Question about 1999 Dodge Grand Caravan

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Van overheats when in idle with ac on

If we are in slow moving traffic our 1997 grand caravan overheats until we turn the ac off then it goes back to normal, if we are moving fast no problems. The fans come on and the coolant level is good so what could it be. WE live in nevada so on a 115 degree day this can be very inconvenient

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There are 2 fans in the front of this van. One will run almost the whole time that the engine is running. The other will only come on when the engine reaches a certain temperature when the a/c is off. When the a/c is on then both fans should run all the time. The fan relay is usually the problem in this situation. Evin though the secondary fan may come on some That does not mean that it is on the whole time that the a/c is on. If it is operating correctly then the motor may be week. Also be sure that the radiator and condenser coils are clean and free of leaves or debris between them. Hope this helps. good luck.

Posted on Jul 18, 2009

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High Speed fan relay is not activating the fan. replace it with a relay of the correct type and amperage rating.

Posted on Jul 18, 2009

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1 Answer

My engine overheat when A/C is running on a slow moving traffic or on parking.


I would check and see how much air is actually moving thru the radiator. The fan may not be running fast enough or you may have debris blocking the air flow. Also make sure the system is full of coolant and no air pockets.

Nov 03, 2015 | 1995 Jeep Grand Cherokee

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Overheating problem, what is the most probable cause?


You need to stop using it immediately before you
cause some damage or more than you may already have
That is just common sense. It should not overheat or
be any different than it was in the past without problem

The car has to be checked over/diagnosed,tested,etc for
various issues to resolve

Borrow or Rent a car until resolved

No way to guess at the problem

You should have some type of codes avail even
if the check light isn't on,you need professional help
to get a start on resolving

The timing belt maybe worn & jumped or the head gasket
bad.

Over heating isn't usually a cheap repair unless the thermostat
sticks partially closed

The RPM moves around the car is 11 years old,so it may just
need a though going over

Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs
and such

If you depend on a repair shop to do things & don't
have the knowledge to request work done throughout
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Sep 06, 2012 | 2002 Chevrolet Prizm

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2001 Dodge Grand Caravan Sport 3.3 Wifes van started running very rough last week while in slow moving traffic then stalled out. Code showed "map sensor", got a new one and installed. No change....


A bad vacuum line will cause this code also. Also it will cause a rough idle and stalling. Open the hood and listen for a hissing sound. track it and you,ll find the leak. Also I would just check all the lines to make sure another in not ready to go.

Jul 13, 2011 | Dodge Caravan Cars & Trucks

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My toyota revo van model 2001 is getting overheat when there is heavy traffic. However if I will turn off the aircondition the tempe rature will go back to normal level. Can you help me please


Guys, I have Toyota Revo 2001 manual diesel. Its getting overheat only during idling or heavy traffic. We overhauled the radiator, new radiator cap and hoses, new thermostat, the fan is ok. the pump is quiet (no noise). Still, its getting overheat. please help me guys! Thanks!

May 03, 2011 | 1997 Toyota Previa

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2004 GTP Grand Prix overheating in slow traffic cools down when on highway. What would cause this? Previously replaced was thermostat, water pump & both radiator hoses.


Are the cooling fans coming on during normal operation? If your ac works turn it on and see if it overheats with ac on.If it does not overheat the fans are not operating properly under normal operating conditions.The ac will force the fans on. What you can do to start is just let the car idle in park and see if fans will come on normally. The coolant temp should reach 200-210 before the fans will come on. Make sure the air is off at this time. If we can verify the fans are working or not working properly we can go to the next step. Let me know what you find out.

Oct 08, 2010 | 2004 Pontiac Grand Prix

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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

Radiator fans will not go on


check fuses and relay to fan, if not it, check wiring to fans.

Mar 14, 2009 | 2001 Dodge Grand Caravan

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Bmw 1998 318ti auomatic


verify the engine cooling fan runs at idle without the AC on, it should come on around just past 1/2 scale on the temp guage, do not let it overheat! these engines have aluminum cylinder heads and u can blow the head gasket out, let me know the results

Jan 11, 2009 | 1999 BMW 318 ti

2 Answers

Overheats


my car was doing the same..u should look at the waterpump c if there is any green stains on the drip hole.....also check forleaky hoses and holes in the radiator...i would check the waterpump first tho

Jul 27, 2008 | 1997 Dodge Caravan

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