Question about Metra 997418 Nissan Altima 2002-2004 Install Kit

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2002 nissan altima new thermostat but heats only while on the freeway

The car is loosing water also but has never overheated, it does not leak as far as I can tell

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Have radiator checked for leak,run with antifreeze use color coolant reccomended for nissan/have ur electric fans checked as well might not be turning on when car gets hot/also check oil to see that there is no water in oil/thats from leaking head caskets

Posted on Jun 19, 2014

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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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Dec 29, 2015 | Nissan Cars & Trucks

1 Answer

Heater only works while on the freeway


Sounds like either low coolant or air in the cooling system. Either you need to bleed air out of cooling system or repair possible leak in system. When there is air in cooling system and it goes into your heater core, heat is not transferred to the air blowing out of your vents.

Mar 22, 2014 | 2002 Nissan Altima

2 Answers

My 2005 nissan altima has no heat


If before you change the thermostat,if the car has always had that thermostat in it,and the heater heated before and the engine is not overheating,the thermostat is most likely fine.But that is the cheapest way to start,Lissa is on the right track there.The heating element may need replaced..

Nov 29, 2012 | 2005 Nissan Altima

1 Answer

Overheating in a 97 nissan altima


First the obvious, make sure you don't have any coolant leaks. If your resevoir is low (empty) you probably have a leak somewhere. Make sure cooling fans work. They should come on when you turn on the A/C. If they work make sure your thermostat is not stuck closed. Thermostat is cheap so worth replacing. If car has overheated you'll need one anyway. That should take care of the problem unless there are other symptoms you're not telling us.

Sep 23, 2011 | 1997 Nissan.5 Altima

2 Answers

My 2002 Altima is overheating. The radiator hose is hot. I am losing antifreeze from the overflow resorvoir. Do I need to replace the thermostat?


Start with the Thermostat and if that doesn't correct the problem replace the water pump. An Easy test since it is getting into mid spring is to just remove the thermostat and see if that corrects the problem. If it does, get a new one and put it in and your done, if it doesn't get a water pump and put that in and put the thermostat back.

Apr 12, 2011 | 2002 Nissan Altima

1 Answer

The heater will not heat i think it the thermostat how do i put it in can you show mw a diagrham this is a 2002 nissian altima


Which engine ? Put a drain pan under top radiator hose. There should be a cast part attached. Remove, you will see thermostat, pull install new, clean old gasket off, install new gasket with ORANGE HIGH TEMP PERMATEX SILICONE, re-assemble

Feb 02, 2010 | 2002 Nissan Altima

1 Answer

No heat ..help installed new heater switch, replaced water pump..replaced coolants, and thermostat......................what else could it be? Nissan 2003 GXE Sentra 1.8 L Engine/...


you could have an air pocket in the cooling system that has to be burped. With a cold engine, park uphill and leave the radiator cap loose. Fill radiator and coolant reservoir. Start engine with cap loose and run at 1500 rpm until temp gauge reads normal. Feel if top radiator return hose from engine to radiator is hot. If yes, coolant is flowing and thermostat is open. If cold, thermostat is not staying closed until engine is hot.

report results.

Oct 29, 2009 | 2002 Nissan Altima

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

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