I got a 1994 Jeep Cherokee 4.0 that is overheating. I pulled the thermostat ,ran it,still overheats. Pulled the waterpump and there is absolutely no water in the head. Put a new water pump on and have no coolant flow at all. What wouldn't stop it completely?
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Overheating issue
- Thread starter ceasar
- Start date
Jeep Driver
NAXJA Forum User
- Location
- Parrottsville
Clogged radiator.
Green Mesa XJ
NAXJA Forum User
- Location
- Pensacola, FL
Or gunk in other water ports
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blakews2217
NAXJA Forum User
- Location
- Alton, Illinois
Is there any water in it? Pull the rad and try to run water through it.
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- Location
- Southern Maryland
Clogged heater core and/or control valve can stop the fluid from flowing (hoses act as a bypass when thermostat is closed). Get a small loop of hose and run from the housing to the return tube to verify.
- Location
- Southern Maryland
No at that point the pump would simply push coolant through the head and out through the housing. If you still don't get any flow its possible that the ports are clogged in the block or head (my old 91 engine had a clogged port in the head, still ran!). Otherwise the radiator itself is clogged.
I would pull the hoses and the thermostat housing, and stick garden hose in the head until water freely poured out the lower block. Then do the same for the radiator and heater core.
I would pull the hoses and the thermostat housing, and stick garden hose in the head until water freely poured out the lower block. Then do the same for the radiator and heater core.
- Location
- Southern Maryland
probably
- Location
- MilkyWay Galaxy
The cooling tubes in the radiator are super thin on the ID. They can clog up super easy. They are the choke point, first to clog up. But on a 91 open cooling system, you should be able fill the drivers side tank of the radiator and flood most of the engine block. BUT!!! IF the radiator tubes are clogged, no pump can pull water from a closed fully blocked radiator.
My first used jeep had 75 % of the tubes full blocked off already. It was 70% of the overheating problem, 87 Renix XJ.