Question about 2003 Suzuki Grand Vitara

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Overheats once or twice a day .,if engine left to idle temperature gauge returns to normal within one or two minutes radiator water pump temperature switch thermostat have all been checked plus oil change any ideas?

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  • Jay Glendenning
    Jay Glendenning May 11, 2010

    Have you checked the belt tension?

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Have you check the radiator fan? The're 2 of them but 1 work with the AC.

Posted on Jun 19, 2009

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Is it normal for coolant bottle to boil?


No it is not. Is your engine running hot according to temperature gauge? That is the coolant return which means the coolant was too hot coming out of engine and returning to rad for cooling. You obviously have a cooling system problem whether water pump, thermostat, rad, cooling fan etc. Give more details on what happens when starting from cool, and sittting idling, driving etc as far as temperature gauge reads and how hot engine gets. Be careful not to overheat engine, if you haven't already

Nov 21, 2013 | 1999 Dodge Durango

4 Answers

2004 Ford Explorer Sports Trac overheating. I cant find anything that shows any signs of leaking. I've changed the thermostat twice, flushed the radiator and also changed the clutch in the fan to...


Did the engine overheat before the water pump was replaced? If so, you may have a warped cylinder head and/or blown head gasket.

Was the radiator full of rusty-colored liquid before you flushed it? If so, your radiator is probably restricted with rust deposits in the cooling tubes. Flushing WILL NOT get this stuff out. The radiator MUST be replaced if this is the case. Your heater core is probably not in real good shape either, so you should be expecting some heating problems this winter.

If the above is not the correct answer, then you should check to make sure the temperature gauge is not "LYING" to you. This could be caused by a defective gauge, a bad temperature sending unit, or faulty wiring.

The way to check this is with a scan tool that can read engine data and an infrared thermometer. While reading the coolant temperature data from the computer, check the cylinder head temperature with the infrared thermomometer. The readings you get should be within 5 degrees (F) of each other. If the computer data does not match the thermometer within the 5 degrees, then the sending unit for the computer should be replaced.

Then look at the gauge to see if the gauge reading is appropriate to the temperature readings that you took. Normal operating temperature is between 190 and 230 degrees. This should place the gauge at slightly to the right of center to about 5/8ths of the way to HOT. If the readings you took are OK and the gauge is reading higher than this, then you should try replacing the temperature sending unit for the gauge and see if that fixes the problem.

Please note that there are TWO temp sending units: One for the gauge and one for the computer.

Aug 30, 2011 | 2004 Ford Explorer Sport Trac

1 Answer

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

1 Answer

Why my engine over heats only when the a/c has been on for about 30 minutes. Turn the a/c off and the temperture returns to normal within minutes.


a/c systems generate heat around the radiator. But, the antifreeze in the radiator should be able to be cooled down by the fan even when the a/c is on.

I would flush and fill the radiator system installing 50/50 antifreeze/water solution.

How bad is the car overheating? Is it on a gauge that tells you how much it is over normal operating temperature?

Jun 25, 2010 | Cars & Trucks

2 Answers

The coolant in the reservoir boils out of vent tube and overheats the engine. The temp gauge also dropped to C instead of going to H when this took place. Is this syptomatic of a water pump failure,...


Refill the coolant system reservoir when cold. Ensure the cap has a good seal and is tightened down properly With the hood raised, restart and allow the engine to idle until running temperature. 1) No agitation should be seen in the reservoir water, certainly no stream of bubbles or violent movement. If there are violent signs then this points to a blown head gasket. 2) The top rubber hose from the engine to the radiator at some point should become hot. Keeping checking the temperature gauge from time to time to see if the temperature is rising. If there is no temperature gauge response then there is something wrong with the gauge circuitry. 3) at some point here the fan (if electric or clutch operated should become engaged. If the electric fan never comes on either the temperature sensor is faulty, the fan fuse or solenoid relay are not functional or the fan motor is blown. 4) Within a few more minutes the lower hose exiting from radiator to the engine should also become hot. If these two events happen then your pump is circulating the water and the thermostat is functioning.If the top hose does not become hot you need to check your thermostat. If the top hose does become hot but the bottom one does not, even after quite a while, then either the pump is a fault or there is blockage; maybe due to sludge in the radiator core or pipes. To check the thermostat simply remove it and drop it into a pan of boiling water. Immediately you should see the thermostat pop open. Take the pan of water off the heat and watch the thermostat. After about five minutes when the water has begum to cool the thermostat should pop closed again. These events are not subtle so if they are not seen it is likely that a new thermostat will be needed. In the event the system is blocked simply remove coolant hoses and use a high pressure hose to flush the radiator and system clear of sludge. If there is air trapped in the system try putting the interior heater on to full to help flush them out. In an emergency putting on the interior heater can assist the main engine cooling.

Jun 20, 2010 | 1994 Chrysler Concorde

2 Answers

The radiator keeps boiing, even after a short trip and the car tends to overheat, also have had to replace 2 engine coils in the last few weeks. Actually a suzuki crescent cultus.


Hmm, open the radiator cap and check if the coolant is calm if it is vibrating or tends to jump out the head gasket needs replacement

Jan 04, 2010 | 1996 Suzuki Swift

2 Answers

1996 Jetta appears to overheat but no coolent loss


the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob

Aug 16, 2009 | 1996 Volkswagen Jetta

2 Answers

Car overheats at idle, ok when at speed


You will need to Change your Thermostat. A bad Thermostat will cause the Overheat Problem as Stated above. Also, Check you Coolant Level, and see if the Water Pump is Pumping Water through the Radiator. Please Rate my Response, I need all the Help that I can Get! Thanks!

Jan 26, 2009 | 1993 Saturn SL2

1 Answer

Overheating engine: termo guage at the middle during idle


The Temp gauge should read in the middle of the gauge at operating temperature. This is normal. The radiator fan should come on after idling (not driving) for 20 minutes. The fan should also come on when you turn on the AC. Are you experiencing overheat problems?
Please reply if you have overheating issues.

Oct 16, 2008 | 1994 Toyota Corolla

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