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Engine overheating?

Tiny
ASH7861
  • MEMBER
  • 2004 NISSAN ALMERA
Hi
my car started overheating and I took it to a mechanic who took out the thermostat and replaced the radiator cap. A month later it started overheating again and replaced the water pump. After doing that and bleeding the coolant system the car is still over heating. The head is not blown. When I feel the radiator pipes the top pipe is extremely hot and the bottom one leading to where the thermostat was is ice cold and does not get hot. Even my car heater doesnt get hot anymore. They checked the entire system for blockages and they said they no blockage anywhere. Please can you perhaps tell me what the problem could be
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Saturday, April 24th, 2010 AT 8:38 AM

20 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
Hello,

It sounds like the water pump impeller has fallen off the water pump, I would remove it to confirm the failure here are two guides to helps walk you through the repair and diagrams below to show you how the job is done on your car.

https://www.2carpros.com/articles/water-pump-replacement

and

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Wednesday, May 3rd, 2017 AT 11:04 AM
Tiny
SHELLEEHOLT
  • MEMBER
  • 1 POST
Thank you for this post I had this problem and had to replace the head gaskets cost me $1200.00 but at least it fixed.
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Wednesday, January 9th, 2019 AT 12:22 PM
Tiny
MABUSELA
  • MEMBER
  • 1 POST
  • 2004 NISSAN ALMERA
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 110,000 MILES
Hi,
I am driving the car listed above Comfort-line and my car heater gauge goes almost to red mark every time when either I am standing still or driving in a congestion traffic. And before it reaches the red mark the fan will kick start and it will go back to its mark and sometimes when I am on a long distance drive maybe doing 120 km per hour the gauge will do the same buy going up and down. The gauge does not remain on its mark. When checking both water pipes to the radiator both pipes are hot and everything looks normal but I am just worried why the gauge does that.
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Thursday, November 26th, 2020 AT 10:51 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
The fans kicking on is normal because it is trying to cool the coolant and keep it from overheating. The fact that it brings the temp back down, is a good thing. However, the reason it is going up and down is because you more than likely have a leak or just air in the system. Either way, we need to start with pressure testing the system and making sure it will hold pressure.

If it does then we either have a thermostat issue, water pump issue, or a restriction somewhere else in the system.

https://www.2carpros.com/articles/radiator-pressure-test

https://www.2carpros.com/articles/how-an-engine-thermostat-works
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Thursday, November 26th, 2020 AT 10:51 AM (Merged)
Tiny
TOUGHDIVER
  • MECHANIC
  • 224 POSTS
Hi,

It could be a erratic engine temperature thermostat causing the temperature gauge to move excessively. Vehicle may just need the thermostat replaced but I always recommend cooling system service. I'm attaching repair guides below for you to reference. Let us know it this information was helpful or if you need more info.

https://www.2carpros.com/articles/engine-cooling-system

https://www.2carpros.com/articles/how-an-engine-thermostat-works

Thank you
Joe T.
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Thursday, November 26th, 2020 AT 10:51 AM (Merged)
Tiny
FORWARD62
  • MEMBER
  • 1 POST
  • 2002 NISSAN ALMERA
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 215,000 MILES
I removed the radiator, had it cleaned, dealer reported it was blocked. I also replaced the waterpump, removed the thermostat, check if it works properly, no problem. The fan kicks in as heat gauge goes over half mark. What I found was that the top house are hot, the bottom hose warm ( can grip comfortably), and the heater hoses are both cold. The car overheats, water spills out at plastic water bottle when driving for about 25 to 30 km's distance, the top radiator hose very hot and bubbling as water pushes out at plastic bottle overflow. Any ideas what to do? Danny
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have coolant system pressure checked for a head gasket leak
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
MAHLORA2
  • MEMBER
  • 1 POST
  • 2001 NISSAN ALMERA
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 300,000 MILES
Hi
My car is overheating. I changed thermostat, still overheating. I changed the water pump, still overheating. Then, I took out the thermostat, no more overheating. I bought another thermostat from Nissan and fit it in, but still overheating, no difference from the other thermostat. When it overheat, the hosepipe for thermostat is ice cold.
What will be the after effect of not using thermostat?
Can you please help me, What is the problem here?
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
En it gets hot, check radiator with engine off for cold spots it should be same temp all over you can use your hand if fans are disconnected. It also may be a water pump problem. Running without a thermostat will allow engine to not go into closed loop so fuel mileage will be a lot lower.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
SLEUTH
  • MEMBER
  • 1 POST
  • 2001 NISSAN ALMERA
  • 6 CYL
  • FWD
  • MANUAL
  • 220,000 MILES
I have a Nissan Almera 2001 1.6 Lux which is over heating, what can cause this?

Keeping in mind that it's not the thermostat, the radiator cap, or the water pump, as they have all been replaced, and are working.

Also the heater stops working when the car overheats.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the radiator if its clogged-up if not try bleeding the cooling system and see what happens if it continues to overheat have it chemically and pressure tested-
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 2000 NISSAN ALMERA
The car due switch off it's self when the engine is hot so what most have been the problem?
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Are you able to restart?
Does keeping pressure on the throttle keep engine running
What is the idling speed after warming up?
Is the Malfunctioning Indicator Light showing?
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
TOMáš DRUMMING EIBL
  • MEMBER
  • 5 POSTS
  • 1997 NISSAN ALMERA
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 120,000 MILES
Hi,
I just today changed the water temperature sensor on my ga14de engine because I suspected it went dull since it under no circumstances went above the middle on the gauge even after spirited driving. The fans had no problem coming on. And since I changed it for OEM new one the gauge is in the red pretty quick and the fans will not come on.
The car has two temperature sensors and I only changed one. Is it possible that these need to be changed both in order to communicate with each other properly?
I am in dire straits please help.
Thank you.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Sounds like the original sensor was working correctly. If the cooling system is operating as designed you should not see any real increase in the operating temperature of the engine unless there is a large problem. That or there is a wiring fault at the new sensor. Two sensors usually means one goes to the gauge and the other goes to the computer.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
TOMáš DRUMMING EIBL
  • MEMBER
  • 5 POSTS
There is basically nothing that can go wrong. I suspect it might be the wire itself or the plug since the wire looks old and all crusty. I will try replacing the wire and plugs and see if it will solve the problem. I also think it is the wire or plug fault since when I started it up this morning it was quite cold outside and yet the temperature was on the middle in less than a minute.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Old and crusty with corrosion can cause a lot of problems. Let us know what you find.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
TOMáš DRUMMING EIBL
  • MEMBER
  • 5 POSTS
Thanks I will.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
TOMáš DRUMMING EIBL
  • MEMBER
  • 5 POSTS
It turned out that I received a bit different sensor than I ordered. I noticed that when I compared resistances of the old and the new and the new one had significantly lower resistance thus it is more sensitive to temperatures. So I ordered a correct one and will be fitting that as soon as I get it. Thank you for your help.
And have a great day.
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Thursday, November 26th, 2020 AT 10:52 AM (Merged)

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