2000 GMC Sierra Coolant Leak

2000 GMC SIERRA
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WALT MESSA
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My GMC Z71 with the 5.3L engine has 136,000 miles has developed a slow coolant leak. at about 130,000 miles I changed the water pump which was original just as a precaution and the thought that it was the cuprit for the slow leak. now 6000 miles later the coolant level is low again. I've read that the DEX cool can deterioriate the Intake manifold gaskets but I see no evidence of a leak on the external portion of the intake nor can I see any evidence in the oil that the gasket has failed to the inside of the manifold. Any suggestions?
Mar 10, 2007 at 2:51 AM
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CHEVY22
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look at the engine , you didnt state what year but 2000 and earlier have an egr valve , if you look right below that on the left or drivers side you may see a leak there or on the rear of the intake around the distributor ,you will need a good light to see either
Mar 10, 2007 at 3:36 AM
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WALT MESSA
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[quote:ae4e958f9d="CHEVYII"]look at the engine , you didnt state what year but 2000 and earlier have an egr valve , if you look right below that on the left or drivers side you may see a leak there or on the rear of the intake around the distributor ,you will need a good light to see either[/quote:ae4e958f9d] it is a 2000 I have not checked the EGR but will do so, thanks for your input.
Mar 10, 2007 at 3:42 AM
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CHEVY22
  • ✓Experienced Mechanic
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im sorry i meant below the egr , but i dont think the 01 have it , but look in that location , drivers side right below center of manifold you can see the front and left side of intake , this is usually where they leak , if its not there or in the rear i would start checking the passenger side carpet for coolant
Mar 10, 2007 at 3:46 AM

Suggested Repair

Inspect the driver's side of the intake below the EGR and the rear of the intake around the distributor with a good light. If no leak is found there, check the passenger-side carpet for coolant.

Conversation Summary

The owner of a 2000 GMC Sierra 5.3 reports a slow coolant leak after replacing the water pump. No external intake leak or coolant in the oil is visible. The expert advises checking below the EGR on the driver's side and the rear of the intake near the distributor, then inspecting the passenger carpet if those areas are dry.

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