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Old 02-19-2016, 10:23 PM
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Overheat after core tie off

Ok I have a 96 Grand Cherokee Laredo. The heater core is bad so I tied it off before winter. Everything is fine besides needing a CPTS but it overheated and lost all coolant yesterday. Seemed to happen after running A/C which shouldn't have been problem but I can't figure out why I'm overheating at about 240 and having to replace all fluid 2 times in last 24hrs. Any suggestions. Thermostat? Air blockage in hoses? Can't find where leak is coming from. Thx

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Old 02-21-2016, 10:16 AM
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Re: Overheat after core tie off

Welcome to the garage.
Which engine?
Did the overheating start imediately after plugging the heater core?
Any signs of external leak? No coolant in oil or white smoke when the engine runs?
Did the feel the upper coolant hose that it is hot? A cool hose, but high coolant temperature would indicate a stuck closed thermostat.
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Old 02-22-2016, 12:03 PM
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Re: Overheat after core tie off

It's a 4.0 6 cylinder. Found that it was thermostat. But here is my next problem problem among many with these jeep and their sensors. Clicking noise coming from the relay like underneath the dash. I've done some research and it's possibly a new battery may be a new relay fuse for the starter or something that you call a NSS for short that I haven't had time to look up yet. I'm new to working on cars. I have fixed a good few things on my own already that most men looked at me as if I was crazy that I actually got it done. YouTube is an amazing thing these days. But these sensors are driving me crazy. Thanks for the reply but if you have any suggestions to my new problem please feel free for I am NOT in the mechanic business so I don't know the lingo.
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Old 02-22-2016, 07:13 PM
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Re: Overheat after core tie off

So when does the clicking noise starts? Is it constant? If it is a relay, then you should be able to feel it. Put your finger on each relay one by one and you will feel which one clicks.
NSS i know as Neutral Safety Switch, but that one is on the transmission.
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