Engine Cooling problem
2001 Pontiac Montana 6 cyl Front Wheel Drive Automatic 108000 miles
The story goes like this. I have noticed that the brakes are " mushy" feeling on my Montana. Changed pads and shoes, replaced both wheel cylindars and bled the lines. Refilled the resevoir as needed during bleeding and after. Also, have had an ongoing CEL code for an O2 sensor, and have replaced both O2 sensors on the van. Took vehicle to mechanic to have the customary oil change at 3k miles. This by the way is a new mechanic whom I have not used before. While checking other fluids in the van, he directs me to come and look at the radiator to witness all the sludge after he removed the radiator cap. This is a dark brown color and thick as red clay mud you would find in the south. He then goes on to tell me that this is typical of Pontiac V6's having a cracked intake manifold gasket. I understand that both the 02 sensor and mushy brakes could be due to a vacuum leak of a cracked intake manifold gasket; but I didn't mention either scenario with the mechanic. Can the intake manifold leak cause a problem with the cooling system like I have described. There has been no issues with power loss or poor running of the engine. I plan on flushing the system first thing in the morning, but should I seriously look into having the intake manifold plenum gasket replaced?
Sunday, November 15th, 2009 AT 8:28 PM