Question about 2000 Pontiac Montana

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Vehicle overheating replaced thermostat gets heat then goes cool but when i rev the engine it starts to blow hot heat the more i rev the hotter it gets

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Air in system, bleed system manually by filling up reserviour then drive until operating temp. Leave vehicle to cool 2hours or so then refill again. repeat until heat is steady and guage stays normal

Posted on Oct 14, 2010

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1999dodge ram has cool heat at idle gets hotter when you drive or rev engine


Sounds like a bad thermostat, REPLACE IT! And make sure coolant is at proper level. A thermostat should be closed when cold, and wide open at hot engine. if it fails, it will not stay closed at cold engine, or its stuck. When stuck water flows through by pass at thermostat. and does not heatup because thermostat does not hold coolant back until it gets hot. God-Bless!

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Before i purchase a water pump....How can I tell if I have a working water pump....????


Typically a water pump is only replaced if it is leaking. If your engine is overheating it is far more likely to be a cooling fan or thermostat.

If the water pump is working and the vehicle is overheating and you are sure the coolant level is full than turn on the heater to full hot and the fan to full high. If it blows plenty of really hot heat for more than 10 minutes the water pump is working. If it starts hot and then goes cold or significantly cooler than you may be on the right track.

You failed to post a vehicle make, model, year, and engine size. Some vehicles have plastic impellers on there water pumps and are known to fail frequently.

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How are you sure it is overheating? Temp gauge? Most likely are stuck thermostat, bad fan thermostat switch, bad fan. bad head gasket. Coolant going into overflow when hot is how that system is suppose to work. As it cools, fluid is drawn back into radiator. It it is not really overheating, bad radiator cap can allow coolant into reservoir more than normal.

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Code P0118 for my hyundai elantra 2008, is it good to remove the thermostat, especially during HOT season here in saudi arabia?


The thermostat not only allows the normal heat cycle but it also allows the coolant to be able to cool itself before getting returned to the engine block.. If you remove the thermostat then you are not giving the coolant enough time to cool itself before going back into the motor. This will actually make the vehicle run hotter then cooler. I would recommend looking into the lowest temp thermostat available for your vehicle and look for an additive to help cool better..

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If the cooling system is full of liquid, the thermostat may not be closing when the engine is cold.

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1990 dodge dakota 2.5 over heats temp gauge erratic


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html

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Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------

Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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This details will help.Thanks.

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1997 Cirrus is still overheating... The heater does not blow out hot air...would the heater core cause the vehicle to overheat? if not, what other problems am I looking for, I was loosing anti freeze...


it appears that you have a large air pocket/low on coolant. The engine is getting hot due to the lack of coolant but there is no heat because nothing is flowing through the core.

Feb 20, 2011 | Chrysler Cirrus Cars & Trucks

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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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My car was overheating and antifreeze was leaking from underneath and my waterpump was cracked so i got it replaced, but still it keeps overheating so i leave the a.c. on and that works until i start to...


most likey if you changed the thermostate and gasket and antifrezze and water your fan clutch has gone bad an needs to be replaced the clutch works on a friction device the hotter it gets the more the friction plates ingauges causeing the clutch to turn much faster thush cooling the engine. Without this cooling action this will destroy the engine and trans misssionsdm without this cooling so this is true to this date the cooling in fan fan has to work to be able to keep engine cool. now days they call it a puke tank to keep from burning up the engines and is designed so that hot water is pushed out of the tank into the overflow tank so that when it gets hot there us bo waiting for the fluid to be sucked intothe radiator it's done automatically and saves the engines. So small changes have stuck with us and saved the lives of people in the miliatry and in the non milataray systems..

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1 Answer

1995 ford windstar overheat after replacing the thermostat


Let your engine warm up with the rad. cap off and see if the coolant level drops. and make sure your overflow is full. It blows cold air because there is no water getting to the heater core. And it shows a normal(ish) temp because the water needs to be touching the temp. sensor. I really do think there is air in the system and there is not enough coolant but hard to tell from here. Also as with overheating any time make sure to check your oil and look for any coolant as the head gasket seldomly holds together if the motor overheats.

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