Question about 1997 Pontiac Sunfire

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I change thermostat, water pump, housing coolant sensor, but yet when i start driving the tempeture goes up and down and the heat gets kind of cool not all

When i turn the car on it warm and tempeture is normal,but when i start drivin the tempeture drops and heater gets kind of cool, and then the tempeture goes up again heater is fine. this happends as i drive every day.

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  • Expert
  • 60 Answers

Poor coolant flow water pump? air lock in system? bring to operating temp shut down than open air bleed screws.

Posted on Jan 03, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

localwonder
  • 6784 Answers

SOURCE: 2000 Sunfire coolant problem. Engine overheating,

ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.

Posted on Mar 13, 2009

  • 1118 Answers

SOURCE: 2006 pontiac grand prix vary little or no heat

Are you sure you got all the air out of the cooling system? Air pockets are very common problem when you do any work to the cooling system. An air pocket will do what you discribe.

Posted on Mar 18, 2009

dennymulford
  • 1055 Answers

SOURCE: heat fluctuation on temp gauge

change the sending unit to the fan, if that doesnt work check for power too the fan or even a bad fan

Posted on Mar 22, 2009

RJones1125
  • 373 Answers

SOURCE: 89 firebird stalling when warm. then wont turn back over

when you overheat an engine. certain parts expand more than usual. like pistons, crankshaft and camshaft bearings. im afraid its time to overhaul the engine. inspect for cracks etc...
check the oil on the dipstick...if it looks like a milkshake...you cracked something...head or block......sorry dude for the bad news. good luck

Posted on Apr 08, 2009

  • 1348 Answers

SOURCE: Pontiac Grand Am SE running hotter than normal

check the fan switch and make sure the cooling fan is coming on.

Posted on May 22, 2009

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2002 pontiac aztec tempeture guage goes up when parked but drops back down to cold when i start driving. whats wrong with it?


sounds like you might have some cooling issues, this vehicle requires dexcool coolant. Thermostat might need to be changed.

Jan 11, 2012 | 2002 Pontiac Aztek

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97 transport 3.4 engine- New radiator, thermostat,temperature sensor, water pump and new low coolant level sensor. Temperature guage goes to 260 degrees but engine does not over heat. Bled air from cooling...


Check the operation of the cooling fans at the radiator. While idling disconnect the coolant temp sensor at the top left (drivers side) of the engine. It will be a 2 wire connector near the thermostat housing. When disconnected the coolant fans should come on immediately, if not you have an electrical issue with the relays or blown fuse. Check the fuses first in the underhood electrical panel. Next swap the cooling fan relay with an identical one next to it, if the fan works the relay is open.

Mar 30, 2011 | 1997 Pontiac Trans Sport

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96 TOYOTA TACOMA 2.7 ...HAVE REPALCED THERMOSTAT 3 DIFFERNT TIMES CHECKED HOSES KEEPS KICKING CODE INSUFICENET COOLANT TEMPETURE LOWER LOOP... WATER PUMP DOESN'T LEAK OR MAKE NOISE BUT COOLANT DOESN'T...


If it weren't for you saying lower hose is cool, it would be a bad coolant temperature sensor. But it sounds like you have at least a very big air pocket in engine or the impeller on waterpump isn't turning.

Mar 21, 2011 | Toyota Tacoma Cars & Trucks

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2005 3.3 caravan heater only provides heat off idle. Fan sometimes does not come on as well. thermostat was replaced twice in summer for O/H.


You probably have air pockets in your cooling system. I have fixed a few of them by removing the Coolant Temperature Sensor just behind the Thermostat Housing. They can be kind of hard to get to on 3.3L Engines. Anyway, remove the sensor and pour antifreeze into the radiator until antifreeze pours freely out of the sensor hole. Then re-install the sensor. You may have to top-off the radiator after the sensor is re-installed.

If this does not fix the problem the you could have a bad water pump. Sometimes the stamped-steel impeller on the water pump gets corroded to the point where it cannot circulate the coolant properly.

Dec 05, 2010 | 2005 Dodge Caravan

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Location of thermostat on 2002 olds alero 2.2


Thermostat Removal & Installation 2.2L Engine To Remove:
  1. Remove the exhaust manifold. If equipped with an automatic transmission.
  2. Drain the cooling system.
  3. Remove or disconnect the following: chevy_cav_02-04_tstat.gif

    • Thermostat housing to water pump feed pipe bolts. chevy_cav_02-04_feedpipe.gif

    • Thermostat housing to water pump feed pipe.
    • Thermostat.
To Install:
  1. Install or connect the following:
    • Thermostat.
    • Thermostat housing to water pump feed pipe.
    • Thermostat housing to water pump feed pipe bolt.
      1. Tighten bolt to 89 in lbs (10 Nm).
    • Exhaust manifold if equipped with an automatic transmission.
  2. Fill the cooling system.
2.4L Engine To Remove:
Thermostat assembly 2.4L 87953024.gif

  1. Drain the cooling system.
  2. Remove the exhaust manifold heat shield.
  3. Remove the coolant inlet housing mounting bolts through the exhaust manifold.
  4. Raise and safely support the vehicle.
  5. Remove the coolant inlet housing stud from the oil pan.
  6. Remove wheel and tire assembly.
  7. Remove the engine splash shield.
  8. Remove the mounting bolts from the transaxle-to-engine block support. Remove the support.
  9. Remove the coolant housing pipe.
  10. Remove the thermostat.
  11. Clean the mating surfaces.
To Install:
  1. Install the thermostat.
  2. Install the coolant housing pipe.
  3. Install and secure the transaxle support-to-engine block mounting bolts.
  4. Install the engine splash shield.
  5. Install the wheel and tire assembly.
  6. Install the coolant inlet housing stud to the oil pan.
    • Tighten to 19 ft lb (26 Nm).
  7. Lower the vehicle.
  8. Install the coolant inlet housing bolts through the exhaust manifold.
    • Tighten the coolant inlet housing bolts to 10 ft lb (14 Nm).
  9. Install the exhaust manifold heat shield.
  10. Fill the cooling system.
  11. Inspect the system for leaks.
3.4L Engine To Remove:
  1. Drain the cooling system.
  2. Remove the air cleaner.
  3. Remove exhaust crossover pipe.
  4. Disconnect the surge tank line fitting from the coolant outlet.
  5. Remove the thermostat housing to intake manifold bolts.
  6. Remove the thermostat housing outlet and thermostat.
To Install:
  1. Install the thermostat and housing outlet.
  2. Install the thermostat housing bolts.
    • Tighten the thermostat housing bolts to 18 ft lb (25 Nm).
  3. Install exhaust crossover pipe.
  4. Connect the surge tank line fitting to the coolant outlet.
    • Tighten the fittings to 15 ft lb (21 Nm).
  5. Install the air cleaner.
  6. Fill the cooling system.
  7. Inspect the system for leaks
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Oct 14, 2010 | Oldsmobile Alero Cars & Trucks

1 Answer

Want to know how to change a thermostat on my 2004


It Depends on which engine you have, this is how it goes for both. I use a little RTV with a new ring as well.

THERMOSTAT REPLACEMENT (4.2L ENGINE)
Removal Procedure
1. Remove the necessary coolant from the radiator.
2. Remove the generator.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.
Installation Procedure
1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts.
Tighten: Tighten the bolts to 10 N.m (89 lb in).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
5. Install the generator.
6. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
7. Inspect all sealing surfaces for leaks after starting the engine.
THERMOSTAT REPLACEMENT (5.3L ENGINE)
1. Drain Radiator and remove the radiator outlet hose.
2. Remove the water pump inlet bolts.
3. Remove the water pump inlet and thermostat from the water pump.
Installation Procedure
IMPORTANT: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts.15 N.m
3. Install the radiator outlet hose.
4. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
5. Inspect all sealing surfaces for leaks after starting the engine.

Mar 17, 2010 | 2004 GMC Envoy

1 Answer

1992 Honda Accord cooling problems--Please help!


I smell a bad water pump.. If your water pump is bad you get very poor coolant circulation not to mention at a stand still(red light) you get less air flow to cool down the coolant. Since you have poor coolant circulation you wont get the proper coolant to heater core as well so you get less warm air threw heater. Not to mention that when a water pump is faulty and you have a thermostat it allows even less coolant circulation compared to a constant flow of antifreeze. I would have it checked. Good luck

P.S, I am assuming that your electric fans are working and you have to proper mixture of antifreeze and water.

Dec 07, 2009 | 1992 Honda Accord

1 Answer

Car over heating


There could be a number of things causing your vehicle to overheat, you'll need to do some trouble shooting to find out what the problem is, here's a list of things that might help,
  • Check the thermostat, if it's defective replace it.
  • Check the coolant in the reservoir tank, it should be at the proper full level.
  • Sometimes when you change a thermostat there's a possibility you could get air in your coolant lines from having the coolant system opened up, this could keep your coolant from circulating through your system, if so you would need to bleed the air out of the coolant system.
  • The water pump should be inspected for leaking coolant out of the weep hole's, when a water pump go'es bad it may leak coolant, which would mean the seals on the pump are bad, also listen for squeeling noise's coming from the pump when the car is started, if it squeels the bearings are bad, there is also a possibility the water pump fins are wore down from corrosion, there is no way to inspect this without removing the pump.
  • check the drive belt for wear and tension, a bad tensioner or a bad drivebelt could have an effect on the operation of the water pump.
  • check the pressure cap on the coolant reservoir tank for good pressure, when you remove the cap you should hear a hissing sound this means you have good pressure in your cooling system, check for corrosion or build up on the cap, clean the cap if nessary, also check the coolant in the reservoir tank, it should be clean, if not you might need to have the cooling system flushed.
  • check the large upper and lower radiator hose's for cracks, swelling, and proper coolant flow.
  • Check the operation of the cooling Fan, and circuit, cooling fans use relays and fuses, some vehicles use more than one cooling fan, if your vehicle has two cooling fans there should be two relays and two fuses one for each fan, first visually inspect the fuses if one or both are bad replace them, when a relay is activated it sends voltage to your cooling fan, you can test the relay or relays for continuity by removing them and doing a proper continuity test according to your relays circuit diagram.
  • Check the coolant temperature sensor, most coolant temperature sensors are located directly in the thermostat housing, this sends information to your ecm which determines when to turn your cooling fan on and off, if it's defective replace it.
  • Inspect the radiator grill for any debris build up or damage.

Mar 23, 2009 | 2001 Ford Focus

2 Answers

Thermostat?


It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.

Feb 12, 2009 | 2004 Chevrolet Blazer

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