97 jeep cherokee temp sits at 210 but is now going to hot then back down any help

Asked by Jun 27, 2012 at 11:26 AM about the 1997 Jeep Cherokee

Question type: Maintenance & Repair

i bought the 97 jeep cherokee 4.0l  it has 200k i replaced the theromstat and did a full tune up new plugs wires cap rotor air filter cleaned the sensors from the throttle body the girl i got the jeep from ran it low on coolant when i got it i put about a gallon and a half of water in the radiator then a half gallon of 50/50  i realized i probably had air traped in there tried getting it all out may still be some it ran fine but now the temp is going to hot from the normal temp there is no smoke from exaust the oil is fine so dont think it head gasket but would love to have some input on what i should try next there are no leaks the overflow tank bubbles a bit after i turn it off then stops wandering if i didnt get all the air out what is the best way to flush the system and the heater core

2 Answers

265

first off is that the only coolant you put in it since you got it if so the water that you put in is gone from evaporation normally 50/50 you dont mix at all so i'd start with that add more 50/50 if problem still persists recheck the thermostat even though it's new it could still stick or be faulty i wouldn't worrie about the overflow bubbling mine does that too it wont hurt anything

10

If your coolant is bubbling in your coolant reservoir...you may have a cracked head. Don't take my word for it. My 97' Mercury Mountaineer would run hot and bubble, so I repaired it with "Blue Devil". Now my 97' Jeep Cherokee is doing the same thing.

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