the passenger side....#2 is the fourth bolt on the drivers side then you continue in a clockwise order

Posted on Jan 04, 2009

  • 1596 Answers

SOURCE: head gasket sealant

As a A S E Certified Tech I Do NOT RECOMEND ANY "QUICK FIX" ADDITIVES Especialy for such a Critical Engine Component

More Costly but Also More effective is to Tear down Engine and Replace Head Gasket as You may have A Cracked Head Or Block That NO ADDITIVE will TRUELY REPAIR PROPERLY

Rough Estemate In USA Midwest $350.00-$600.00 For The Real FIX yep they vary that wide Some of us Love Helping PEOPLE the Rest LOVE THE MONEY MORE

Posted on Jan 14, 2009

  • 226 Answers

SOURCE: blown head gasket

I would change both, as well as use new head bolts. Make sure your heads are not warped or cracked, especially the one that is leaking. There may not be any need to change the head if it is not cracked. These are prone to blowing a gasket especially after 150K miles or so. It will not cost a huge additional amount to change both head gaskets since the engine will have to be disassembled down to the heads anyway. Hope this helps you, Rick

Posted on Apr 18, 2009

c17hydro
  • 2984 Answers

SOURCE: 1998 Jeep Grand Cherokee Laredo 4.oL I got a code po113

Trouble Code: P0113 (4.0L L6 VIN S Auto)
IAT Sensor Circuit High Input Print this code dataprint_icon_codes.gif Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details

Trouble Code Conditions:
Check with ignition on or engine running; battery voltage more than 10v; The PCM detected the IAT Sensor input was over 4.90v (exc. Dakota, Durango, Ram) or 4.98v (Dakota, Durango, Ram) for 3 seconds.

Possible Causes:
  • IAT Sensor signal circuit shorted to VREF (5v)
  • IAT Sensor signal circuit is open, or the ground circuit is open
  • IAT Sensor is damaged or it has failed (an internal open circuit)
  • PCM has failed


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Posted on Dec 01, 2009

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Did you bleed all air from the system? Is it actually overheating or is the light just coming on? If so, replace the temperature sending unit. If you are loosing coolant with no apparent leak then suspect a blown head gasket which will cause the engine to overheat. A compression test will verify this.

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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.

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Jeep starts,clatters, then dies


If you had a blown head gasket you should have water/coolant all over or in your oil. Check your throttle positioning sensor according to specs in your haynes manual. My 02 jeep grand cherokee was chattering while I was driving and ended up dying on the highway and I coasted into this town and luckly an auto parts store was right there. I tested it and it cost me 70 dollars.

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double check all hoses to be sure if it for sure isnt leaking there check to see if you have a blown head gasket or cracked head

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