Question about 1996 Chevrolet Cavalier

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Changed the thermostat and the alternator but keeps trying to overheat, have to leave fan on high and heat on high and in the defrost and heat for feet setting

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Sounds like a faulty water pump. Check to see if any coolant is leaking from the water pump. If the check engine light is on, take it to an autoparts store and have a scan done to get fault codes. Most parts stores will do the scan for free. If it is something like a coolant temp sensor or anything, the codes should identify the problem. My gut says water pump. Hope this helped and best wishes.

Posted on Jul 29, 2009

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Posted on Jan 02, 2017

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2 Answers

2007 nissan exterra overheats


Hi Kim,

I can feel your frustration. It sounds like you've done all the logical stuff already. The "donut hole" in your process would seem to be not changing the water pump. The water pump as you might imagine, is responsible for circulating (pumping) the relatively cool water in the radiator into the running engine that contains the hot water. Hoses connect the two together. A thermostat is between the radiator and the engine. Once the water in the running engine gets to a certain temperature, the thermostat opens allowing the water pump to send cool water into the engine and hot water out to the radiator to be cooled. The heater core is usually on the passenger side firewall area.

It sounds like the water pump is the only thing left to change - if it isn't working - it can't circulate the water - and will result in overheating. Lastly, a clogged heater core shouldn't cause the engine to overheat - in fact, if the engine begins to overheat, you should turn the heat to HIGH fan and HIGH temperature to help remove some of the heat in the coolant.

Good luck!

Apr 11, 2014 | 2007 Nissan Xterra Off Road

1 Answer

1997 Grand Am overheated. Fan, temperature gauge changed. Head gasket replaced. Car was running fine, couple days later, acted like it wanted to overheat, why does it keep doing this?


I think you need to clean your radiator(open water tank and remove all dirt inside it and inter in water hols and pipe thin stick), change thermostat to lower degree heat, if the problem continue try to remove thermostat.

Mar 20, 2013 | Cars & Trucks

1 Answer

My 2005 nissan xterra heater blows cold at idle, but would get warm to hot when I rev-up or started moving the vehicle. Also, the A/C compressor turns on when I set it on defrost/floor or defrost. I've...


Does your car overheat too?
If so, you could have a faulty thermostat, an air pocket in your cooling system or maybe even a leak somewhere. My truck's heat would only work while I was driving, then stopped working altogether while the engine started to overheat. I changed the thermostat, then the heat would blow hot/cold/hot/cold, I didn't realize you had to bleed the air out of the system after changing the thermostat. I did that and now the heater and engine run great.

Aug 26, 2017 | 2006 Nissan Xterra

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I have a 1996 dodge intrepid that keeps over heating. I've changed the thermostat and now it over heats sometimes. The auto store told me I had to bleed the thermostat but didn't tell me how to do it. How...


If the thermostat is working, and there is no visible coolant leak or water/coolant in engine oil dipstick, then it could be the electric fan, try running your car and when it starts to overheat check to see if the fan is working. Good Luck.

Nov 01, 2010 | 1996 Dodge Intrepid

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Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

Jan 06, 2010 | 2004 Chevrolet Impala

3 Answers

Overheating and no hot air from heater.


Leave rad cap off when starting from cold, turn heater(not defrost) on, and top up coolant in rad as you go, to about an inch or 2 from top of rad. Let engine run with cap off until your rad fan comes on & off 3 or 4 times. Every once in a while, rev engine slightly for 5-10 seconds to help bleed air out faster. After about 3 or 4th time fan comes on, you should be o.k. to put cap back on all the way & fill bottle to proper level. Heat should be there now. Give it a try & let me know how it goes.

Mar 29, 2009 | 1998 Ford Contour

1 Answer

No heat and just changed out my coolant. gage is all over the place. How do I replace thermostat. I do see a leak but have smelled coolant it is very cold and I need heat


If you refilled coolant in rad and didn't leave cap off & run it for a while with heat (not defrost) on inside vehicle, you probably have an airlock.
Let it run until rad fan comes on, & off, 2 or 3 times, and top up rad as needed 1"or 2" from top while it's running. Keep an eye on temperature gauge, that it doesn't overheat, and if it does start climbing too high, shut it off & let it cool down, and retry. If you need to do thermostat, we need to know exactly what engine you have. If you need to get it going fast, just bleed it as described and you may be alright for now. Where is this leak & how bad is it?

Feb 21, 2009 | 1998 Ford Taurus

1 Answer

No Heat


ck the coolant first with it cold if it is full take to someone and have thermostat cked does it overheat

Jan 23, 2009 | 1995 Chevrolet Tahoe

1 Answer

'98 Century--Sporadic over-heating


Be sure to have heater (not defrost) on when refilling rad with coolant, and leave cap off until rad fan has come on & off 2 or 3 times, then replace cap. Airlocks are common on vehicles cooling systems, and will cause symptoms you are describing.

Dec 25, 2008 | 1998 Buick Century

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