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97 eldorado with 48000 mile started overheating yesterday


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Look at the rear of the front cylinder head and make sure the water pump drive belt is still good.

2011-03-23_000042_water_pump_belt.jpg.f8525d5f15fa81b907ca7e417ad6c968.jpg

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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Did you run the engine and observe the belt and pulley rotating?

 

Could be the thermostat sticking or the bypass hose that goes to the coolant recovery/surge tank jar is restricted.

The small hose that goes to the top of the coolant recovery jar can become restricted. When the engine is cool remove the recovery jar/radiator cap, smell the inside of the tank. Does it smell like exhaust? Make sure the coolant level with the engine cold, not running is about 2" below the bottom of the opening. Remove the 3/8" hose from the recovery jar and direct it towards the opening. Have someone start the engine and there should be full flow through the hose. If not you will need to remove the hose and remove the restriction.

To fill the cooling system, be sure to use Dex-cool with a 50-50 solution of coolant and distilled water. You can use good, non-hard, drinkable water or use the premix solution.

Could be something as simple as a defective recovery jar/surge tank cap not holding pressure. The cooling fans may not be coming on. If you don't find a "smoking gun" we'll have to get a lot more information on the symptoms

Edited by OldCadTech

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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Sorry to say and I have seen this so many times. The coolant was probably never changed and dexcool turns acidic! Eats away the head gaskets. But first check the flow of the purge line. 

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