Question about 1998 Plymouth Neon

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Temp gauge the temp gauge will peak then drop then peak then drop several times in a row then it will not do it for a while then does it agian.... we have changed out the thermostat.... HELP please, at wits end with this can not figure it out, we have also pulled the casing off to see if there is water coming off the belts and there is nothing... is there a sensor of some sort in the reserve area that can be the problem???

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  • monicaorton2 Feb 23, 2009

    it is a 98 neon expresso highline, dual overhead and 2.0L

  • monicaorton2 Feb 23, 2009

    The fan will kick on and work also we live in MN and it has been doing this in Negative degree weather

  • brian tessereau May 11, 2010

    what engine? what year neon? that will help. few different possiblities from head gasket, to thermostat seal, to c.t.s to wire disconnected and dangling.

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With the fan kicking on normally that means that the coolant temp sensor is functioning fine, it sends a signal to the ecm to turn the fans on and off. have you had the coolant flushed lately? if so there could be an air bubble in there that needs bled out, a bad radiator cap, make sure coolant is at proper level, and is flowing and that both the upper and lower radiator hoses are getting equally warm, if not water pump may not be pumping, make sure that the serpentine belt is tight enough with no oil leaking on it making it slip. if all that is check you need to look at the gauge,and if the fans always kick on when the temp raises and then off when temp lowers. locate the temp sensor normally on the intake manifold on those, some i have found on top of thermostat housing and unplug and see what gauge does. maybe just bad gauge. is car running any different or is it running fine? hope something here helps, just let me know.

Posted on Feb 23, 2009

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