coolant leak
55

Asked by wald0069 Sep 14, 2016 at 06:47 PM about the 2003 Pontiac Grand Prix GT

Question type: Maintenance & Repair

I have a small amount of coolant on the ground between the back of the engine and the firewall.  Pressure tested, no loss of pressure with the tester on all day.  Not intake manifold, just replaced the gaskets.  Not the elbows.  Not a freeze plug.  It leaks when the car is cold.  If it is warm or running, it doesn't leak.  The drip is coming between the oil pan and the transmission fluid pan.  I've checked hoses.  Car does not over heat, just noticed small amount on drive.  Maybe a few tablespoons.  

4 Answers
55

wald0069 answered 7 years ago

Sorry, forgot to provide info. 2003 Pontiac grand prix, 3.8L, not super charged

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KenF answered 7 years ago

I would isolate the heater core and test that individually. See if the puddle is near the drain tube from the heater core box. You may have a tiny leak in the heater core that is dripping out the drain tube to the ground. When the engine is running and everything heats up the leak seals.

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55

wald0069 answered 7 years ago

It's not the elbows, replace intake upper and lower gaskets. Gaskets are metal. Coolant collects on a bolt between the tranny and oil pan. Where are knock sensors located?

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wald0069 answered 7 years ago

Seems like the only way to see the leak is to drop the tranny. What are options? Freeze plug? Rear seal? Anything else?

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