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I have a 98 jimmy. 4W drive, 4.3. I have coolant leaking along the driver side of radiator. it runs off the skid plate and it seems to run off more when running. heat works fine. no coolant in oil. upper hose stays cool to touch.

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Step 1:

You first need to make sure your thermostat is opening, because your top hose should not be cool to the touch if it has been running for awhile.
When the vehicle is cold remove the radiator cap and fill with fluid. let it run, you will loose some of the anti freeze when the thermostat opens. When it does you will see the fluid flowing through the radiator. If it starts to bubble out all over the place then you need a thermostat.

Step 2:

If you need a thermostat then change it or have a shop do it for you.
The leeking could just be your overflow hose.
you can then check your radiator with a pressure tester that you can usally rent from stores like advanced auto or other parts places. If you find you have a hole in your radiator, then you have 2 options. 1 try sealing it with over the counter radiator sealant or replace the radiator.

Posted on Jan 01, 2013

  • gary Jan 01, 2013

    well i was able to track the leak and it appears that it's dripping from where the thermo housing is. so i'm hopeful that the leak is some sort of overflow thing. it also seems to intensify as pressure builds.


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Replace thermostat.

Posted on Jan 01, 2013

  • gary Jan 01, 2013

    ok. so what is causing the leak? does the coolant have nowhere else to go? will i still have a leak to deal with after. thanks so much

  • Thomas Perkins
    Thomas Perkins Jan 01, 2013

    Is your water pump leaking?you can follow coolant to see where leak is coming from,need to find leak first.



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SOURCE: Coolant filling up overflow bottle

You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

Posted on Oct 30, 2008

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SOURCE: 98 dodge dakota slt 318. no heat, low operating temp

First thing first, turn off the engine wait for 15 - 20 mints, open the radiator cap and fill it up to the top then start the engine and see if it needs more water adn add as needed, then wait till you ca see the water circulating in the radiator now instead of corculating if it starts boiling out shut the engine replace the thermostat and do the whole thing again.

unless there is water in the engine the gauge will not be able to show the actual temp of the engine, so always malke sure you have water / antifreeze

Posted on Nov 15, 2008

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SOURCE: 1998 Dodge Durango no heat when using heater.


Posted on Jan 08, 2009

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SOURCE: 1996 Jeep cherokee, leaking coolant when cold/ hot ok.

waterpump houseing/shaft seal is on the way out hence the water/coolant, running along the block. when hot the seal does so, when cold and depressurising seal doesnt.

Posted on Jan 25, 2009

  • 102 Answers

SOURCE: coolant leak from left side of engine block running down oil pan.

when you say left side are we talking passanger side or drivers side if drivers side which is my guess most likely your waterpump seal is leaking

Posted on Mar 22, 2009

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