Check the electric radiator fan, if vehicle heats up at low speed then it sounds like the fan is not working! at high speed the air going through the radiator cools the engine. Check the fan out! God-Bless! Hope this helps you. or check to see if you have a bad fuse for the fan or relay is bad and will not turn on fan.
SOURCE: Blazer runs rough when running at 45 to 55 mph
the problem was low transmission fluid. added half a quart and the problem went away.
SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH
impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat
SOURCE: white tail smoke, both temp gauges (oil/engine)
Alright there your on the money there. A4 audi's and The 2liter golfs do haed gaskets at around 145-150,000 miles. the oil's foamy kinda yellowie cream. Tip for ya When you do the head gasket cahnge the rad and water pump at the same time. Mine didthe same it's costly but worth it for piece of mind, Plus is the only time you get to the water pump apart from changing the timing belt.
SOURCE: Vibration while accelerating from 30 to 45 mph Jeep GrandCherokee
Not a tune up problem,
You need to have all U-joints checked out,They will give you the vibrations only while acceleration
Testimonial: "Perfect, Wasn't sure if it was the right solution but I got them fixed and problem stopped. Thanks."
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