Question about 1999 Chevrolet Blazer

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I have a 99 Blazer 4X4 LS 4.3L Overheating- coolant leak.

I have a 99 Blazer 4X4 LS 4.3L With no warning, began to overheat especially with A/C on. There seems to be a leak behind the A/C compressor. Steam and hissing. Could it be the compressor?

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  • dhuntz123 Oct 06, 2009

    How difficult is it to change the lower intake gasket?

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No, the lower intake is leaking(common fault with 4.3)will have to get lower intake gasket changed,there is an up dated gasket for ths from FEL PRO

Posted on Oct 05, 2009

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It can be faulty coolant temperature sensor.Its not sensing exact coolant heat temperature so its overheating then required level.

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Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.


Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help links mentioned below :----

Click the link below :-----


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