Question about 2001 Saturn L-Series

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Saturn overheating Installed new radiator, heater core, thermostat and fan module. It still runs hot.

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  • Dan Jacobs
    Dan Jacobs Mar 23, 2014

    Hi Michael W Parker, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box? driving in town on the freeway sitting still?

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  • 49 Answers

Your problem is the coolant temperature sencer is bad this will cause the car to overheat or false read it's over heated change that and and you should be ok from there remember saturns have two Sencers so finding the right one could be a problem

Posted on Mar 23, 2014

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Overheating new heater core, radiator, thermostat, fan module


This problem is caused by the coolant temperature sensor and this will cause you to think the car overheated but the gauge isn't working properly as supposed to

Mar 23, 2014 | 2001 Saturn L-Series

2 Answers

93 GMC Safari overheating. This happened spontaneously. Runs hot very quickly when I drive it. There is antifreeze in both radiator and overflow res, overflow res fills up more after driving a bit. ...


It would appear your thermostat is stuck in the closed position , find where it is on your engine, drain coolant and remove thermostat housing and stat, replace housing(liquid gasket OK) and coolant. now run engine, turn heater controls to hot leaving filler cap off, top up any water to max and replace cap now warm up to temp until fan comes on. if all ok replace thermostat with a new one and new gasket, you could also flush the sytem out at the same time with a hose pipe by loosening one of coolent pipes and flush radiator.

Nov 04, 2013 | 1993 GMC Safari

1 Answer

99 ford contour gauge shows running hot. Change both sensors near thermostat and the thermostat. Flushed system and burped it. Ac or heat makes no difference. Fans seems to be working. Any ideas?


Is it ACTUALLY overheating? Check for heat at the top and bottom radiator hoses, and at both heater core hoses. If one is cold then your radiator or your heater core may be plugged and in need of a individual flush.

Oct 29, 2013 | 1997 Ford Contour

1 Answer

Running hot when car is't in motion


1.check coolant level---must open bleed valve above thermostat when adding coolant. 2. Are fans radiator fans running when car ovrheats & is air comming off of radiator hot? 3. Check/Replace thermostat. 4. There is a plastic elbow that connects from the intakke manifold to the engine block on the passenger side of car that arrre notorioous for cracking / leaking.... 5. The heater core on `05 Impala does not close when heater is turned off so does not benifit overheating by turning heater on.

Jan 12, 2013 | 2005 Chevrolet Impala

2 Answers

Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot


disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

May 08, 2012 | 1995 Toyota 4Runner

3 Answers

Took out the thermostat, replaced the radiator, the water is circulating in the radiator but it is still running hot. what do i do next?


Overheating can seriously damage a car's engine if left unchecked. Although overheating simply means that a car's engine temperature exceeds normal operating temperatures, the causes of overheating are varied. What follows is a brief list of some of the most common causes of engine overheating.

    Faulty Radiator
  1. A car that overheats will often have a faulty radiator. A radiator is responsible for cooling hot engine coolant that picks up heat from inside a car's running engine. A radiator "radiates" the heat from engine coolant out into the outside air. A faulty radiator loses its "radiating" effects and allows engine coolant to become overheated, thus rendering it ineffective at adequately cooling and engine.
  2. Faulty Water Pump
  3. A faulty or malfunctioning water pump prevents adequate engine coolant flow and can cause a car to overheat. A water pump serves to pressurize and propel engine coolant throughout a car's engine and radiator to increase the heat-reducing capabilities of engine coolant. A faulty water pump loses its ability to adequately pump and propel engine coolant, and can cause a car to overheat.
  4. Coolant System Leaks
  5. A leaky engine coolant system reduces the level of circulating engine coolant, which increases engine temperature and leads to engine overheating. Radiators, water pumps, and coolant system hoses and seals--all of these coolant system parts can develop leaks, which can result in low coolant levels and engine overheating.
  6. Faulty Thermostat
  7. A car thermostat regulates the flow of engine coolant. A thermostat is a heat-sensitive valve that opens when a car engine reaches a set operating temperature and closes when a car engine is cold and warming up. If a thermostat gets stuck in the closed position, coolant will be prevented from reaching the engine, which will quickly lead to engine overheating and potential engine damage.
  8. Low Engine Oil Level
  9. Engine oil, in addition to lubricating an engine's internal parts, helps to keep engine operating temperatures reduced by eliminating friction within the engine. If engine oil levels are low, friction and heat build up inside an engine, a condition that causes increased engine operating temperatures and can lead to engine overheating.

Jan 15, 2011 | 1998 Isuzu Rodeo

1 Answer

I had the water pump replaced. Is there a relay or a valve that controls the heater, or would a thermostat control it???


i didn't see you last posting about your water pump but theres is a tiny radiator called a heater core. it has the same hot water running through it as your big radiator and engine have.so when you turn your thermostat to hot and kick on the fan the fan blows through the heater core and wallaa you have heat you probably need a thermostat.if you have no heat and it is overheating hear and there that's probably what you need.make sure you see if you filled the radiator up all the way when you changed the water pump.

Nov 18, 2010 | 1998 Cadillac DeVille

2 Answers

My trooper keeps over heating, I have changed the fan clutch,the radiator, the radiator cap. I have even taken the thermostat out. and it still runs hot. no crack in the block, could the heater core be...


The heater core being clogged would affect whether the interior gets hot air when set to hot temperature.

The heater core is like a very small radiator that wouldn't affect the temperature of the engine very much.

May I ask how hot it gets? Engines can get to 220 deg. F or 230 deg. F and still be considered to be running in a normal temperature range.

Sep 18, 2010 | 1989 Isuzu Trooper

3 Answers

Overheating radiator without leakage


I posted this in a different web sight I hope it helps.


Re: Overheating and blowing cold air
I have been a mechanic for 20 years. Your problem is the heater core is plugged. The cold water from the radiator blows directly at the thermostat keeping it closed even when you are overheating! BAD DESIGN!! If you look at the water flow charts in AllData you will understand. If you rev the motor to 3,000 rpm's the turbulent HOT water at the water pump impeller (near the thermostat) will reach the thermostat to open it and the car's temp will fall very fast to the correct temperature. If you remove the thermostat it will not overheat but will run way to cold. If you bypass (loop) the heater core it will not over heat.

The hot water that leaves the heater core returns to the engine at the thermostat. It is the only hot water introduced to the thermostat to keep it open and allow the water to flow from and to the radiator. I normally just back wash the heater core and get large chunks of rust flake out then its fixed. Back wash then froward wash repeatedly many times. Also flush out the motor so you don't re plug the heater core. I hope you have now blown the head gaskets or cracked a head yet. Make sure to run the proper coolant in the car so you don't promote more rust flakes. And bleed the air out as mentioned in detail by other posters.

Nobody knows this little secret. Not even Subaru mechanics at the dealer, no TSB (Technical Service Bulletins a special note after the fact to mechanics). After days and days of trouble shooting a 1993 Subaru Impreza (2.0?) I looked at the water flow chart and then it was clear what was happening. This phantom overheating problem stumps the best mechanics and sends many Subarus to the crusher.

http://www.subaruoutback.org/forums/...threadid=17264

Jan 16, 2010 | 1990 Subaru Legacy

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