Question about 2002 Oldsmobile Bravada

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Engine squeals and rattles until it warms up to 210 degrees. Really bad after it rains or cool morning during any season. What could be causing this

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  • Oldsmobile Master
  • 22,095 Answers

Fan belt and new tensioner

Posted on Aug 22, 2010

  • knockamechi2 Sep 22, 2010

    Had it check it , not belt and tensioner . I'll try to record the sound and upload it. it soming from the engine more the the fan and belt up front

  • Colin Stickland
    Colin Stickland Sep 22, 2010

    if you can so i can hear it then i can tell you exactly what it is ,

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The radiator cooling fan runs constantly is A/C mode in order to disperse the extra heat from the condenser. With the A/C off the coolant fan should come on only when the engine temperature reaches about 210 degrees, and then only cool the system to about 190-200 degrees and shut off.
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The temp reading on the dash is a very big clue... Likely the thermostat (at the end of the large top radiator hose inside the metal housing) is stuck open. When that happens, the coolant in the engine never reaches full temp. Not only can that result in a low heat condition but it can also give you poor fuel mileage as the computer always thinks the engine is cold and therefore it adds extra fuel to keep it running.
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Hi, i have a toyota fielder 1.8cc with a some problem which has now come up. when i switch on esp in the morning after staying overnight, it produces some really annoying sound from the engine. when the...


If it is a 'squealing' noise it's probably the alternator/power steering drive belt. Before you turn on the engine in the morning, lightlt smear or spray some oil on the inside of the drive belt to lubricate it. If the squealing stops/disappears, then that's the fault ..

That squealing noise can be caused by an incorrectly tensioned belt, or a worn belt. Replacement is the only option.

The other frightening sounds can best be described as 'rattles' or 'tapping'. When a car stands overnight all the oil drains back into the sump (oil/pan).

There are two things (usually) that can be cause the rattle/tap:
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A 'bottom end tapping' is a symptom of worn big ends (they are bearings at the bottom of the piston and fit around the crankshaft).

2. A rattle/tapping from the top of the engine can either be a worn camshaft or 'lazy tappets'. Again, when the engine warms and oil gets to the camshaft and tappets (also called 'hydraulic lifters) the noise will disappear.

If your car has this rattling/tapping noise - identify whether it is coming from just under the rocker box (ie the camshaft/tappets..) or the bottom end of the engine (big end bearings).

If the noise is coming from the top of the engine, try an oil change with a can of thick 'additive' included. A lazy tappet (lifter) isn't too much to worry about. A worn camshaft will affect the performance of the engine, though continue to do its job. An oil change with an additive included may help in quitening things down.

A bottom end tap/rattle (or 'knock') - the sooner that is sorted out the better.

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Truck starts and runs great, but if the temp gets past a certain point it starts acting like its starving for fuel then dies. after 30 minutes or so of cooling down it cranks and runs like there was never...


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