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20 Reasons Why Your Engine May Run Hot
1. A lean air/fuel ratio (also check fuel pump and filter)
2. Too much timing/retarded timing/advance curve malfunction
3. Clogged radiator/collapsed radiator hose (restricted water flow)
4. Clogged engine (restricted water flow)
5. Stuck thermostat/incorrect thermostat
6. Bad water pump
7. Incorrect water pump speed (too slow, too fast)
8. Radiator too thick
9. Wrong-pressure radiator cap
10. No shroud around fan/improper fan position within shroud
11. Bad fan design
12. High-volume or high-pressure oil pump
13. Electric fan (puller or pusher) blocking air flow
14. Too much antifreeze
15. Wrong type antifreeze
16. Wrong spark plugs (i.e., wrong heat range)
17. Wrong gasoline type (try 89 or 92 octane)
18. Clogged catalytic converter
19. Clogged injector system
20. Exhaust getting into the water due to a cracked head or blown head gasket. Have your local radiator shop test your system for carbon dioxide.
It is also recommended conducting a flow test to locate a cooling system problem. Begin with a cool engine. Remove the radiator cap. Start the engine. Bring the engine up to operating temperature so that the thermostat opens. Increase engine speed to 2000 rpm. If water gushes out of the radiator, there is a flow restriction in the system. This must be corrected for proper cooling.
All those are great general universal problems, however on the 99 cavalier there is an air bleeder valve on the right hand side of the motor, there is a little steel tube coming out of a rubber hose and the valve sticks up on the steel tube. Open that bleeder valve up and a little air should come out. What happens is an air pocket blocks flow of coolant as silly as it sounds.
If that's not the problem check to make sure your fan is working. If it doesnt turn on when the car is hot, there is an ($11.00) relay that controls the fan, on the right side under that black box next to the battery. This also goes bad on the cavaliers too. Hope this helps, repost if this doesnt workout. I have a cavalier too so I can give you specific advice :)
What else can I help you with?
Engine is running hot in my 1998 Chevy cavalier?
Did u check your enigine cooling fan?
Your 2004 Chevy Cavalier temperature gauge is not giving correct reading and The pin is buried all the way around but the engine is not running hot Whats happening?
If you are sure the engine is not running hot then it could be a bad coolant temp sender.
Chevy Cavalier have an afterun fan?
because its still hot and needs to cool down
2003 Chevy cavalier engine shuts off when slowing down?
Chevy Cavalier is a shity car. Ditch and buy something of value. Then sell your Mama on e-bay. I hear she is hot.
How do you check the transmission fluid on a 1995 standard Chevy cavalier?
Locate dipstick at rear of engine between motor and firewall, usually has a red handle. With motor running and hot read the marks on the dipstick.
Where do you put freone for air condition in a 1989 Chevy Cavalier?
I have a 1989 Chevy Cavalier, and I need to know how to put freon in to use the air conditioner in my Cavalier. Right now it is blowing hot air, would like cold air. Please help me.
Why is my 2002 Chevy Trailblazer running hot?
Your Trailblazer may be running hot because your fan is no longer working. It may also be running hot because your don't have coolant in your car.
Have a 1998 Chevy Cavalier coolant leaks from somewhere near the front of the engine when cold but not when running or hot?
You may have a bad head gasket and it may be leaking from that. Why when cold i dont know, but if you are losing coolant it may be the head gasket.
How do you keep your Chevy cavalier from running hot without the water pump?
You probably don't. The water pump is what circulates coolant through the engine block and the cooling system. The engine will soon overheat if the pump is not functioning. This is a bad thing ~
Cooling system diagram for 1992 Chevy lumina with a 3.1 motor?
system running hot fans not running
98 Chevy cavalier runs hot in traffic or on interstate fine around town replaced radioator last year did not cure it?
When it's running hot you should hear the cooling fan running, if not that is your problem. If the cooling fan does not operate check the fuses, cooling fan relay, cooling fan switch and cooling fan motor. One of them is at fault.
Why is your 02 cavalier running hot and only blowing out cold air?
either low on collant or a failing water pump
