When you say the jeep will not turn over, you mean that it will not crank? If that is so then you may have a bad starter or coolant may have filled a cylinder with water. Pull out the spark plugs and see if it will crank over, check to see if water comes out of the heads when cranking. If it still does not turn over, check the starter.
SOURCE: overheating engin when at idel, fan not working
does both the hoses get hot bottom and top? this will tell you if theres flow through the radiator. If you have a voltage tester test the wires on the fan connecter check there is current going to the fan if so replace the fan its a common problem as previously stated.
if there is no power to the fan when the vehicle should be turning it on i.e. its hot enough check the fan relay under the hood.
SOURCE: 1997 Jeep Grand Cherokee cranks but won't start
Same thing happened to me at about 140k. It was the fuel pump. Best way to test if your pump is failing and loosing pressure is to see if the car will start immediately after it has been running, or turn the key to the alt position for a few minutes before starting. If your engine fires faster after it has been running or the key has been in the alt position you will probably need a new fuel pump. Great news is with a very deep socket to get the tank straps off its a 30 minute job to replace the pump/filter assembly.
SOURCE: 2001 Jeep Grand Cherokee 6 Losing Coolant
Pull your oil cap, check on the underside, if its white and thick you need a head gasket. that would explaine why the dealer telling you that you need a new headgasket. if it "looks normal" change your water pump.
SOURCE: 95 jeep wrangler cranks but won't start. replaced
After you crank it for a while, take out one of the spark plugs. If it is dry then you have a fuel issue. If it is wet and smells like gas you have a spark issue. Find that out and report back and then we can get more specific.
SOURCE: 99 Jeep Cherokee Sport, 4.0L -won't start
you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs
or if your missing crank sensors RPMs,
it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.
Exploded view of the water pump mounting-be sure to replace the O-ring during assembly
If available, use the two 6.0 mm x 1.0 mm threaded holes on the water pump to release the pump from the engine block
Make sure the water pump O-ring is fully seated in the water pump. Using a non hardening gasket sealant will help to hold the seal in place during assembly
To install:
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How to Fill Coolant If the coolant system has been flushed, first add 100
percent ethylene glycol in the amount listed for the appropriate engine application.
Then slowly add clean water to the system until the level of the coolant mixture
has reached the base-of the radiator neck. Wait for two minutes and recheck the
level of the coolant mixture. add clean water if necessary to restore the coolant
mixture level to the base of the radiator neck When refilling the engine cooling system, add three engine
coolant supplement sealant pellets, GM RN 3634621 or equivalent, and GM
approved new Ethylene Glycol Coolant DEX-COOL GM RN 9985809. If the cooling system is being refilled ONLY (no flush), a
50 percent ethylene glycol and 50 percent clean water mixture should be used to
fill the system. Fill the system until the level of the 50150 mixture has reached
the base of the radiator neck. Wait two minutes and recheck the level of the coolant
mixture. add a 50/50 ethylene
glycol water mixture as necessary to restore the coolant mixture level to the base of the radiator neck. Install the radiator cap making certain the arrows line up with the
overflow tube. Close all air bleeds.
DO NOT over torque the air
bleed valve. The air bleed valve is made
out of brass. Fill the coolant
reservoir with a 50 percent ethylene glycol and a 50 percent clean water coolant mixture. The proper amount of this mixture to
be installed into the coolant reservoir is listed below: Add 0.65 liters (0.68 quarts) of a 5010 mixture of ethylene
glycol and clean water to the coolant recovery reservoir. CAUTION: The low coolant indicator lamp may come on after
this procedure. After operating the vehicle so that the engine heats up and cools
down three times. if at any time the "TEMP' warning indicator comes on. Immediate
action is required.
Air bleed vent is at the thermostat house
Thank you for using FixYa.com
Regards, Lee Davidian
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