2000 Altima Cooling System Problem - Nissan Forums : Nissan Forum
 
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#1 Old 06-18-2008, 10:54 PM
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2000 Altima Cooling System Problem

I have a 2000 Nissan Altima. I replaced my water pump and belts and flushed the cooling system. When I put it all back together and started it back up the engine got really hot. Everything was working before the water pump went out.

Im assuming there is air trapped somewhere in the cooling system. However, I can't seem to find where it's trapped. I'm hoping the description below might at least help someone point me to where the blockage is, or possibly point to something else that's causing the problem.

Symptoms:
-Car starts out at a good temperature when starting cold, but after a few minutes it overheats
-Air blows out when I turn on the heater but no hot air
-Car runs fine when I turn it on. No rough running or extra exhaust so I would tend to rule out any head gasket problems.
-I can hear the heater core motor running.
-Just before it's about to overheat, the radiator jerks around a bit like it's super hot. The upper radiator hose is boiling hot. The other hose going to the thermostat is cold (which I suspect is normal since the radiator would cool the water on its way down?)
-Both heater hoses are warm, but definitely not hot like the upper radiator hose is. The heater hoses don't feel like they have much coolant running through them.
-Occasionally while the car is idling the RPM gauge jumps up and down from 1000 to 2000. This does not occur when I have the flush n fill cap removed.

-If I take the cap off the flush n fill kit in the heater inlet house I see no coolant. If I run the car for a few minutes and it reaches operating
temperature, some fluid sprays out periodically, but the interesting thing is is the temperature remains down. If I just keep adding fluid to the overflow tank, and let it shoot out the heater hose, the temperature stays down. If I cap off the heater hose again, after about a minute the car starts to overheat. Is this because the hot coolant can't get pass the heater core? This makes me think that the heater core may be plugged.

Actions take so far (all with heater turned on to max and blower on max):
-Replaced the water pump, pulley and belts
-Bled the cooling system 3 separate times following shop manual instructions (finally found the bleeder bolt and made sure it was open while bleeding).

-Took the water pump back off to inspect. Water pump looks fine and spins freely. Looked for any blockage in cooling hoses near water pump and found nothing blocking
-Changed the thermostat, making sure to install it in the correct direction.
-Replaced radiator cap
-Tried cracking open the flush n fill cap just a little but that still causes it to overheat.
-Flushed cooling system with thermostat removed and using one of those flush kits that attaches to the heater hose.
-Tried temporarily removing thermostat, no change
-Turned on A/C and the two radiator fans kicked in. When I run the heater on hot the two radiator fans only turn on if I've opened the flush n fill cap and let a lot of hot coolant escape for several minutes.

Questions:
-Could it be a clogged or bad radiator or heater core?

-What would you recommend I try next? I thought about disconnecting both heater hoses from the engine side and running the garden hose through one to see if it comes out the other end (should tell me if heater core is plugged?). Would attaching the garden hose also potentially clear the blockage?
-If this sounds like it could be a radiator problem, anything I could check on the radiator?
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#2 Old 06-18-2008, 11:52 PM
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Have you tried opening the air bleed on the side of the motor under the dist.???(read you have)

Is the thermostat good , old , is there one?( I see you did check it out)

I would think you have air in the system that turing into steam, steam evaporates, I would fill it up, top it off put the cap on, crack the steam vent and let it get hot ,close the vent, see how that works, If this dosen't work , I would say you have blockage in the radiator,

Last edited by steve68; 06-18-2008 at 11:57 PM.
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#3 Old 06-19-2008, 04:31 PM
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Thanks for the help. I tried to crack open the bleeder bolt and no luck. I then tried jacking up the front end so that the radiator would be at the highest point, then opened the radiator cap and tried to bleed it that way. Still no luck.

Is there a good way to find the blockage in the radiator? should I just disconnect all hoses and run the garden hose from the top?

quote=steve68;3528752]Have you tried opening the air bleed on the side of the motor under the dist.???(read you have)

Is the thermostat good , old , is there one?( I see you did check it out)

I would think you have air in the system that turing into steam, steam evaporates, I would fill it up, top it off put the cap on, crack the steam vent and let it get hot ,close the vent, see how that works, If this dosen't work , I would say you have blockage in the radiator,[/quote]
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#4 Old 06-20-2008, 12:35 AM
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i had the same problem with my altima... check this out.. check the belt pattern for starts.. its possible that you might have put the belt over the waterpump the wrong way and its flowing wrong. trust me when i first found out my waterpump was bad when i changed mine i put the belt wrong and after about 5 - 10 mins it overheated.. when driving it and all it overheated. trust me try that before you get more into yourself and end up messing up the head gasket or something. before i figured out my belt pattern was wrong, i changed radiator twice because it blew them, radiator cap, blew a hose, thermostat 3 times and cooling sensor. then i looked closely that my belt pattern was wrong where the water pump is... try it and let me know what happens

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1991 - 240sx KA24DE-T 308whp 296wtq @ 12lbs
2000 - Altima KA24DE-T 372whp 338wtq @ 16lbs on e85
2001 - Altima STOCK Daily
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#5 Old 06-20-2008, 04:02 AM
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Good idea, kinda thought of it but blew it off, again good idea,
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#6 Old 06-20-2008, 04:35 AM
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thanks.. just thought id throw my cooling system mistake in there.. i bet you thats most likely what it is...

KA24DE-T
"The T stands for turbo, which translates to "im boosted bitches"

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#7 Old 06-20-2008, 06:33 PM
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Thanks I'll try that

Quote:
Originally Posted by BiGJoHn619 View Post
i had the same problem with my altima... check this out.. check the belt pattern for starts.. its possible that you might have put the belt over the waterpump the wrong way and its flowing wrong. trust me when i first found out my waterpump was bad when i changed mine i put the belt wrong and after about 5 - 10 mins it overheated.. when driving it and all it overheated. trust me try that before you get more into yourself and end up messing up the head gasket or something. before i figured out my belt pattern was wrong, i changed radiator twice because it blew them, radiator cap, blew a hose, thermostat 3 times and cooling sensor. then i looked closely that my belt pattern was wrong where the water pump is... try it and let me know what happens
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#8 Old 06-23-2008, 06:42 PM
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Thanks to BigJoHn619! I had the belt on the wrong direction. man...all of that time and such a simple mistake. argh! Thanks for everyone's help.
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