need help. Overheated, replaced parts, still overheating - JeepForum.com
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post #1 of 16 Old 02-25-2012, 07:09 PM Thread Starter
NICU
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need help. Overheated, replaced parts, still overheating

overheated on the highway the otherday. while driving notice the heat climb to 260 right after that within seconds trying to get over to the breakdown lane (heavy traffic) my radiator blew. pulled over turned the engine off. got tow home. put in new t-stat (thought that was the problem)new radiator flushed and filled radiator and new cap.burpped the system.

still overheats while driving and have no heat at all . oh ya change the oil too just changed it days before this happend. please help

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post #2 of 16 Old 02-25-2012, 07:33 PM
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Let it idle for longer in your driveway, to see if there is more air in the system, if that does not work.. disconnect the heater core hoses, try to run a garden hose through the core to check if it is blocked. If it is not blocked inspect water pump.

http://www.jeepforum.com/forum/f9/sh...hread-1327746/
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post #3 of 16 Old 02-25-2012, 07:43 PM Thread Starter
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i have heat at idle and waterpump shaft was tight
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post #4 of 16 Old 02-26-2012, 06:26 AM Thread Starter
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bump
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post #5 of 16 Old 02-26-2012, 07:23 AM
JealousDad
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I bet a lot of people are thinking head gasket
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post #6 of 16 Old 02-26-2012, 07:36 AM Thread Starter
NICU
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ya i was thinking maybe it was that but oil looked clean and coolent had no oil in either
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post #7 of 16 Old 02-26-2012, 07:43 AM
JPNinPA
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So you have heat when idling but not driving?
No heat could be air in the system or a blocked core as stated above.
Could be the fins rotted off the pump impeller.
Could be the spring is gone in the lower radiator hose allowing it to collapse while driving.

"Never look down on anyone unless your helping them up"- Jesse Jackson
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post #8 of 16 Old 02-26-2012, 07:45 AM
chainbrain2002
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only real thing that can blow a rad is a catastrophic head gasket leak at high speed. it caused the coolant chambers to severely over pressurize causing the tank to pop. looks like its time to do a head gasket job. oh and when you have the head off do yourself a favor and take it to a machine shop and have them magnaflux it to check for cracks.
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post #9 of 16 Old 02-26-2012, 08:48 AM Thread Starter
NICU
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spring is good on lower hose and it still runs great. might just replace the water pump it a few years old.if its a head gasket problem and the head is cracked what should i do?
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post #10 of 16 Old 02-26-2012, 09:28 AM
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Here are some things you could check for a cracked head.
When cold open your radiator cap then start the engine. When it reaches temp and the thermo opens you might see a continuous stream of small bubbles coming out.
Check your exhaust. If it looks like a continuous white smoke(steam) it's likely you have a head gasket issue.
Compression tests can show leaking head gaskets.

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post #11 of 16 Old 02-26-2012, 09:49 AM
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I agree with that. Also after the engine gets fully warmed up with rad cap on. Go to exhaust and sniff the fumes from it. If it smells sweet other then regular same thing. If so take to shop and have them perform a cylinder leakdown test. That will show where the leakage is coming from. If this is the case. Head gasket time. If head is cracked. Replace with non 301 head.

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post #12 of 16 Old 02-26-2012, 12:53 PM Thread Starter
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ok no bubbles when cap off and running up to temp and no white smoke coming out of exhaust
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post #13 of 16 Old 02-27-2012, 01:55 AM
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Quote:
Originally Posted by chainbrain2002 View Post
only real thing that can blow a rad is a catastrophic head gasket leak at high speed. it caused the coolant chambers to severely over pressurize causing the tank to pop. looks like its time to do a head gasket job. oh and when you have the head off do yourself a favor and take it to a machine shop and have them magnaflux it to check for cracks.
Not really, 260 liquid water is under tremendous pressure. It will easily split these plastic tank rads.


Are you getting coolant flow at the rad?

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #14 of 16 Old 02-27-2012, 03:41 AM
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looks like its time to do a head gasket job. oh and when you have the head off do yourself a favor and take it to a machine shop and have them magnaflux it to check for cracks.
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post #15 of 16 Old 03-17-2012, 09:13 PM Thread Starter
NICU
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Just changed out the water pump and clutch fan that should do the trick because I thought the pump was good but it turned out it was no good. I just got back from south Carolina so I had no time till today to mess around with it. That's for all the help everyone
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