Question about 1983 Jeep CJ7

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Jeep cj7 renegade with 360 amc motor rebuilt 5500ks ago three core radiator ok condition no thermostat overheats

Overhating

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Check your thermostat or a collasped hose also make sure the radiator is not stopped up

Posted on Jun 06, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 1861 Answers

SOURCE: overheating

Well, assuming that the water pump is turning the correct way, looks like you are going to have to pull the radiator out & take it to a guy who cleans radiator interiors. Seems to me that you may have some sediment built up and the water is not circulating thru the rad. This would explain why the top is warm & the bottom cool with no thermostat. Whilst the rad is out, flush the block with water. See what comes out. Don't use a "flush kit" just yet. In my experience, the flush kits that you buy are not good for this issue, have it done by a pro, but, after he cleans it, then get a flush kit & flush the block anyway. If there is sediment in the radiator (from sitting), there is def sediment in the block.

The timing would have to be WAY OFF to make it overheat.

Posted on Sep 17, 2008

  • 21 Answers

SOURCE: have a 1979 cj7 cant

are you sure you have an amc 360 and not a 304 and also are you sure the flywheel came from an amc 360 and not a chevy 350? A 350 will bolt directly in place of the 360. You might also try a 350 flywheel.

Posted on May 10, 2009

  • 17 Answers

SOURCE: Have an '85 CJ7--put in new radiator and

Take out the thermostat and run it like this for while. If the motor still over heats: Look over by the battery, do you see where those two hoses from the radiator and the water manifold are going into the firewall? Take the hose going to the manifold from the firewall off of the connection at the firewall and connect it directly to the water pump. I think the manifold hose is the one on the right just make sure it's not the one coming from the water pump. You'll have to remove the hose coming to the fire wall from the water pump where it is connected at the pump but, that's OK for now just tie/tape it to something out of the way. Now then, your water pump will be sending water directly to the water manifold without any obstruction. When you run the motor for a little while and find that it stays super cool, I then suggest (if you want any heated air this winter) that you have the heater core (there behind the firewall where the two hoses were going) flushed clean or replaced and hooked back up. Once water can flow freely through the system your thermostat can probably be reinstalled w/ out overheating the motor.

Posted on Aug 10, 2009

coupedeville
  • 97 Answers

SOURCE: 1984 Jeep CJ7 heater core leaking

  1. Disconnect battery ground cable and drain cooling system.
  2. Disconnect heater core hoses.
  3. Disconnect damper door control cables.
  4. Disconnect blower motor electrical connector.
  5. Disconnect water drain hose and defroster hose.
  6. Remove nuts retaining heater housing assembly to instrument panel. Remove heater housing assembly by tilting heater downward to disengage it from air inlet duct and pulling toward rear of vehicle.
  7. Remove heater core from heater housing.
  8. Reverse procedure to install.

Posted on Nov 17, 2009

  • 6468 Answers

SOURCE: what transmission is the 4-speed in a CJ7

the bell housing might be different

Posted on May 20, 2012

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It seems my jeep is running a little hot..above 210..usaully happens when the air is on or going up a grade.. Had coolantr changed didn't seem to help


Check the radiator and A/C condenser in front of it for leaves bugs etc packed into the core. You also may have slight internal plugging forming inside the radiator itself. (happens most in areas with high mineral content in the local water)
In my opinion, Jeep radiators are undersized due to ground clearance issues. You can buy radiators with an additional row of cores but they are generally a bit pricey. On very long grades, it helps to turn the heater on. That will provide additional cooling though it is a bit uncomfortable. Additionally if automatic you can add an external transmission cooler.
Providing that the temperature does not go into a true overheat condition, some heat buildup is pretty much normal and not to be of concern unless you are pulling a trailer etc. Check what I mentioned and you should be OK.

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Mar 06, 2010 | 2002 Jeep Grand Cherokee

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Mechanic went to change out the thermostat on the 03 Cruiser...drove it back to me..overheated when he got it back...removed the thermostat to see if that would at suppress the overheat problem until the...


Removal of the thermostat from the cooling system is not a good idea. This upsets the coolant flow rate in the system, and that can cause the engine to overheat, even when no other problem with the cooling system exists.

Try to identify the cause of the overheating.

Ensure that engine tune, or other engine mechanical fault condition is not the cause of the overheating, then go through the checklist following:-

1) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok,
2) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle.
3) Check coolant reservoir pressure cap is serviceable,
4) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on).
5) Check for combustion gas bubbles in the coolant reservoir while the motor is running - this indicates a blown head gasket. If in doubt, take it to a radiator shop and ask for a combustion gas check on your radiator.
6) Check condition of radiator core:-
i) for blockage of air flow to (bugs/grass etc),
ii) for core internal blockage to coolant flow,

If all above ok, replace the thermostat again (also ensure it is not installed upside down) - faulty new thermostats are not unheard of.

Oct 20, 2009 | 2003 Chrysler PT Cruiser

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Have an '85 CJ7--put in new radiator and thermostat, new water pump--fan shroud installed, Jeep still overheats, motor runs good, doesn't act like it's a head gasket problem????? Can't figure out why it's...


Take out the thermostat and run it like this for while. If the motor still over heats: Look over by the battery, do you see where those two hoses from the radiator and the water manifold are going into the firewall? Take the hose going to the manifold from the firewall off of the connection at the firewall and connect it directly to the water pump. I think the manifold hose is the one on the right just make sure it's not the one coming from the water pump. You'll have to remove the hose coming to the fire wall from the water pump where it is connected at the pump but, that's OK for now just tie/tape it to something out of the way. Now then, your water pump will be sending water directly to the water manifold without any obstruction. When you run the motor for a little while and find that it stays super cool, I then suggest (if you want any heated air this winter) that you have the heater core (there behind the firewall where the two hoses were going) flushed clean or replaced and hooked back up. Once water can flow freely through the system your thermostat can probably be reinstalled w/ out overheating the motor.

Aug 02, 2009 | 1985 Jeep CJ7

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Have a 1979 cj7 cant find a flywheel with right bolt pattern the motor is a amc 360 but a flywheel from a 360 has a differnt bolt pattern than mine any help please


are you sure you have an amc 360 and not a 304 and also are you sure the flywheel came from an amc 360 and not a chevy 350? A 350 will bolt directly in place of the 360. You might also try a 350 flywheel.

May 10, 2009 | Jeep CJ7 Cars & Trucks

1 Answer

Overheating


Well, assuming that the water pump is turning the correct way, looks like you are going to have to pull the radiator out & take it to a guy who cleans radiator interiors. Seems to me that you may have some sediment built up and the water is not circulating thru the rad. This would explain why the top is warm & the bottom cool with no thermostat. Whilst the rad is out, flush the block with water. See what comes out. Don't use a "flush kit" just yet. In my experience, the flush kits that you buy are not good for this issue, have it done by a pro, but, after he cleans it, then get a flush kit & flush the block anyway. If there is sediment in the radiator (from sitting), there is def sediment in the block.

The timing would have to be WAY OFF to make it overheat.

Sep 17, 2008 | 1984 Jeep CJ7

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