Question about 1995 Isuzu Trooper

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Using water and top hose is realy hard like it is under pressure but no water in the oil

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  • Richard Scordino May 11, 2010

    Have you checked anything yet? As a last resort, remove the valve cover...even though you said no water in oil, those heads used to crack somewhere near the center , in the cam galley. (shows up as minor seepage under pressure)



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A reed896: There are a number of potential areas which will cause the symptom you describe. Areas to check:
1.Prior to starting, inspect the sealing surfaces of the radiator cap for cracks in the seal. Old caps will not keep the pressure in that well, consequently it causes coolant to blow out into the expansion tankwell below what the cap is rated for. Because the cap is bad, it will not function as it was designed where as it cools off, the coolant is drawn back into the radiator from the expansion tank.Top off the radiator, but leave the level about 1/2 inch below the neck but not to the top of the radiator if possible.
If the cap is in poor shape, replace it before proceeding.
Put the cap back on the radiator and position it in it's normal locked position. Start the engine and run it for 30-45 seconds then shut it off. Carefully open the radiator cap. If there is pressure in the system, this is not a good sign. Close the cap again and run the engine for a little over a minute and recheck it again. If your findings are the same, but it seems as though the pressure has built up noticeably more, you probably have a blown head gasket.
Head gasket failures don't always put water in the oil. It depends on where the gasket has failed.
2. If no problem is found, proceed with the next test. Start and run the engine and wait for the thermostat to open. What you are looking for is the top and bottom hoses will both be hot. The radiator will also feel hot and uniform in temperature across the entire surface. If after a few minutes the thermostat has not opened, only the top hose will remain hot while the bottom will be cool. If this is the case, you have a bad thermostat and it needs to be replaced. Typically if a thermostat does not open, the pressure in the cooling system will build rapidly after a few minutes and the top hose will appear to be very hard because of the pressure build up. The lower will also be relatively hard as well.. but it will be cool to the touch.
Look at these things first and if you come up empty, I'll lead you on to the more complicated testing.

Posted on Apr 20, 2009


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cooling system or engine AND/OR personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system or reservoir, use extreme care when removing the pressure relief cap from a hot cooling system or reservoir.
  1. Wait until the engine has cooled.
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Check this procedure to how to replace a water pump (DIY Complexity: Moderate / Time: 3.5 hours):

1. Water Pump

1. Screwdriver
2. Scraper
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5. Needle Nose Pliers
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Step 1 With the engine off and cold, open the hood and locate the vehicle’s water pump.
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Step 2 Remove the radiator cap.

Step 3 Install cooling system pressure tester. Apply the pressure indicated on the radiator cap or in the owner’s manual.

Step 4 Inspect cooling system components for leaks.

Step 5 Place a drain pan under the radiator. Open drain valve or remove the lower radiator hose to drain cooling system.
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Step 6 Remove the drive belts or serpentine belt.

Step 7 Remove any hoses connected to water pump.

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Step 10 Install new water pump and new gasket. Tighten bolts to manufacturer’s specifications.
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Step 11 Re-install any hoses and belts that were removed.

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Step 13 Refill radiator with a 50/50 mix of coolant and distilled water, then pressure test the cooling system and check for leaks.

Step 14 Fill overflow reservoir with same mixture.

Step 15 Leave the radiator cap off, start engine and let it idle. You should see the system“burping” bubbles of air. Refill the radiator to the top.
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Step 16 Install radiator cap.

Step 17 Road test vehicle, keep an eye on the engine temp gauge if vehicle runs hot, there still might be an air pocket in the cooling system. The cooling system should be topped off after vehicle has fully cooled down.

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