Engine running hot
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Hi, I'm looking for some pointers to diagnose a 1996 4.0 running hot. Here is what has happened and what I've done to get to this place..
Any pointers/advice welcome thanks |
sounds like radiator plugged
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i was going to ask about the rad as it takes for ever dribbling water in to fill it up, is that normal?
when it gets to temperature i can squeeze the upper rad hose and with the rad cap off get a lot of fluid movement |
if there was enough crap to clog your overflow/degas lines, how much of the same do you reckon have stationed themselves in those fine passages in the radiator?
you can clean it... true... you can take it to a specialty shop, and they can REALLY clean it... but... pssst- amazon has an all aluminum 3 row for less than a benji and a half... the only negative? the 12# cap is crap.... get a new 16# and pay close attention to how it seals. (make sure it seats right). also, and just because i'm on the topic- get one for a manual trans and put a plate style 20k BTU oil cooler behind the radiator instead of using the rad core for trans cooling... just a thing i do that would take to long to explain, but which makes considerable sense unless you live in the great white north and experience negative temperatures- and even then, do the same but install a thermostatic by-pass valve. |
I'm not sure you are going to get a valid reading from that location. It may be accurate for that location, but may not equate to the standard location. Have you checked it with an IR thermometer?
Other than that, see my sig, #4. |
^^ yep-check with IR thermometer or scanner. My sending unit was toast and the gauge was not reading right--even from the correct location
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225-230 is idling or driving in cool weather and i can drop that by blasting the heater
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i just ordered some Amway SA8 detergent as i think a thorough clean is the best starting point before i buy a new rad as i dont want to clog up a new rad
thanks for the advice guys |
So today I drained, flushed everything multiple times and installed a new Stant thermostat. I get the same idle and running temps.
I bought a ir thermometer and at operating temp the thermo housing reads 205-210, the back of head where thermo sender used to go reads 225 and the driver side front engine core plug reads about 230. My dash gauge reads 225 unless u blast the heat when it drops to 215 and this is the same driving. Do these temps seem normal? I noticed when idling if I leave the rad cap off the coolant never seems to get hot, only when I reseal and switch engine off does the level spill over. Should I still change rad? |
one of two things.. blown head gasket... or radiator.. if you are 100% sure you have not popped the gasket or cracked the head.. then put a radiator in it..they are not that much.. and if you plan on keeping jeep.. then that is one less issue you know is ok.. when i put used motor in 70k miles ago.. that had 145k or so.. i put new pump stat and rad in.. it runs 195 in florida heat..
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Want to know how to back flush the Radiator ?
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Originally Posted by Hommersimpson
(Post 3310253)
Want to know how to back flush the Radiator ?
Am I missing something to properly flush the rad? Having asked this I'm going to buy a new rad anyway to be sure |
When you get old one out.. pop the tank off on the side the upper hose goes to..
Now.. on back flushing.. if you take both hoses off at engine .. point the upper one down towards the ground.. take a rag.. and garden hose with a good flowing nozzle and put in lower hose.. turn on full blast.. when water comes out other hose let off nozzle.. then squeeze real quick and let off then on again.. if you have compressed air.. then use that instead.. look at what comes out.. bunch of trash ? or nothing? if trash then its pluged if nothing but clear water comes out then its either 100% plugged or clean.. lol p/s: if you blow radiator apart.. then it was plugged.. |
Can I ask, with the engine at normal temp should I be able to squeeze the upper rad hose albeit quickly as it's hot? Or should it be tight with water flow?
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I would be curious to know what it is reading on a scanner. You can get an app for android devices or apple devices, then connect with this, or something similar. Although I have read that 1996 XJ's can be tough to interface with OBD2 connectors.
https://www.amazon.com/Bluetooth-Dia.../dp/B0051CAE1C ..or bring it to an auto parts store they will scan it for free, and they should be able to tell you what temp it is, |
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