Question about 1999 Dodge Grand Caravan

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Radiator fan and a/c fan does not turn on and car overheats.

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  • Master
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Check both fans to see that they turn freely (when engine is cold). Replace a fan that is stuck or hard to turn. If you find and fix any bad fans, then look for the fan relay which is buried behind the air filter box next to the radiator. You have to remove the air filter box to get to this relay which is a solid-state device. The connector plugs into the bottom of the device and it controls both fans together. A bad relay will look fried with heat discoloration. Blow out the radiator core with compressed air from the engine side to get rid of the accumulated bugs and other debris.

Posted on Jul 17, 2009

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  • Master
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Could be the relays for the fans or the coolant temperature sensor. Testing with a volt meter for sensor is needed there. The relays can be replaced with known good ones or new ones from the store. The relays will be in the engine compartment power distribution center/fuse box.

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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SOURCE: 2004 chevy venture fans would not turn on, and it starts to overheat

change the fans relay or ac\clutch relay

Posted on Aug 24, 2008

  • 112 Answers

SOURCE: radiator fan not turning on 02 intrepid

maybe the sensor that turns on the fans might of gone bad . . and turning on the ac when engine is gettin hot is not going to help instead turn on the heater to reduce the heat , also overheating causes hoses and gaskets to get soft and get destroyed

Posted on May 27, 2009

motor1258
  • 6674 Answers

SOURCE: radiator fan will not turn on and car overheats.

Check rad fan relay & or fuse under hood in fuse/relay box on drivers side fender area. Map is on underside of cover.

Posted on Jul 12, 2009

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Car overheats while idleing fan not turning on ac not blowing


Check the Fan switch at the bottom of the radiator, if you disconnect it and have a power feed to the switch then it isn't a fuse.Bridge the terminals and if the fan comes on then the fault is probably the switch.

Jul 01, 2012 | 2000 Jeep Grand Cherokee

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Overheating I change waterpump, thermostat, flush radiator, change drivebelt, radiator cap radiator hose and it still overheat when i drive it on highway it dont overheat just driving in town it overheats


Two things you can check: First pull your oil dipstick and make sure that the oil is clear and not cloudy or milky, if it is you have a blown head gasket. Secondly if the vehicle has an electric fan make sure that it is coming on. You can do this by starting up the vehicle and letting it warm up for 10min or so or until the guage shows that it is hot. Then look under the hood to see if the fan is turning, you may have to watch it for a few min because they will cycle on and off. If the fan doesn't come on, that is why it overheats in town because it is not getting enough airflow across the radiator. If the fan does not come on you can start troubleshooting it by checking the fuses and relays in the dash and under the hood. If the relays and fuses are good and the fan still won't come on, with the key on and engine off, carefully wiggle the wire that goes into the fan, these sometimes make bad connections, but again be careful because if that is the issue the fan will begin spinning so watch your hands and fingers.

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My honda civic 1999 sir overheats when I turn on the air con.


If your car is getting Overheat when you turn the air conditioner On, it means that you need to repair your compressor or it will need to be replaced.

It could also be that if your car has a 2nd or separate radiator fan that should come on when the car is either hot OR when the A/C is on - perhaps it is NOT coming on and thus your car overheats. If your car does have a 2nd fan, check to see if it is coming on when you turn on your air conditioner.

Also, I would check that your radiator fan is on (even if it has only one electric fan) when the car temperature is getting near the HOT zone. At some point, the fan should come on to help circulate the air through the radiator vents and help cool the coolant (water) in the radiator.

In short, make sure your fan(s) are working okay. If not, that could be causing your car to overheat too.

Tell us news (remember rated this).

Jun 29, 2010 | 1997 Honda Civic

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Thermo valve broken, does this cause over heating?


if you mean "thermostat" valve .. then that can fail either open or closed . if it fails open then the engine will not reach normal operating temperatures .. if it fails closed then yes the engine will overheat .. another common failure is the radiator fan .. it only runs when the car is not moving .. as long as the car is moving then cooling air is available so the fan is not needed ... so if your car does not overheat when driven but overheats when stopped or idling then suspect the radiator fan or thermal switch (mounted on the radiator) .. that switch turns on the fan when the radiator gets so hot ... you can just listen for the fan when hot .. you should hear it .. .. if your car gets too hot while driving then suspect a bad thermostat or clogged radiator .. sometimes a bad water pump (broken implellers) will cause the trouble ..

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I went full tilt and replaced the radiator, water pump, thermostat, radiator cap and timing belt. I have 85,000 miles on the car and it was about time to do these things anyway. It is running like a new car now.

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