Question about 1992 Jeep Cherokee Sport

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Jeep over heat in minutes, I changed the thermusat, and flush and filled the radeator but it still runs hot

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First of all: Check to make sure that the fan is kicking on. if not, it is time to replace. Also, check A) The tailpipe, look for white smoke past startup B) Open the radiator (while cool), and see if there is a white smoke, or "bubbling", C) See if the oil has water in it. Either of these could indicate a failed head gasket.

Posted on May 24, 2011

Testimonial: "it was helpful I need to check everything, and didn't think of that."

  • Isidore Brooks May 24, 2011

    the hose to the top of the engine feels like no fluids are going into the engine. the raditor not hot but the engine is.

  • Stetson RDT
    Stetson RDT May 28, 2011

    Hmmm ... I would get your jeep pressure checked, or a head gasket check, etc, whatever the mechanic has.



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OK heres another one on same Cherokee....back flushed the heater core...changed thermostat and still blowing lukewarm heat... 3 people said sounds like a cracked head or head gasket but wouldn&#39

you are air locked in the heater core you will have to remove one heater hose and fill anti freeze into that hose until coolant runs out of the open nipple then put hose back on fast top off coolant start engine run til both hoses are hot for heater core..if only one is hot coolant is not circulating

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Sounds like low flow issue. Flush and clean system, PROPERLY! Buy a flush kit, drain system, blow compressed air through, fill with cleaner/water mix, run for 30 min with heat on, drain system, blow out with compressed air, fill with water, run for 30 min, drain, blow out with compressed air, fill with 60% coolant mix.

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My 300 m is haveing cooling problems after driveing about 14 ml it ddoen't overheat but there is bubbleing in the resivore. i just got my fan replaced and a new cap

If your getting bubbling in the resivour tank while the engine is running then you might have a head gasket failure. There is a test for that. It uses a tube of special liquid that is sort of pink. You fill the container and then put it on the radiator fill spout. Start the engine and operate it for 2 minutes. If your leaking combustion gases into the coolant the liquid changes color to yellow. This test kit can be bought at AutoZone for about $35.00 (other stores may have he kit also).

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Flushed radiator. Changed thermostat because prior to flush. engine wasn't heating up properly. During drive, the 1st step in flush procedure, engine heated properly and heater worked properly. Drained and...

Air in the system. Run the engine with the cap off, rev the engine up and this will help purge the air. Fill as needed and keep check on it for a few days.

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I have a 4cyl 1999 Jeep Wrangler. The heater only blows warm air, no hot air. I have back flushed the heater core with a garden hose and there was no clog. I have checked the t-stat and it is...

The key is the heater hoses. The top hose is the inlet for the heater core and the bottom is the return line. If the bottom hose is not hot, there is little flow through the heater core. It does not have to be completely clogged to reduce the heat output. The core needs to be flushed multiple times IN BOTH DIRECTIONS through the heater hoses. If this does not restore the heat, try a commercial/radiator flush. Many people have had alot of success by filling the core, through the heater hoses, with a CLR type product and letting it sit for 10-15 minutes to remove scale followed by a thorough flush.

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1 Answer

Jeep Grand Cherokee running hot. I've changed the

Check your radiator for external and internal obstructions (leaves, bugs etc on the a/c condenser or leaves between the condenser and radiator, rust or calcium deposits inside the radiator core all cause loss of heat transfer)
Also make sure that the system is full and that the electric fan and the clutch fan are operating properly. (electric fan should come on just above normal operating temp and clutch fan should not be "freewheeling" above temp either)
Note: If you need to have the radiator flushed, do it separately from the engine. especially the inline 6 and 4 engines rust up inside and if the system is flushed with the radiator connected, the debris will pack up inside it and actually can worsen the condition.

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Always re-fill with heater on full hot.

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check to make sure the bottom radiator hose is not collapsing. sticking together. once it sucks together its like the thermostat being closed. the faster the engine turns the it sucks together. also make sure its not the clutch on the fan gone bad. if it has one. to ckeck ,look under hood at fan ,have someone to rev engine. make sure the fan turns as fast as the engine turns . if it doesn't it's a bad fan clutch. goe put a new one on.

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