1999 Jeep Cheokee will not start after overheating.
I let my teenage son drive my jeep and it overheated. It was at night so the temp was cooler-as soon as he noticed smoke he pulled over and shut the vehicle off. There is no oil in anti-freeze and no anti-freeze in the oil. I have normaal oil pressure. I replaced the battery because it was on it's last leg anyway. We also changed the spark plugs. I do not know what else to check-and being a single mom I cannot really afford to take it anywhere....I would appreciate any suggestions. It turns over but does not fire.
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check the coolant pump is good and the radiator is not blocked both air flow thru the core and coolant flow thru water tubes, you can check for coolant flow thru the rad by feeling the core for any cold spots after running engine til warm then switch. off the radiator should be hot at top and cooler has you feel down with even temp all along any cold spot means the rad is partialy blocked.if the rad is red hot at top and cold at bottom it may be the pump if its got a electric cooling fan check thats working ok, good luck
I'm not really familiar with JEEP mechanics but if you've replaced your water pump and it's still overheating with full water/coolant level, you should check the thermostat; when it fails, it's a common cause or overheating in all kind of cars
I'm attaching some links to Youtube tutorial about replacing thermostat in a Jeep but you can expand your Google search using terms
Youtube replace thermostat JEEP Liverty
Most fans are designed to turn on only when the engine temp reaches a certain degrees and even then it will only turn on till it brings the engine temp down then it will turn off and it will cycle in this manner.I ask you why did you change out the fan relay was your jeep overheating?
Check the cooling fan motor and of course the fluid level. If the temp is changing thru the heater it could just be low on coolant , leaking from ? Two wheel drive have an elecrtic cooling fan only, make sure its spinning up when temp is 3/4. If not its probably the fan motor. Can be checked with a test light .
have you checked that the rad is clear and air can flow through it freely,,,is it blocked up so the water cant flow through it freely ,is the fan realy working or sezed up so it cant turn round??
if all this is ok, they changing the temp censor or for a test run,,,short the fan temp censor plug out with a bit of whire this should start the fan up,,,(watch your fingers when doint this) go for a run to see if the motor stayes cool