Question about 2003 Oldsmobile Silhouette

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I'm installing a Prestone coolant flush kit and need to find the heater inlet hose. Which one is it?

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With the engine running it is the hottest one, it is also the largest of the 2 small heater core hoses going to the firewall from the engine.

Posted on Aug 21, 2010


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Im trying to flush the cooling system on a '97

Not positive about that engine, but the usual method is the heater inlet will come off the cylinder head somewhere and to the firewall, and the heater outlet (the return hose) will be at same place on the firewall and go to the water pump, very close or at the fitting where the lower radiator hose attaches to the water pump inlet.

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I'm guessing you have something like the prestone flush/fill kit. I have never had much luck with those. (They leak and get parts of your engine wet that really shouldn't get wet.) I just drain the coolant, refill with water run the engine with the heater on full blast for about 5 minutes, drain again, repeat untill clean water is coming out then drain and refill with pure antifreeze. Usually there is enough plain water left in the enigine after the last drain to get the mix about 50/50. You can check it with one of the float type testers to make sure it will handle the coldest temps for your region.

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1995 Gran Am 4 cylinder. I want to back flush my cooling system using the Prestone ''Flush 'N Fill Kit. Where do I insert the Tee? I do not know which is the radiator inlet hose as this is where Prestone...

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determine which one is the inlet hose. It is further away from the water pump housing so that when you backflush through it, it also flushes out the heater core.

Hope this helps.

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How do i install a Prestone flush kit in a 2003

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Buy a Prestone coolant flush kit.Now you have the adaptive connectors to connect your heater hoses.Cut the hoses to length neede and connect the two together,Bingo..bypassed.

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