Question about 1984 Jeep CJ7

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Overheating i have a cj7 with an amc 150 new water pump no thermostat there seems to be water circulation at radiator but engine overheats within 2 min jeep sat for a long period i have also disconected all hoses and seem to have circulation what i need is a circulation diagram so i know that all hoses are hooked up correctly and which direction the water is supposed to circulate thankyou robert stevens

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  • Crowstorment Sep 17, 2008

    no i have two v belts one for power steering one for the alt i also have hoses that go from the heater coli to the intake manifoldand from the manifold to either the pump or the thermostati dont see an R anywhere where would it be and thanks for responding this is a real delemmma

  • Crowstorment Sep 17, 2008

    yes its an amc 150 4 cyl as ive had the water pump off several times i just have water in it at the moment warm at the top the water itself the raditors warm all over not hotas i said the vehicle sat for quite some timei also read the timing might have something to do with this problem is that possible the waters slightly rusty in color but not severly

  • Crowstorment Sep 17, 2008

    thanks again for your help the jeeps goin in the shop to have new eaf springs shocks pitman arm drop sway bar drops ext brake lines ill have the mech flush out the block and go ahead and buy a new radiator as i dont want to have issues on the side of thr road somewhere in the future once again thank you very much for all your time and help props to you and your web site thanks again

  • Toyota Ed May 11, 2010

    OK, we need to dig deeper here.

    First, what does the coolant look like? Is is rusty coloured?

    Second, when you start the vehicle up, and 2 minutes later it overheats, shut it off, and feel the temperature of the radiator. Is it warm at the top/cold at the bottom; cold at the top/warm at the bottom; all warm/hot; or all cold?

    The "R" would be on the back of the pump, facing the engine block.

    Is this a 4 cylinder CJ?

  • Toyota Ed May 11, 2010

    Question: Does this vehicle have a serpentine belt that drives all of the accessories? If so, you may have the wrong water pump. The serp belt drive pumps turn one way, and the regular style pumps turn the other way. If you have a serp belt, the pump should have an "R" on it, for reverse impeller flow. If you have a "R" on the pump, and regular pulleys, the water goes the wrong way.

    Regarding the hoses: It should not matter how the heater hoses are hooked up, when it comes to an overheating issue.

    Check it out & get back to me.



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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

  • Toyota Ed Sep 17, 2008

    You are very welcome.



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

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Engine overheating

check for water coolant circulation. either you might have a clogged radiator or faulty water pump. to check the radiator after you run the engine for a while switch it off and try to find an easy access to radiator vents and touch all surface to see whether is all ho or if is some,then you remove it and send it for cleaning. as regards water pump,take the thermostat out put water in and start the engine follow the water circulation when you rev.if it rotates the water pump is working if is steady and coming upwards to over flow then the water pump is faulty. Also the other possibility is the matrix to be clogged..

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Took out the thermostat, replaced the radiator, the water is circulating in the radiator but it is still running hot. what do i do next?

Overheating can seriously damage a car's engine if left unchecked. Although overheating simply means that a car's engine temperature exceeds normal operating temperatures, the causes of overheating are varied. What follows is a brief list of some of the most common causes of engine overheating.

    Faulty Radiator
  1. A car that overheats will often have a faulty radiator. A radiator is responsible for cooling hot engine coolant that picks up heat from inside a car's running engine. A radiator "radiates" the heat from engine coolant out into the outside air. A faulty radiator loses its "radiating" effects and allows engine coolant to become overheated, thus rendering it ineffective at adequately cooling and engine.
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  3. A faulty or malfunctioning water pump prevents adequate engine coolant flow and can cause a car to overheat. A water pump serves to pressurize and propel engine coolant throughout a car's engine and radiator to increase the heat-reducing capabilities of engine coolant. A faulty water pump loses its ability to adequately pump and propel engine coolant, and can cause a car to overheat.
  4. Coolant System Leaks
  5. A leaky engine coolant system reduces the level of circulating engine coolant, which increases engine temperature and leads to engine overheating. Radiators, water pumps, and coolant system hoses and seals--all of these coolant system parts can develop leaks, which can result in low coolant levels and engine overheating.
  6. Faulty Thermostat
  7. A car thermostat regulates the flow of engine coolant. A thermostat is a heat-sensitive valve that opens when a car engine reaches a set operating temperature and closes when a car engine is cold and warming up. If a thermostat gets stuck in the closed position, coolant will be prevented from reaching the engine, which will quickly lead to engine overheating and potential engine damage.
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1 Answer


Most people think of this is a common problem of the thermostat. To make sure it is not the only problem, run your car a day or two without the thermostat to make sure it is not overheating anymore, then put in a new thermostat. Your problem is solved.
However, if your engine still has overheat without the thermostat, then there is a problem with restriction of coolant circulation through the engine from 3 followings:
1- Radiator clogged up.
2- Water pump is bad.
3- Water jacket is clogged up.
A shop can easily determine if the water pum bad or not.
Make sure to find a reputation shop since a yo-yo shop can change your water pump first then later on determine the clogged up radiator is the culprit while you are not actually needing a water pump at the first place. Why, a good water pump still causes overheat since the radiator is clogging up. My advise is not to use a rebuilt radiator, go with a brand new one. It can last you 10 years instead of 2 years on the rebuilt one. Good luck.

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1 Answer

Even after replacing the radiator, thermostat and

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Car is overheating, thermostat was changed and the radiator was flushed, car does not overheat while idoling, but when you start driving it overheats

It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water through the engine block and cylinder head and back through the radiator. In the radiator the mixture is cooled when air passes over the fins of the radiator. This is accomplished by driving or a mechanical/electrical fan when stationary. The water pump also circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving.
I hope this helps and good luck!

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