Question about 1990 Chevrolet Lumina

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1990 chevy cavalier wagon 4cylinder over heats new flush new thermostat new cap water pump is circulating water has pressure no leaks and still over heats when thermo opens cools down to 180 then wont open agian the fans are wired to a switch in the car so the temp sensor has been removed

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  • cy schousboe May 11, 2010

    Have you tried running the car with the rad cap loosened ? Turn the heater and fan on when you do to make sure the water circulates through the whole system. Let it run for a while after it gets up to temperature. Also is there any chance the thermostat got put in upside down? Coiled part to the engine. Hope this helps.

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Check all hose and radiator for leaks

Posted on Jul 29, 2009

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Chevy lumina overheat


engines overheat with no thermostats. Very simply put the water circulation is too fast for the heat to transfer to the air. Water pumps fail from bad bearings and pump seal but for no other reason. So back to basics Refit with a new thermostat put in properly. Have a flow test done on the radiator for blocked cores. have a coolant system pressure test done for leaks and cap failure.. have a compression test done to check for head gasket or cracks.. Check for correct ignition timing and air/ fuel ratio mixture. Run fault codes . when refilling with coolant ensure that all air locks are removed

Dec 29, 2013 | Cars & Trucks

1 Answer

93 chevy cavalier 3.1 over heating and heater blows cold, new water pump, thermostat, rad. cap, flushed the radiator, drilled a small hole in the edge of the thermostat, no water in oil and it doesnt...


had a similar problem myself. wound up being the radiator having a restricted flow in spite of being flushed and cleaned. also have you checked to make sure that your cooling fan is functioning properly? also your cooling system could possibly be airlocked, but i doubt it. i would be willing to bet that it is either your radiator not flowing properly. hope this helps out.

Oct 20, 2012 | 1993 Chevrolet Cavalier

1 Answer

Have a 2000 chevy cavalier. new water pump, new t-stat, new head gasket , new coolant, still running hot


Two ideas.

1. Try a new radiator reservoir cap (trust me, it is very important in holding pressure which keeps the coolant from boiling out).

2. This one you will need an entire weekend to spend on this. You need to remove the thermostat and replace the thermostat housing. pull one of the radiator hoses and attach a garden hose with good pressure. It needs to flush for at least 20 minutes. Then switch directions and flush water where was coming out. Then put it back together and drive until it gets hot. Allow it to cool for 45mins (to prevent engine from cracking due to rapid cooling) and repeat until no crud comes out when flushing.

May 30, 2011 | 2000 Chevrolet Cavalier

1 Answer

I replaced the water pump and a new serpentine belt and its still leaking and over heating


I would pressure test it using a snap on pressure tester or equivalent. I would locate the leak in this manner.

Then, I would flush the system out to see if any sediment can be removed that may be causing a lack of circulation.

I would , also, check if the fan goes on when at normal operating temperature.

Also, if the interior gets hot and the temperature of the engine goes up high, then a thermostat change may be in order, because it may be stuck closed.

Good luck on diagnosing and repairing your overheating problem.

Feb 12, 2011 | 1999 Chevrolet Cavalier

1 Answer

1999 chevy cavalier. wasn,t getting heat to inside. put in new thermostat. heated up fine for a couple of miles, then cool air. shut off when got back home. anitfreeze was bubbling back out of reservoir....


make sure you get ALL the air out run it without cap until you see water circulate turn heater to hot NO FAN ABOUT 5 MIN close cap ,see if that works

Nov 29, 2010 | 1999 Chevrolet Cavalier

1 Answer

Over heating.Replaced thermostat using a 192,replaced water pump,too.The temp gauge on dash, cools down in idle speed, accelerates while in D...no evident leaks yet loses coolant. NO BLOW BY, WHITE EXHAUST...


Have you pressure tested your rad cap? It may not be holding the proper pressure. Also, is the rad in good shape? Are the rad fins in good shape & is the coolant in the system circulating properly. It is possible the new water pump impellor is slipping. When engine is cool, take rad cap off & start the engine. Check for coolant circulation in the rad when thermostat opens. Is it flowing freely without restriction? Top off the coolant again , you may have a vapor lock. Hope this helps. Good luck!

Oct 05, 2010 | 2001 Chevrolet Cavalier

1 Answer

1999 chevy cavalier overheats


When the engine has cooled down check the coolant level and make sure it is full. If the coolant is in the operating range, I would suspect one of two problems, water pump or thermostat. With the engine on check to make sure the serpentine belt (should be only one belt for your engine) is turning the pulley for your water pump is rotating without restriction.
The thermostat will allow coolant flow when it reaches operating temperate. You may be able to squeeze the hose and feel the pressure of the water flow when the engine is heating up. Be careful of loose fitting clothes and your body stays away from moving parts of the engine. If you have no flow check the thermostat first and if the flow of coolant is not circulating when the engine warms up you will have to drain the coolant to remove the pump to check the operation and replace if necessary.
The thermostat is inexpensive but you may have to drain and refill the radiator. If the water will not flow though the radiator it will not cool the engine. Follow the large radiator hose to the engine block. The hose connects to a cast iron elbow with two bolts holding it to the block. Drain the radiator fluid, unbolt the two bolts and you should see the thermostat. Clean off the old gasket off the block and elbow then bolt the elbow and new thermostat with gasket to the block to the manufactures torque specs. I would buy some radiator flush if it has not been flushes for several years. Fill the radiator with the correct ratio of coolant and water replace the cap then run the engine for 15 minutes and look for leaks or listen for hissing from the leaks.

Jul 20, 2010 | 2001 Chevrolet Cavalier

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