Question about 1996 Nissan Sentra

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Cooling system overheating

Nissan serena 1.6 petrol 16v 1995. new radiator just fitted. every time i fill radiator with water car boils up and over heats have tried it with the thermostat in and out but it still boils up! Is there a special way of filling with water? seems to be a lot of air in the cooling system! being a mid engine car the rad is a long way from the engine, there is a filler cap next to the engine as well as one on top of the rad. Can anyone help with this problem please?

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Hi! Theres a coolant reservoit that connects thru the radiator. The coolant level should not be full, it must be just on the HI / MAX indicator. You fill it too much it will spill and leave you with no coolant to circulate. That may be the cause of overheating. HOpe this helps and have a good one!

Posted on May 03, 2010

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Posted on Jan 02, 2017

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Will an air pocket in the coolant system cause it to overheat or over pressurize on a 2001 Nissan Sentra ?


1. The radiator cap if working correctly it will release pressure in the system provided the cap you have is the correct pressure setting. If you are having a problem with pressure then replace the cap with a new radiator cap with the correct pressure setting. Do not use a cap with a pressure setting other than the original equipment pressure spec. So you do not go to the parts store and buy any radiator cap on the shelf that fits because they come with different pressure ratings and some of these will be totally unsuitable for your car.

2. If the pressure valve is stuck in the "old" cap the pressure release system will not work.

3. Overheating
Air pockets in the cooling system can definitely cause overheating and can retard coolant flow through the system. If you are draining the radiator to replace the coolant or replacing the radiator you need to follow the correct procedures for bleeding air out of the system for that particular engine after coolant refilling. Some engines have bleeder screws on the cooling system to assist in the air bleeding procedure and some don't.

There are various causes for overheating so don't assume it will necessarily be solved by bleeding any remaining air from the cooling system and replacing the radiator cap with one that works.

Other causes can be...........
1. Faulty cooling system thermostat. (Replace the Thermostat)
2. Faulty water pump, especially if the impellers have corroded away or have disintegrated in the case of those design genius water pumps with plastic impellers. (Replace the water pump)

3. Cooling fans not working and if so the cause needs to be tracked. Check that your fans are kicking in. If the engine is overheating the fans should be running because they will switch on when the coolant reaches a specific temp and well before the coolant gets excessively hot.

4. A partial blockage in the coolant passages inside the engine but not in the radiator if you have a new one. If the coolant is not changed at the required intervals(frequently the case with many owners) or is over diluted with water you can get a build up of debris. If products like stop leak have been used in the system this can create similar problems with partial blockages inside the engine coolant passages.

5. A compression leak into the cooling system.
If you have bled air from the system and have continuous air bubbles in the cooling system I would suspect a compression leak. In that event a basic leak down test will show if you have compression gasses leaking into the cooling system and from which cylinder(s). The spark plug is removed and compressed air is forced into the cylinder via the spark plug fitting and air bubbles will show up in the coolant of there is a leak into the cooling system.
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Have the problem with overheating addressed immediately. Running the engine with an overheat condition will cause expensive engine damage many times the cost of fixing the overheating issue.

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SOUND LIKE BAD THERMOSTAT REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP..BUT YOU NEED TO MIX 50/50 MIXTURE OF ANTIFREEZE AND WATER IN THE COOLING SYSTEM TO RAISE BOILING TO KEEP CAR FROM OVERHEATING.

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Nissan serena 1.6 16v 1995 petrol. Just fitted new radiator and when i filled with water it overheats and boils up! is there a special way of doing this because it keeps overheating! seems to be a lot of...


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