The Chevrolet Cavalier uses a thermostat to regulate the coolant system. The engine temperature in the Cavalier will rise during operation of the engine. The thermostat opens to release coolant into the engine to lower its temperature.

Once the temperature is lowered, the thermostat closes until the next time the engine gets hot. A faulty thermostat will stick and not release coolant into the engine properly.

If this happens, the car can overheat, damaging the engine. Access the engine compartment by opening the hood. Follow the upper radiator hose to the thermostat housing. Unscrew the two 8 mm bolts on the housing.

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This will separate the housing, revealing the thermostat. Clean the two surfaces with a razor scraper. Ensure all the gasket material is cleaned off. Replace the old thermostat with the new one. Ensure the new thermostat is inserted the same way as the old one. Place the gasket around the surface of the bottom half of the housing. Ensure the bolt holes match up to the holes on the gasket.

Bolt the thermostat housing together with the socket wrench. Ensure the bolts are tight to prevent leakage in the future. Twist the radiator cap to access the coolant level in the radiator. Fill with coolant until the radiator is full. Start the car and allow it to idle until it warms up. The coolant level in the radiator will drop once the thermostat opens.

Continue filling the radiator with coolant. Once the radiator is full, twist the cap on the radiator closed. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.I have a Chevrolet Cavalier. When I first got it their was no heat and it was running towards the end of the heating line.

We flushed the radiator and filled it with coolant. It has an electric fan, the fan is indeed working. Today the car started to go past the white line and towards the red so I pulled it over. My heater is working good now, so we dont believe it is the heater core, but are wondering if anyone has any suggestions of what could be going on with it. We didnt see any leaks at the water pump or pulley, but heard that its possible that the bearings could have just worn out and need replacing. My father has been saying that the hoses felt soft and as if no water had been flowing thru.

So you saying it is getting HOT and the radiator is still cold. Who put in the thermostat? You know there is a certain direction to install the thermostat. It is actually stamped right on the thermostat itself telling which side should be facing the radiator.

It seems like no coolant is circulating to the radiator now. Also you do not have to worry about the car heating up, but only need to worry if it gets into the red. You pu in a new thermostat so it will run hotter than before because the old one was junk.

So if it is just running warmer that is ok, but if it overheats RED you have a problem. I used to have a 98 Cavalier Z24 and I had an over heating problem while it was idling.

The cooling system is air bound, you need to open the bleeders and let the air out and refill the coolant. Answer Save. Guy I. Good luck. Still have questions?I've got a 94 chevy cavalier 2. I fill the radiator and then start the car and coolant pours out onto exhaust causing car to fill with steam.

I've replaced the thermostat so far but I'm thinking it's either the heater core or water pump. I do have pictures of where its pouring out but not really sure what I'm looking at since I'm no mechanic.

Ed answered 6 months ago. I'd suspect the water pump. Heater core would be leaking inside the car. As you admit that you don't know anything about car repair, why don't you just have a professional diagnose this and fix it. It doesn't sound too expensive. I've replaced the I have a chevy cavalier 2. I have a 99 Chevy cavalier that keeps over heating there is no coolant in the oil and I already replaced the valve cover gasket, radiation,thermostats,water pump, also the coolant tank idk what els I've got a chevy cavalier that over heats I've got a new thermostat fan motor coolant reservoir temp sensor and the fan will still not kick on to cool it down at the right temp which is about I have a cavalier that is trying to overheat on me.

I have put a new t-stat in it, new water pump and radiator. I tested the t-stat before installing in hot water to watch it open up and it did.

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Your Answer:. Upload Photo Photo optional. Related Questions. Start a new Chevrolet Cavalier question. Search Chevrolet Cavalier Questions. Chevrolet Cavalier Experts. Find great deals from top-rated dealers Search. Related Models For Sale.I had a leak in my water pump so we had it replaced and a new thermostat.

Now it is overheating in just about 2 minutes and my heater is now not working. I was told that it is most likely an air pocket in the coolant.

1998 Chevy Cavalier Overheating

I have let the car heat up, not to the point of hot but over half way and shut it off, taken the cap of let it sit for a while and then trying it again. No luck so far. Is there another way to get it out of there? It is the plastic kind. I am at the end of my rope here. Probably air in the system. Raise the car on a floor jack or park on an uphill slope so the rad cap is the highest point. Remove the cap with the engine cold and let it idle. Turn the heat on full hot. Let the engine warm up.

The thermostat should open so the top hose gets hot. I assume the cap is on the top of the radiator. You should see an increase in water flowing by when the thermostat opens; and hopefully air bubbles burping out. You can test it by putting it in a pot of water and heating it on a stove.

98 cavalier overheating?

I always replace the radiator cap when I change the thermostat. Return it to the shop that did the work. It must have an air pocket or the mechanic installed the thermostat in backwards.

They should stand by their work and straighten this out at no charge. Why should you do any work. It should have been returned to you working properly.

Chain shops, weather they are oil change places, tune-up shops, brake shops, or transmission shops are all the same. They are in the business of making as much money as they can out of each car that comes in the door.

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They have their service items that they specialize in and that is all. Your car comes in for an oil change and they will do their best to up-sell, and convince you that you need other critical work that they can schedule you in for.

98 Cavalier Overheating

Of course all the work they find are items on their list. I had someone tell me that they tried to sell her new brakes even though she just had them done two months earlier.

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Your power steering pump could be squealing like a banshee, but if it is not on their list of fixes that they do, they will not even mention it and suggest that you have this looked at.

They may not have even noticed the noise, or thought that it was normal. You could pull into a Iffy lube for your oil change, with another serious problem that would be immediately noticed by a professional elsewhere, and none of the 6 workers at Iffy lube would even give it a thought.

Most of these young people are paid just above what a hamburger flipper would make and get a few perks of being able to change their own oil after their shift is over. Rarely will you find one that is truly a trained mechanic that has more that a years experience.

Just peek in the door and see that none of them have much for a tool box, so that means less tools to do any specialty work.My girlfriends cavalier is overheating. So i yesterday i changed the oil which hasn't been changed in about months and there was a small amount of antifreeze or water in the oil. You may have a very unique position in the failed head gasket. Stop driving the car if this is the case. The ticking noise is likely once the coolant mixing with the oil at temperature you're getting a lack of lubrication in the drivetain you'll get a tapping noise from valves, lifters, etc especially if it's going to be a sound that is rotational with RPM.

It is possible for head gaskets to fail in such a way that they can be affected at certain temps, and under certain conditions.

A car won't necessarily immediately overheat if the head gasket is failing. The best way i can describe it is when you first start the car your cooling system will have a lack of pressure. As the temperature goes up, as the water pump continues to do it's job, your system starts to heat, there is a build up of pressure in your cooling system, in most cars it's between 10psi and 15psi. Once it gets up to pressure it is likely starting to seep through the head gasket where it has failed and then mixes with the oil.

Once this happens you'll lose pressure in your cooling system, the boiling point lowers, you lose coolant, it burns, and you start to overheat.

Drain the oil and coolant, replace the head gasket and make sure there is no oil in the coolant, and that all the coolant is out of the oil, etc. Make sure to properly bleed the system once you are done and you should be good to go.

98 cavalier overheating

Remember that head gasket repair is not necessarily going to fix stuff. If your head gasket is beginning to fail, the best thing to do is replace the head gasket. That stuff can sometimes be about as good as radiator stop leak, which usually can be translated to radiator "stop-working". I hope this clarifies about your head gasket issue. Again, head gaskets can fail in strange ways on rare occasion. I do have to agree with Martin as well, the car does heat up more once it is at temperature and under load once you're on the highway.

But your description about hanging out at the half mark and then eventually overheating sounds like it has failed in an odd fashion. When you be driving on the road you were stressing the engine causing it to expand even more. Just think about is not the same as walking as running, you will stress more running. Do the repairs to the head before you ruin the car. Make sure you install new water pump too and have radiator clean at a radiator shop.Also the heat switches back and forth from hot to cold.

Any suggestions??

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John answered 7 years ago. If you replaced the hose, did you check the fluid after a few drives? Also make sure the radiator cap is working and it is secured on tight. Just a quick check that may not cost much. If all is well, then look for signs of leaks. Is your motor oil normal color?

If it is milky in color you may have a head gasket problem. This my friend if fixed properly will be a bit of change out of the pocket book.

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If you have a garage you really trust, have them check the system out. And yes you really do need a thermostat. I may clear up a lot of issues. DawnC went on vacation and abandoned us, probably got a BMW series and is vacationing on the peninsula near miami. Greg answered 6 years ago. John answered 6 years ago. We rely on past issues we have encountered and fixed. Yes there is always a possibility there may be an air pocket, and the bleeder valve is just the reason GM put it in the cars.

Sometimes the bubble will go away on its own, but leave the fluid low.

98 cavalier overheating

Reading the question, the hose to the heater connection to the firewall was replaced, yet we were not informed why. At times not enough information makes it very hard to be right on in our diagnostic responses, and most of the time there is no feed back from the people seeking help on what the final fix was. That my friend helps us all.

Overheating cavalier

I've had GM cars since through now 3 nowand trust me, I've experienced my share of "hell" finding the problems also, as has a lot of us. Either ease off on your writing style, or take a chill pill my friend. And I have removed my thermostat as a last ditch effort and at times I can literally drive for 3 hours and the temperature stays beautiful and then I can get in it and overheat to the point of stalling within 15 min. The only option left is that I have air in my system which sometimes doesn't let the fluid circulate.

But my min fact that's what it is. I am sorry for my response earlier just the way my hair out with his car that I love so much and I can't take it anymore have you ever heard of a problem like this. The old 40s to early 60s motors would overheat when the main bearings were seizing up and they needed to be replaced during a major overhaul.

This is not the issue. Have someone with a heat gun search the engine and see where the hot spots are. I even may be the water pump not working, but it does not sound like it.

If you replaced the head gaskets, you should of made sure all the water holes in the gasket lined up. Some companies make generic gasket sets and not all the gaskets have holes for the water jackets.

There was a lad here a few years ago that had an issue like yours after changing out the gaskets. He tore down the engine and found several water jackets plugged by the new gasket.Also the heat switches back and forth from hot to cold. Any suggestions?? John answered 7 years ago. If you replaced the hose, did you check the fluid after a few drives?

Also make sure the radiator cap is working and it is secured on tight. Just a quick check that may not cost much. If all is well, then look for signs of leaks. Is your motor oil normal color?

98 cavalier overheating

If it is milky in color you may have a head gasket problem. This my friend if fixed properly will be a bit of change out of the pocket book. If you have a garage you really trust, have them check the system out. And yes you really do need a thermostat. I may clear up a lot of issues.

DawnC went on vacation and abandoned us, probably got a BMW series and is vacationing on the peninsula near miami. Greg answered 6 years ago. John answered 6 years ago. We rely on past issues we have encountered and fixed. Yes there is always a possibility there may be an air pocket, and the bleeder valve is just the reason GM put it in the cars. Sometimes the bubble will go away on its own, but leave the fluid low.

Reading the question, the hose to the heater connection to the firewall was replaced, yet we were not informed why. At times not enough information makes it very hard to be right on in our diagnostic responses, and most of the time there is no feed back from the people seeking help on what the final fix was. That my friend helps us all. I've had GM cars since through now 3 nowand trust me, I've experienced my share of "hell" finding the problems also, as has a lot of us.

Either ease off on your writing style, or take a chill pill my friend. And I have removed my thermostat as a last ditch effort and at times I can literally drive for 3 hours and the temperature stays beautiful and then I can get in it and overheat to the point of stalling within 15 min.

The only option left is that I have air in my system which sometimes doesn't let the fluid circulate. But my min fact that's what it is. I am sorry for my response earlier just the way my hair out with his car that I love so much and I can't take it anymore have you ever heard of a problem like this. The old 40s to early 60s motors would overheat when the main bearings were seizing up and they needed to be replaced during a major overhaul.

This is not the issue. Have someone with a heat gun search the engine and see where the hot spots are. I even may be the water pump not working, but it does not sound like it. If you replaced the head gaskets, you should of made sure all the water holes in the gasket lined up.

Some companies make generic gasket sets and not all the gaskets have holes for the water jackets.


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