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Unread 01-26-2014, 03:07 AM   #1
toxicshock312
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Overheat

So I have a 97 zj and the thermostat it indicating my jeep is over heating but I have enough coolant and my oil level is good. Another thing is that the heater is turned on full blast but it's blowing cold air. Any suggestions?

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Unread 01-26-2014, 08:26 AM   #2
50notch
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If you coolant system is full and you have no heat and you're overheating, it's most likely the t stat is stuck closed and needs to be replaced. If you have a mechanical fan the clutch could be bad not engaging the fan when it gets hot. But I'd lean more to the t stat.
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Unread 01-27-2014, 10:55 AM   #3
johns1mj
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Check for air in the cooling system. If the vehicle over heats quickly and air is present in the system your head gasket may be leaking. If all else is equal change the thermostat.
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Unread 01-27-2014, 01:33 PM   #4
JasonStebbins
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Throw in a new water pump while you're in there. Fan clutch in good condition?
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http://www.jeepforum.com/forum/f13/1...talls-1407423/
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Unread 01-28-2014, 01:54 PM   #5
toxicshock312
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Yeah the fan good. Another thing that I noticed was when is was really cold whenever I turned the heater on before it started acting up the battery gauge slowly went down the longer the heater was running. Do you think that could have anything to do with that or just take the battery in for a recharge? I appreciate the help you guys are giving.
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Unread 01-28-2014, 02:22 PM   #6
JasonStebbins
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Quote:
Originally Posted by toxicshock312 View Post
Yeah the fan good. Another thing that I noticed was when is was really cold whenever I turned the heater on before it started acting up the battery gauge slowly went down the longer the heater was running. Do you think that could have anything to do with that or just take the battery in for a recharge? I appreciate the help you guys are giving.
Sounds like a dying alternator or bad battery if the gauge goes down with more electronics running. Overheating could be quite a few things. I would start with a thermostat/water pump replacement with a solid coolant flush.
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Common ZJ problems and how to fix them by JasonStebbins
http://www.jeepforum.com/forum/f13/c...x-them-1432264

12 things to do when your ZJ stalls by ZeeJay1997
http://www.jeepforum.com/forum/f13/1...talls-1407423/
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Unread 01-28-2014, 02:27 PM   #7
PolkaPower
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When my Alt was going south the voltage would get real low when the E fan clicked on. If the battery has completely discharged it's likely not going to fully charge anymore. Convention led acid batteries do not like to be fully discharged. If you have a good battery tender you can try to trickle charge it for 24hrs or so.
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Unread 01-28-2014, 02:32 PM   #8
JasonStebbins
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Quote:
Originally Posted by PolkaPower View Post
When my Alt was going south the voltage would get real low when the E fan clicked on. If the battery has completely discharged it's likely not going to fully charge anymore. Convention led acid batteries do not like to be fully discharged. If you have a good battery tender you can try to trickle charge it for 24hrs or so.
Still haven't figured out of he has a 6 or 8 cylinder. Assuming a 5.2L if "the fan is good"

My voltage would go down to 6 volts when coming to a stop when my alternator was on it's way out.
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Common ZJ problems and how to fix them by JasonStebbins
http://www.jeepforum.com/forum/f13/c...x-them-1432264

12 things to do when your ZJ stalls by ZeeJay1997
http://www.jeepforum.com/forum/f13/1...talls-1407423/
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