Question about 1999 BMW 318 ti

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What can the problem be please

Why is the lower water pipe cold and the top one hot,she keeps overheating even if I fill up the water,the radiator is not blocked,i did put in a brand new waterpump and the problem is still there.any idees please

Posted by Anonymous on

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  • BMW Master
  • 1,059 Answers

Your thermostat is stuck in close position
change thermostart
water is not circulating as thermostat not opening

Posted on Aug 09, 2016

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Posted on Jan 02, 2017

johnjohn2
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SOURCE: 1991 bmw 318is 4 door 16 valve motor, runs hot and radiator cold

you may have bad waterpump,the impeller on pump may be borken, just because it doesnt leak doesnt mean its good.also could have exhaust entering cooling system (bad headgasket) if pump is good have a block test done.

Posted on Sep 29, 2009

  • 437 Answers

SOURCE: overheating: 1999 bmw 323i m series 2.5

the water pump and thermostat should have solved it. an air pocket can cause that but usually not to that degree.

don't get one of those cheap *** plastic impeller water pump for sissies. Get the metal impeller one. get a cool running thermostat and drill two 3/16" holes in it 180 degreess from each other. you may have installed the t-stat backwards.

Posted on Jun 20, 2010

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Replaced thermostat water pump overheating seems to have no backflow thru top radaitor hose


The engine gets cool water from the lower hose. And dumps hot water back in the radiator thru the top hose.

The water won't come your the engine until the thermostat reaches the appropriate temp.

After the thermostat opens and the water level drops in the radiator you can fill the radiator.

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Have a 2004 KIA sedona blows warm air but not hot squeese the lower raidator hose and heat gets better for short time then goes back to just warm air what could problem be


As you have tried topping up, I would suggest WHEN the engine is cold you open the water cap that is on the engine block near the back left hand side, DO NOT OPEN WHEN HOT (it probably says that on the cap) try filling the system here, because this is a place where the system can airlock which could be your problem, it might take a bit to fill it because it will go down if your pipes are empty, (you cant circulate air with a water pump) squeeze the pipes at the same time, this needs to be full to the top, while you have this open you can start the engine and watch to see if there is any circulation, top up again if needed, watch your header bottle level. if the water is circulating then it should heat up ok. When full put the cap back on quickly and make sure you have water in your header bottle. if it doesn't heat up after this, then it is quite possibly your water pump, although if the engine is not overheating then I doubt that it is this. Other than that I would be checking for blocked heater pipes or radiator. You haven't said if you are losing water or not, but if you are then I would be checking the pipework that runs from the bulkhead all the way to the rear heater as they rot. I hope I have helped you a little.

Feb 11, 2015 | 2004 Kia Sedona

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Upper hose hot lower hose cold has good heat in car not overheating runs fine just lower hose not hot even after tstat opens


The lower hose shouldn't be as hot as the top. If your not having overheat problems I wouldn't worry about it. If the radiator was clogged, it would overheat.

Feb 07, 2015 | Cars & Trucks

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Mitsubishi shogun 1998 model 2.8 over heating no leeks water is blowing back into the overflow bottle when hot


How are you sure it is overheating? Temp gauge? Most likely are stuck thermostat, bad fan thermostat switch, bad fan. bad head gasket. Coolant going into overflow when hot is how that system is suppose to work. As it cools, fluid is drawn back into radiator. It it is not really overheating, bad radiator cap can allow coolant into reservoir more than normal.

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My 2005 Dodge Durango is overheating


if lower hose is cold and upper is hot there is no circulation several things bad water pump or slipping belt, plugged radiator. air flow going around radiator make sure the side air dam deflectors are there

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1996 nissan altima no cabin heat, new radiator, flushed and filled, top hose hot, lower hose cold, newer thermostat checked good


HI Anon.
Remove your radiator cap (WHEN ENGINE IS COLD), run the motor and let it warm up a minute or two, have someone rev the engine a little while looking into the radiator. If the water goes down and/or you see the water moving, your water pump is good. If not this means that your water pump is bad and is not moving enough water through the system. Try Removing your thermostat and run the engine without it. Keep checking the radiator hoses to see if they are the same temperature. If they are not the same temperature the water pump is bad. If they are the same temperature your thermostat is more than likely the culprit. Hope this helps.

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Engine overheating i have replaced the radiator has plenty of water


replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and water.to bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater hose.open bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

Aug 18, 2012 | 1998 Oldsmobile Intrigue

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I keep overheating changed out thermostat and fan and still overheating I fill the hose with coolant and it all goes into the overfill tank and gets hot and boils out


A clogged radiator could be your problem. Flushing won't necessarily clean out a clogged radiator.
When it's idling and getting hot, the clutch fan should be running full on, actually "roaring" as some say, and the electric auxiliary fan or fans should be on if you have them. Also test your radiator cap, replace if needed. Hope this helps.

Jul 03, 2011 | 2003 Dodge Durango

1 Answer

I have a 98' ford contour that keeps overheating i have replaced the water pump and thermostat and belched the coolant system but it still overheats. when i turn on the a/c the radiator fans work, and it...


Check the radiator itself by feeling the radiator while hot, being careful not to burn yourself feel from the top to the bottom while going side to side, it should be hot at the top and generally cooler as you go down with out any cold spots, if you have a cold spot the radiator is plugged and will need to be cleaned or replaced, also make sure that the radiator fan runs with engine temperature, not just when you turn on the a/c. If this all checks well, look at the exhaust pipe, if you have antifreeze in the radiator see if there is white smoke coming out the tailpipe when engine is hot, if so the cylinder head gasket may be blown out. Hope this helps, let me know.

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1995 Ford Probe, won't turn off...keeps overheating, even after thermostat replacement.


OK how hot does it get Boiling and loosing all coolant in header tank and radiator/at what milage from filling to stopping because of overheating??????????????????????
Problems could be blockage in water system (radiator /thermostat in the correct way around/bugs and dust in radiator inner and outer core/water pump faulty (will cause hot top hose and cold bottom of radiator ) or even bottom hot /top cold ..and if all the above is good then your problem is that you have a BLOWN HEAD GASKET and the compression is being forced into the coolant system as the compression is above 110 PSI and can be forced into the coolant area and hot gases cause overheating.....
Let me know how you get on A.S.A.P Ron

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