1994 nissan sentra overheat

Nissan sentra  overheats While Driving

Car Runs Hot

The most common part that fails when car is overheating is Thermostat, some how it get stuck in one position. I you decide to get the part, get it from a Nissan dealer.

The other part I can think of is Coolant Temperature Sensor. Maybe it's not turning on your fans.

Check the engine oil, make sure coolant hasn't gotten in. Could be damage to the engine block if coolant and oil mixes.

Remove thermostat and see how the cooling fan works.

If the thermostat is removed, and if you are sure the fan is operating correctly, there are 4 other things to look at!

1. when you fill the cooling system, be sure to bleed it properly.
Set the blower to "hot" to eliminate air from the heater core as well.
Position the car so that the radiator is at the highest point.

2. Could be a leak in the cooling system.
Get the car up to operating temp. and physically check for leaks.
Or get a pressure check done on the cooling system.

3. Could be a blown head gasket!
Oil and water wont always mix.
There could be a leak between the cylinder and cooling system only.
The surest way the check is to get a chemical leak down test done.
This checks for combustion gasses in the cooling system.

4. If it passes the chemical test, get the radiator stripped and cleaned as it could have a bolckage!
Especially if the car only overheats under heavy loads like constant high speeds or stop start hard acceleration!

Following these step will be sure to locate the fault!


Most likely a restricted radiator or a leaking head gasket. These were the two most prevelant cooing system problems with the Sentras when I had my shop. Flow testing the radiator with a hose won't tell you much unless the radiator is completely clogged. Likewise, a minor head gasket leak will not always produce white smoke; but will cause the engine to overheat. 

Unless you want to spend a lot of time and money with trial and error, take the car to a radiator shop and have them do a diagnostic test.

Sure the thermostat is in the right way? Always worth checking the direction of flow. That would do exactly what you are talking about. 
Air bubble in the system would also do that. 

-------------
1994 Nissan Sentra is overheating. Thermostat and water pump have been replaced, and we bled the system as best we could. A friend is suggesting a radiator flush. Will this fix the problem,

OK, First off, make sure the cooling fans are actually coming on when the car is hot. This can be a big problem.
I do agree that a radiator flush or a radiator may be in order. You have to maybe check the cooling fins on the radiator. They may be full of dirst and not allowing air to fl;ow through.
Lastly, have the system pressure tested. Leave the pressure on it for about an hour, then pull the spark plugs and check for anti freeze in the cylinders. You may have a small head gasket leak that is allowing the hot exhaust into the cooling chamber and causing the car to overheat. Hope this helps! Thanks

-----------------

What would cause a 94 Nissan Sentra to overheat when radiator is cool to the touch? Waterpump, radiator, and thermostat are new. and after shifting into neutral to come to a stop, car shuts off. 

If you leave the coolant fill cap off and let the car idle, do you see a constant flow of air bubbles? Do the cooling fans operate? Were all of the items listed replaced to try to cure this problem?

Both fans are operational. After engine idles for 2-5 minutes with cap off, water bubbles out of radiator opening. Yes, all items were replaced to cure problem.

Ok then is sounds as though the cooling system is doing what is should, but something is stopping the coolant flow. The air bubbles being present would be very much a characteristic of a faulty head gasket, cracked cylinder head, or even possibly a cracked engine block. There is a chemical test that can be done on the cooling system to verify that there is engine compression inside of the cooling system. It may be a good idea to check around at your local repair facilities to see if any of them can do this test for you. 

----------------

If You tried Everything and it still overheats then the problem is related to blown headgasket

To know how to test blown headgasket check the link below:

Comments

Post a Comment

Popular posts from this blog

How To Test for a Blown Head Gasket

Image
Blown Head Gasket Testing Nissan Runs Hot and overheats while driving The average cost for a Head Gasket(s) Replacement is between $1314 and $1679. Labor costs are estimated between $1270 and $1603 while parts are priced between $44 and $76.Get a personalized estimate based on your location and specific car. Estimate does not include taxes and fees. But first test and confirm that headgasket is faulty. If your 1.8L Nissan Sentra has severely overheated and doesn't start or it starts and runs but overheats (and you've already confirmed that the fan, thermostat and water pump work)... there's a good chance you've got a blown head gasket on your hands . There are 4 very simple tests that you can perform on your Nissan Sentra that will let you know if the head gasket has blown. In this tutorial, I'll show you how to perform them in a step-by-step way. To prevent an expensive, recurring problem, the integrity of the entire Nissan cooling system should be inspe...
Read more

How To Replace Electric Door Locks In Car?

Image
Door Lock Replacement The  electric door locks  inside of your car doors consist of a control switch, the locking door latch and/or an electric control solenoid. When the control switch is energized an electrical impulse forces the control solenoid to push or pull the locking mechanism depending on the command selected. (Lock and unlock). Anytime you have problems with an electric door lock check the  fuses  or thermo fuse the powers the system. Step 1 - Identity Door Switches and Controls Door Panel Components The average vehicle door has basic controls for the different functions the door performs. Interior light and safety reflector helps illuminate the interior of the vehicle. When the door is open the light and the reflector alert people from a distance your door is open. The electric window switch controls the electrical power to the window motor. The motor turns a series of gears and/or cables to power the window up and down. The electric door swit...
Read more

New Clutch Slips After Installation

Image
Adjustable Clutch Master Cylinders Clutch Slips If the clutch is cable operated then you might need to slacken the cable. Clutches are the opposite of brakes, as they wear brakes get slacker but clutches tighten up. If there's insufficient slack in the cable then this will prevent the clutch from fully engaging.  If it was slipping because you rode it, the plates would be glazed. Good plates would means that they did the job wrong. A greasy flywheel maybe. The pedal is stiffer because they used stronger springs when they did the job. If it's mechanical linkage, they might have left it too tight. poor job of replacing clutch assembly ,if  only replaced the disc and not resurfaced the flywheel and replace the pressure plate. Once they get glazed form slipping a new disc doesn't help very much. Look at your old receipt for the work, it should list the parts: clutch disc pressure plate pilot bearing throw-out bearing pressure plate job-out...resurface flywheel ...
Read more