Question about 2000 Hyundai Elantra

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Overheating I have replaced the thermostat. The top coolant hose gets hot the bottom hose stays cool. Not circulating? Not sure what to do next. Thanx.

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Hi Dwight, sometimes a new thermostat can be faulty,it is easily checked by simply boiling in a pot of water for example if the thermostat opens at 180 deg once the temp is there you can visually see it open, also check the water pump for seepage you might not have the circulating volume required (cavitation) another option would be to check the coolant temp sensor,I doubt the radiator would be so bunged up it would not circulate but it has happend. be aware that if you flush your system read carefully the specs of your product as some products are ******* pump seals etc hope this will be of some assistance to dwight good luck

Posted on Nov 10, 2008

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I have a 2000 Bmw 323 I that is having a overheating problem what would be the cause of the overheating problem a thermastat a water pump or a radiator flush


Could be any or all three or a bad cooling fan. I'd start by replacing the thermostat since they are dirt cheap. After replacing the thermostat warm the vehicle up and feel the upper radiator hose if its hot the rhe thermostat opened and the water pump is circulating coolant next check the radiator it should be hot near the upper radiator hose and significantly cooler near the lower with an even heat distribution if any parts of the radiator dont get warm/hot then you radiator is plugged. Also you need to check the operation of the cooling fan with the engine warm turn on your ac that should immediately turn the electric fan on

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I have a 2002 1.4 vw polo overheating. The temp gauge just keeps going up. I have no hot air coming through the vents and the bottom radiator hose stays cold but all other hoses get hot. The car was fine...


It's not likely the thermostat as they tend to stay open when they go bad; but you have no circulation when the lower hose remains cool. Most likely it's too low on coolant for circulation or the water pump is failing.

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Jul 17, 2011 | 1999 Oldsmobile Alero

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Car is overheating, heater not working, fluid levels ok. Found pinhole leak in upper radiator hose and fixed, yet car overheats. What can I do?


Are you getting propper curculation through the radiator?Remove radiator cap (cold) start car and inspect, put cap back on and allow it to warm up. After the engine has reached normal opperating temperature check to see if the bottom radiator hose is getting hot.Does it have electric colling fans? If so make sure they are comming on when the engine gets hot. If not make sure all fuses and relays are OK.A radiator core blocked or restricted or dirty can cause over heating. Afaulty thermostat can cause over heating.If the heater is not working then the engine is not circulating the collant properly. and the watter pump could be no good.If the bottom rad hose does not get hot then there is no circulation and the watter pump is no good..It could be a faulty thermostat.If the upper rad hose stays cold after the engine is at normall temp replace thermostat.Do not run engine to boiling over point or serious engine damage may ocure.Incorrect ignition timing can also cause over heating. Myself I think that the bottom half of the radiator froze up on you. or the water pump is no good. Please let me know the end results.Good Luck and have a good XMASS.

Dec 14, 2010 | 1999 Chevrolet Malibu

1 Answer

I put on new water pump.Motor still gets red hot.could it be rad.


You need to make sure the coolant is circulating. Check to make sure the top and bottom hoses are hot and firm to the touch. If the bottom hose is not hot and firm the water isn't circulating which means the thermostat is stuck in the closed position. Also check to make sure the radiator isn't clogged or doesn't have to many crushed fins that prevents the air from properly cooling it.

Aug 24, 2010 | 2001 Pontiac Montana

1 Answer

Overheating


Overheating can be caused by several things including low/no coolant, blocked/broken hose, faulty water pump, stuck thermostat. CHeck the coolant level in the over flow tank and in the radiator itself. If it's low you know you have a leak somewhere. If it's full you know the coolant isn't circulating through the system.

Let the car run until it heats up then feel the upper and lower hoses on the radiator, they should both be hot and firm when the coolant is circulating. If the top is hot and the bottom is cool and pliable then you know the coolant isn't going through. The most common cause of this is a thermostat that isn't opening. Look to make sure the water pump is operating properly, that's what circulates the water through the motor.

If you suspect a leak then you need to find where it's coming from. Check around the head/intake gaskets for signs of leakage as well as around the side tanks on the radiator and all hoses and connections.

Start with the small/obvious things first and progress from there. Good luck.

May 23, 2010 | 1994 Cadillac Eldorado

4 Answers

1991 honda accord is overheating. Installed new radiator because of leak and the car started overheating because of cracked heater hose. Installed new hose and still overheating. Bottom radiator hose is...


When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

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Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
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1 Answer

Radiator overheating


The only thing missing from your narration is the water pump. Check to make sure that you are not losing coolant from the water pump. Make sure it is not leaking coolant. If there is evidence of leaking, the water pump is bad. You must take extreme caution when dealing with the cooling system (hot liquid under pressure; not a pleasant thought), but you can remove the radiator cap and start the engine. Check the coolant in the radiator for movement/circulation. If the water pump is functioning properly, there should be some visible sign of water/coolant circulation. The water pump may not be at fault, but with the other upgrades you made to the cooling system, some gunk (for lack of a better word) may have broken loose and clogged the ports in the water hose. You can also remove the hose at the water pump and check for anything clogging up the works. Really sorry for your trouble and I hope this helped. Best wishes.

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