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Fletch,
Dont worry there are a few things that can be wrong. On my way to Sacramento I had the car going at 4500=115 mph in Drive for about 20 minutes. I was the only one on the freeway so I figured I would give it a try. That car has such a good cooling system it should stay in the middle no matter where you go and how hard you run it.
1. What type of coolant do you use. If you mix coolants like OE volvo (The blue coolant) with prestone, when the two get hot they get thick and plug up the thermostat thus letting the car over heat. I have always used distilled water and the Blue volvo coolant. I is $15 a gallon but it works. I have heard that other coolants are bad for the cooling system.
2. Your thermostat might be stuck mid way. Meaning that under hard driving conditions your car is not really cooling itself as well as it could. Its easy to replace. all you need is a torx rench and the $10 thermostat from the dealer.
3. are you still loosing coolant? IF so you could have a head gasket problem. Open your expansion tank after the car has hit normal opperating temperatures. Does the fluid spew out as if under really high ammounts of pressure? While doing this look at the rear of the engine and check that those two hoses arent leaking. This can also cause a leak of fluid.
One last thing. Check your engine oil level is it low? This helps cooling a little bit. Not a significant thing but still someting worth looking. Does your cooling fan work? This also helps cooling.
If I were you I would replace my coolant and thermosat right away. Then Try the abe crombie tune up. When you do this leave your car in drive till you hit over 30 mph then put it in low. This locks your car into 2nd gear and not 1st. Hope this helps. please feel free to ask questions.
Brandon 96 960
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