Question about 1993 Nissan NX

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My 93'Nissan NX 2 ltr.is running hot it dosnt overheat and the cooling system is great.yet it still the engine is clearly too hot even after running only a few minutes.

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Posted on Dec 25, 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

3 Answers

Why did it overheat on way home from dealer?


I've replaced many of the radiators in these. They clog up on the inside. And if someone use stop leak in it, it only makes it worse. To check, Remove the upper hose from the engine and the lower house from which side is easiest to get to. Put a garden hose in the top one and turn it on, it should run threw the radiator as fast as it goes in. If it wants to come back out the top hose more than the bottom. Replace the radiator. If you just bought this, i would take it back. Most states you have 72 hours to cancel any contract Sale Even as is

Sep 05, 2015 | Jeep Cars & Trucks

2 Answers

Car wont start on hot days!!!


once had the same problem the armature in the starter expands when hot and wont crank cools down and starter works

Jan 09, 2013 | 1990 Nissan Pulsar

1 Answer

My nissan quest first began to run hot only when the air conditioning was on. After a couple of weeks of riding without ac, it began to run hot even with the ac off. We've replaced the water pump and...


have a local mechanic do a pressure test on the cooling system as i think that a vehicle this old could need a new head gasket as they do deteriorate with age especialy on vehicles around the 98 to 2002 era with that funny bonding material that was used

Jul 19, 2011 | 1999 Nissan Quest

2 Answers

I have put new water pump, thermostat,fan,radiator the 1996 nissan sentra still over heats what could it be now


A clogged catalytic converter or a restricted exhaust will cause over heating. Also a cracked head or bad gasket. Also, if your engine timing is very far off it will overheat. Make sure you have all the air out of your cooling system and it is actually running hot, not just your gauge showing it's hot.
I hope this helps.

Jul 02, 2011 | 1996 Nissan Sentra

1 Answer

My neighbor just went to check his oil in his nissan nx 2000 (93). He pulled the dipstick and the housing came out with it. 2 questions- is it possible to access the location the housing fits (we can't...


It's not welded. Most of the time it is just a pressure fit with possibly a bolt and clamp that holds that in place someplace along the tube. Your looking for a 1/2" hole along the side of the block where the oil pan mounts. The hole is on the engine not the oil pan. When you locate it just stick the tubing back in and tap it lightly to seat it. Look for a clamp and bolt to lock it back down or if the tube has a bracket attached to it look for a suitable location to bolt that to the engine block.

Feb 19, 2011 | 1993 Nissan NX

1 Answer

I have a 93 nx 1600 and have to change the cluch cable and not sure where it comes in from the fire wall the old one broke off


chilton and hayes both make a great bible for your car that will help it's sold at chapters

Jan 06, 2010 | 1992 Nissan NX

1 Answer

How many qts or ltr's of coolant does it hold?


look we never look up the capacity because it varies with how much you drain out, here is what u do, fill the radiator as full as u can, also fill the recovery/surge tank to the top, run the engine until it gets hot, don't let it overheat, turn it off and let the system cool down and then top off the radiator and recovery tank, u are done!

Dec 29, 2009 | 1993 Subaru Legacy

1 Answer

93 acura continues to run hot, the bottom hose isnt getting hot. i have changed the thermostat.


this is caused by a leaking cylinder head gasket or air in the sytem, if u did not bleed the cooling system follow this procedure, it is generic for all cars.
The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling systeml , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank

Dec 10, 2009 | 1993 Acura Legend

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