Question about 1998 Dodge Grand Caravan

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Radiator whines and overheats when not moving

Radiator fan whines even when vehicle is off and overheats when sitting in traffic, but cools down when driving. Thermostat was changed and radiator fan regulator was changed and problem still did not go away

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  • Dodge Master
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Have someone flush cooling system & check condition of rad for debris in front of rad & blow or spray it out as necessary. Next time it runs hot, turn your heater temperature up high, blower fan on high, and see if gauge starts to come back down a little. If it does, my guess is your rad needs replacing, or at least consider trying a good reverse flushing of the system first, then rad.

Posted on Apr 22, 2009

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1 Answer

Temp gauge goes up when sitting in traffic and at light but goes down while driving


Check the operation of the radiator fan and relay. This has typically failed under these circumstances.
Once the vehicle is in motion, there is enough air being forced through the radiator to cool it down.
When sitting in traffic, it's the fan's job to cut in and pull air though the radiator.

Nov 12, 2012 | 2001 Mazda Millenia

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1999 Protege overheating. Changed thermostat, radiator, water pump and burped the new radiator. Runs fine on freeway, but will overheat in stop and go traffic.


if your vehicle has electric cooling fans it could be that they are not working,if this is the case when you are on the freeway you don't need the cooling fans you only need them when the vehicle is not moving as there is no air going through the radiator to keep the engine cool......hope this helps......cheers.

Jul 21, 2011 | 1999 Mazda Protege

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Temperature gauge is fine with going down the road, but once i stop in traffic and sit in traffic for lights or cruise at a low speed.. temperature rises... to the middle mark and over... what could that...


sounds to me like you radiator fan isn't running. I say that because cooling is fine while moving at a good speed but cooling gets worse as the vehicle is stationary or low speed. Check the fan and make sure its working if it works then will need to check the thermostat behind the fuel pump it may have gone bad.

Jun 23, 2011 | 2003 Buick Rendezvous

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I have a 2001 Chevy Impala. It's started overheating after sitting in one stop for a long time. As long as your moving the car is fine but as soon as your in traffic or stopping the temp rises. It...


Check to make sure the cooling fan is kicking on it is mounted to the back of the radiator once the car gets up to temp it should kick on to coll the radiator when you are sitting in traffic on some cars if you turn the ac on the computer will automatically switch the cooling fan on

Jun 23, 2011 | 2001 Chevrolet Impala

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My engine temp gauge goes way up when the car is stuck in traffic, when I begin to roll the temperature gauge goes back down. I assume that this is a sensor issue, can this be changed easily?


I would assume that the sensor is probably doing EXACTLY what it is designed to do....measure engine temperature! An engine will get hot when sitting in traffic if the radiator cooling fans are not working. The engine temperature will then go back down when the vehicle starts moving and air begins to flow through the radiator.
Get your radiator cooling fans checked!

Please also review this article: What Else Could Be Wrong?

May 09, 2011 | 2000 Hyundai Elantra

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I have a 2004 Pontiac Sunfire. When the car is in idle the air blows out hot and the Temperature gage rises and the car over heats. When the car is moving the air blows out ice cold and the temperature...


Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.

When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.

I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.

It will take a little diagnostics, but it is not too difficult to chase it down.

May 03, 2011 | Pontiac Sunfire Cars & Trucks

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My problem just about heating every think is OK in cooling system but when traffic is low my car become overheating...


If your car is overheating then everything is not ok in the cooling system. If it happens mostly in traffic make sure the coolant level is not low and that the cooling fans are functioning.

Mar 08, 2011 | 1992 Toyota Corolla

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

A/c blows hot air when the car is not moving but it will blow cold air when the car is moving.


Check to see if your electric cooling fan is working when the vehicle is in park with the engine and a/c running. If the fan isn't running then the a/c won't be able to blow cool air as it can't get rid of the heat through the condensor which is located ahead of the radiator. When you are driving over about 35 mph there is enough air being forced through the condensor and radiator to get rid of the heat and the a/c will start cooling properly again. If the fan isn't running and you sit with the car idling long enough [such as in heavy traffic] then the engine may overheat as it also has no way of cooling if the fan isn't working. Usually this fan is powerd by a 30 amp Maxi fuse but each model is a bit different. Your owners manual should have an illistration of the fuses and what they power. Good luck, hope this helps a bit!

Aug 11, 2010 | 2008 Chrysler Pt Cruiser

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1998 Cadillac DeVille Overheats


The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.

Jun 16, 2009 | 1998 Cadillac DeVille

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