![]() Judging from the information on the internet, it seems other manufacturers have run into problems with this coolant (catapillar, cummings ® is an online automotive complaint resource that uses graphs to show automotive defect patterns, based on complaint data submitted by visitors to the site. In my opinion, the fault lies with texaco and others who made and manufactured the dexcool coolant used by GM. I have saved all our receipts for the aforementioned repairs in hope that GM might have a recall for these problems. We are the second owners of this van and bought it from the repairing dealership as a program, used vehicle with 20,000 miles on the odometer. Our car began to lose coolant and then the oil began to look orange and finally the coolant was dripping on the ground. He seemed to have seen a lot of the same problems from other owners. The service manager knew exactly what was wrong as soon as I described the symptoms. The cost of those repairs was in the range of $1,000 and was done in a very satisfactory manner by the dealer. We had to have the water pump replaced also and have the cooling system flushed at the same time. I had a local GM dealer repair the intake manifold gasket on our 1999 Pontiac Montana in Dec. We feel that GM should stand behind these problems. They told us that they have never heard of such a problem. We did call the Pontiac customer service center in Michigan and filed a complaint. We did call the dealer who sold us the van and they told us to call Pontiac. We now will have a good chance of spending $2000 - $2500 on a new engine because of the coolant in the engine oil. He also told us that because of this some of the coolant spilled into the engine oil. He said that GM dealers in the area told him that it was due to the manifold being made of plastic and the fact that GM uses dexcool coolant, which eats up the plastic and the gaskets. He told us that this was a common problem with this type of engine. He told us that the plastic upper intake manifold and the gasket was bad. ![]() Then again in November the light came on again so we contacted our personal mechanic since the vehicle was no longer under warranty. In September of 2002 (~53000 miles)we noticed that the low coolant light came on. My wife and I own a 1999 Pontiac Montana. (transmission problems while still under warranty, air bag light came on intermittently, identified as an open circuit in the passenger seat belt pretensioner difficulty making left hand turns at low speeds.) We traded the van in June, feeling the Montana didn't have a good track record after all of the repairs we'd made. There was also tax and a 10% charge for shop supplies/waste disposal for $15. They recommended replacing the lower intake gaskets and did so on the 8th. The same problem seems to have continued, would like GM to extend the recall to cover the '99 Montana's Novemupdate:low coolant light came on and I had it inspected at harry's Pontiac, 819 patton ave. Steering-hard left turns at low speeds, evaluated and service dept (GM) stated no current recalls for the '99 Montana, the recall ended with the '98 Transport. Engine-low coolant light evaluated and found to have faulty intake gasket-repaired, would like GM to cover under recall, service manager stated "it happens alot more often than GM wants to admit in the 3.4 and 3.8L engines in searching recalls, noted several petitions with same complaint.
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