Have a 1.8T only overheats on really long steep hills at about 3k altitude...as soon as going downhill ...temp back to normal ....had the
water pump done (twice) and thermostat....someone suggested air bubble might have happened when water pump??? not done under a vacumn or something....clutch fan ?? any ideas anybody
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Re: overheating on long steep hills
Hi. It is a well known problem on VWs you need to let all the air out , your car should have a valve to do this but if you can not find it try leaving the antefrezze cap of and watch for bubles coming out the water ( with the engine runing ,, ) cold
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A few ideas. 1) Try the motor home where you are now and see. Find some REALLY steep hills or something and try it out. 2) If it is an automatic transmission, you may need to purchase a "transmission cooler" kit to add on before you try mountain climbing. 3) If it is a stick shift, take along another clutch disc and pressure plate and throwout bearing in case you burn yours up. 4) And remember, cars and trucks that normally operate at sea level will not do well in high mountains. They need to have the timing and/or carburetor set for high altitudes. 5) Many countries outside the USA have different octane ratings on their gasoline, you will need to take along the stuff to set your engine to the octane rating of the gas you buy. Be blessed
Have you checked to see if the cooling fans are coming on? Is the coolant level low? Could also be a weak water pump. Does the temperature gauge appear to work normally or do you go from low temp to high temp and then back to low rather quickly? If so, it could be a bad thermostat.
check the coolant temp sensor , fuses , relay and fan for operation if electric fans
if manual fan replace the viscous fan hub
have a pressure test done on cooling system to check for cracked tanks or other leaks
over 5 years old and never changed the water conditioner (antifreeze/boil concentrate ), consider replacing the radiator
be a plugged up radiatorsystem, timing to high and now days a shop has to set it. bad water pump not pushing water flow fast enough. Best to got to shop Kias are just one bad car sorry but we hate them here in the dealer shop.
dear friend-it sounds like you are having a circulation problem,when the engine has reached normal working temp feel the two radiator hoses they should be the same heat,also check the water pump to see if the impeller is not loose,it is not to say that the radiator is clean after a flush,it must be opened to clean.
Your problem could be anything from Dirty air filter/Loose fanbelt/Thermostat sticking/Full throttle over fueling on pump/or air in Water system (somecars have to be bleed thats removing air from radiator and engine) check your book for that.
All Toyota auto trans cars downshift when descending a hill when you tap the brake. This is called "Downhill Shift Logic"; what this is for is to eliminate the double shift when you come to the bottom of a hill and then accelerate. Normal condition. Usually happens above 38 MPH.
Also: The cruise will accelerate when going uphill. Normal condition.Plus: The cruise will not disengage back to the set MPH after you top the hill. Toyota recommends to disengage the cruise when encountering steep terrain.