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2005 chevrolet z71 loosing coolant with no sign of leaks

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Check the waterpump. You need to look from underneath for signs of leaking. Also check the radiator along the edges of both tanks. Lastly, check the aluminum coolant bypass fitting on the rear of the intake manifold as well as the intake itself in the very back. Th fittings always leak and usually break in half when you try to remove, then you have to drill it out and tap the threads on the intake.

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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Chevy 2005 cavalier low coolant light keeps coming on and the coolant reservoit tank is empty after only 200 miles. what is causing this?


  1. Check the hoses and clamps going from the reservoir to the radiator and from the radiator to the engine. Make sure they are flexible and in good condition.
  2. Check the reservoir and radiator for leaks.
  3. Replace any parts they may be failing. If no leaks are found proceed to next step.
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Thermostats on I-4 and I-5 Colorado's are very straight forward, the thermostat and the housing are a single unit. Thermostat housing is sealed by a rubber seal and is held on to block by two bolts. Procedure is as follows

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2. disconnect top hose from thermostat

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4. install new housing, be careful to not overtorque, block is aluminum

5. connect top hose and close drain petcock

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8. if no leaks are detected, allow engine to reach operating temperature. shutdown and allow to cool completely, verify that coolant level is correct.

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Check the coolant level in the rad and reservoir. If its low most likely a leaking intake gasket. top it up and recheck. If leaks when running the waterpump is most likely leaking. They also have issues with blown headgaskets loosing coolant, (but generally runs very hot).

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I have a 2005 suzuki forenza.. I loose coolant like its nothing no signs of leak.. Low rough idle..I replaced the plugs and wires and 02 sensor Engine light flashes at idle and stops flashing but remains...


Check your oil----is it very high? Put a piece of cardboard under your car overnight, see if you have any leaks externally. If not, then you have an internal leak, which indicates a blown head gasket.

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Please have an expert examine this for you but I bet it is the CVC joint too.

Fix it fast enough.

Rate this please

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