86.5 7MGE Problems

Bill UK · 09-30-2009, 09:36 PM

I've often wondered about that myself, removing the cap and looking into the rad doesn’t tell you much. I guess you need some method of measuring coolant flow through the system. The reason I mentioned the water pump is I got caught out once; I had the usual over flowing expansion tank bottle, gurgling behind the dash noise and over heating. Did a BHG repair and drove it for about 10 miles down the road, opened the hood to find coolant overflowing from the expansion tank bottle. To cut a long story short, I removed the water pump to find the impellors had disintegrated due to the acidic condition of the coolant from previous BHG over the years. Combustion gases mixed with the coolant will start etching the metal parts such as water pump impellors. As you can imagine I'm a bit paranoid about water pump corrosion now.

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09-30-2009, 09:36 PM	#4
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	I've often wondered about that myself, removing the cap and looking into the rad doesn’t tell you much. I guess you need some method of measuring coolant flow through the system. The reason I mentioned the water pump is I got caught out once; I had the usual over flowing expansion tank bottle, gurgling behind the dash noise and over heating. Did a BHG repair and drove it for about 10 miles down the road, opened the hood to find coolant overflowing from the expansion tank bottle. To cut a long story short, I removed the water pump to find the impellors had disintegrated due to the acidic condition of the coolant from previous BHG over the years. Combustion gases mixed with the coolant will start etching the metal parts such as water pump impellors. As you can imagine I'm a bit paranoid about water pump corrosion now.