Engine:Series III 3.8L
The car is losing coolant and the local garage can’t find anything wrong.
Here’s the symptoms of the issue, the temperature gauge climbs over the half mark on the needle to where the fans are going crazy and the car needs to be turned off letting it cool down to prevent any damage.
We also keep filing the overflow tank too.
The local garage did a coolant test and found nothing wrong, they did a freeze test among others. they said the head gasket is fine, they said the water pump doesn’t leak. They even ran the car on the hoist and nothing was leaking.
We are hoping the local dealer can help, they are going to use the dye method to help find the leak something the garage didn’t use.
Didn’t GM fix the Series III 3.8’s with the intake manifold issue?, there’s no coolant in the oil either? I personal think it’s the water pump leaking or the heater core inside the car. We used to always hear a wish wash noise in the passenger area but that has now stopped with the over heating issue above started.
We are just lost on the issue and the near overheating concern.
hoping some members can lend advice.