Question about 2005 Nissan Sentra

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I have a 2005 nissan sentra with a 1.8 engine. my engine seems to over heat ONLY when driving. It stays perfectly cool when idle. I flushed out fuel injectors and replaced thermostat. Still having a problem! Please HELP!!!

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  • Anonymous May 20, 2009

    no, the fans are working!


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  • 135 Answers

Check cooling fan sensor and cooling fan motor

Posted on May 14, 2009

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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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Dec 29, 2015 | Nissan Cars & Trucks

1 Answer

Own a 2001 nissan sentra check egine light is on, car will start but runs very rough and smell of fuel. It will idle roughly in park, but once in gear no power


sounds like engine rebuild time and you need to have the transmition rebuilt too. i hope this helps. if you want to try flush the engine and fuel lines with ethenol. but if you flush the engine you will need to empty the fuel tank first. after you flush the engine full with fuel and run at idol for a couple of minutes. treat the fuel. this should help the engine to run properly whilst you wait to rebuild it. give it a service too. when you flush the engine too white smoke should be emitted from the exhaust or if you have a catilitic converter the white smoke should be reduced. hope this helps.

Nov 24, 2009 | 2001 Nissan Sentra

2 Answers

2005 Nissan Sentra takes a long time to start after running AC


I would recommend a thorough throttle body and injector cleaning. If you have 70K plus miles on the vehicle, combustion deposits build up on the back side of the throttle body and plate as well as the ends of the fuel injectors. When the build up is sufficient enough it will block the area of the throttle body blade that allows air into the engine for starting.
The deposits also build up on the injector tips and distort the fuel spray pattern that will cause a delayed starting problem.
Have them both cleaned along with a fuel filter change and your car will be back to normal.
Good luck.

Nov 15, 2009 | 2005 Nissan Sentra

2 Answers

No heat


My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!

Oct 10, 2009 | 2005 Nissan Sentra

2 Answers

Have 1987 nissan sentra wagon 1.6 carb.engine the problem is an idle problem when I start in the morning or when its had time to cool down I depress the accelorator pedel to set the choke and high idle cam...


Check your Ignition timing before anything
check your plugs see what color they are
red or orange means carb is to lean , black
or oil means to rich then you can go from there
and set mixture screws on carb , let me no how you make out .

Mar 09, 2009 | 1987 Nissan Sentra Wagon

4 Answers

Heater blowing cold air


My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!

Dec 22, 2008 | 2002 Nissan Sentra

2 Answers

Heater blowing cold air


My 05 sentra with 79k miles heat will warm up and then get cold after a mile of driving, we have tried to get the air pocket out, the mechanic stated he thought it could be a blown head gasket, another mechanic said it was a bad heater core. Any advice would be appreciated.

Nov 24, 2008 | 2005 Nissan Sentra

4 Answers

No heat when engine is at low rpm or idle.


if engine temp. is good. i would rec. good flush of the heater core disconnect both heater hoses and flush core in both directions. (pressure washer works good)

Nov 21, 2008 | 2005 Nissan Altima

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