Questions and Answers

Chevrolet Tahoe Poor Design? Q. The vehicle is a 1996 Chevrolet Tahoe with a computer controlled, fuel injected 350 cu in V-8 engine and 85,000 miles. Automatic transmission, A/C, ABS brakes, cruise control and power steering. The problem occurred when I saw wet spots under the car that turned out to be coolant. The coolant overflow tank required filling occasionally.

Inspection for leaks with a coolant pressure tool revealed there was a leak but I was unable to determine the source. A discussion with a mechanic who was more versed in modern engine system than myself suggested that there may be a problem with the intake manifold gaskets leaking at the water passages. This is what the problem turned out to be.

I replaced the intake gaskets (not an easy job) and this has eliminated the coolant lose. I am perplexed that GM has such a poor design that would allow this to happen! I want to prevent this from happening again on my vehicle. Do you have any information that would help?

Dick

A. Sorry but they are all leaking!! Not sure if it's a poor designed gasket or faulty installation by the factory (over torqued?). Did you follow the proper torque settings with the special locative on the bolts? If not, you may be doing it again soon. These are low clamp load gaskets & they want the bolts glued so they don't back off.

Also they have had problems with the quick connect fittings on the intake rotting off. Another place is if you have rear heat is the hot water shut-off valve under the air cleaner assembly.