Question about Saturn SL1

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I have little heat, top hose is hot, bottom hose is cold. would this be the theromstat? or blockage in the radiator?

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I would start with the thermostat.

Kdog

Posted on Dec 29, 2010

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06 cadillac cts engine hot a/c off


if I understand your problem the car is overheating with the A/C turned off? u may have a bad thermostat or a blockage in radiator. open the radiator cap when car is cold and start the engine. look into the radiator and see if fluid is flowing if its not that's good it means when engine is cold the thermostat is closed. after the car reaches normal operating temp the stat should open and the fluid flow through the radiator. if this is not the case then replace thermostat. if it passes this test then check the top radiator hose to see if its hot then check the bottom hose it should be about the same temp as the top. if it is cold or just warm then u most likely have a blockage in the radiator. if so u can replace it or have it redone at radiator shop. if radiator is ok then look at heater core. when the engine is warm u should have heat. u can use the hose test here as well. the two smaller hoses that go into firewall to heater should be hot when using the heat if not then there is a blockage in heater core.. hope this helps

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Why is my coolant overflowing when my 2006 Chevy equinox heats up?


thet moment stop your engine and grab top radiator hose, feel the heat then grab lower radiator hose they have to be hot same heat. Top hose very hot is radiator blockage, Or lower hose very hot thermostat damage ,for test thermostat tide whith a string or wire have one glass cold water and juck boiling water deep thermostat in and you have to see the opening if is not then you have to replace it. Don ever youse radiator flush with the thermostat on. Blown head gasket means continual air bubble when you remove radiator cap special white froth,check for loose or damage hose and heter leaks when cooling system is under pressure.check low and high rpm exhaust fumes.

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I have a 1994 Jeep wrangler 6 cylinder. I replaced the cooland and therostat and it opens like it should at about 100 but the air is still cold. Is there something I overlooked?


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1995 Dodge Intrepid no heat in cabin. Made sure there is not any air in the coolant system, replaced thermostat and radiator cap. The lower hose that comes out of bottom of radiator is cold. All other...


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You should check for a valve in the heater hoses, and if the vehicle is running cold - below the normal mark on gauge.

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Radiator problems


it may be a little off, but the lower water hose seldom gets very hot,, as its this hose that suplyes the engine with ""cold water"" the hot water comes out the top hose,, drains down the rad and cools on the way down then enters the engine through the bottom hose """if your engine stayes running in the normal place on the gage,,,and not over heating""" why are you spending money for nothing???""
you wont get the bottom hose to run hot unless the engine is cooking

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