Engine Overheating

Tiny
KRISTI_M_NEAL
  • 2002 DODGE CARAVAN

Engine Cooling problem 6 cyl Two Wheel Drive Automatic 99046 miles

My car out of the blue started overheating. I had the thermostat replaced. It is not overheating as quickly now. However it does still overheat when I am driving, but when I sit in park the gauge goes down slightly. I know nothing about cars so can you please tell me what you think it might be.

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Sunday, November 9th, 2008 AT 2:10 PM

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Tiny
2CARPROS KEN
  • ADMIN
  • 8,569 POSTS

Hello,

When the car is over heating can you hear the cooling fan on? If not please follow this guide to get them fixed.

https://www.2carpros.com/articles/replace-electric-fan-motor

If the fans are running please follow this guide

https://www.2carpros.com/articles/engine-overheating-or-running-hot

it also could be a blown head gasket which is common on those cars.

https://www.2carpros.com/articles/head-gasket-blown-test

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken

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Friday, May 26th, 2017 AT 6:50 PM
Tiny
MACTANK72
  • 2002 DODGE CARAVAN

Engine Cooling problem
2002 Dodge Caravan 6 cyl Front Wheel Drive Automatic 134550 miles

My Dodge Caravan is overheating. I have replaced the thermostat with an OEM thermostat. I have replaced the radiator cap(OEM). I haev flushed the system. I replaced the water pump about a year ago. The upper radiator hose is hot when the engine is running and is stiff but the radiator cap is ice cold. The heater is also blowing out only cold air.
Aside from replacing the radiator and water pump again I think I've tried everything. Please help!

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
JACK42
  • MEMBER

When warmed up are both hoses warm/hot? What about the heater hoses are they both hot? Does it overheat at idle or when moving or both?

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
DIJON9622
  • 2002 DODGE CARAVAN

Heater problem
2002 Dodge Caravan 6 cyl

While driving down the highway the temp light came on and the enginge got very hot. I put the heater on and the car did not overheat. After driving for a few more minutes to get off the highway the temp light went off and the temp gauge went to normal and stayed there until I returned home. This has happened a few times now. The heater does not work very well. What could the problem be?

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
  • 20,803 POSTS

You need to check your coolant level in the radiator and pressure test the system if it's low, which it likely is. Don't put this off as it's very easy to do serious engine damage with heat.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
LEGITIMATE007
  • EXPERT
  • 5,215 POSTS

Agree with wrench teck

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
BRITTNEY NICHOLE
  • 2005 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • AUTOMATIC
  • 23,000 MILES

I bought the van back in Oct 2016 drove it about two weeks then it started over heating. Fixed it then a few weeks later it did it again I parked it until three days ago we changed the water pump and alternator brought it home from my neighbors yard and it started over heating again. Changed the radiator in it today because we found it was cracked, it did well took it on a small ride to the gas station and store came home and it started over heating again. What else could it be? I have spent all of my money trying to make this thing work right and it still is not.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,393 POSTS

The first thing to check is if the radiator fan is turning on when the engine gets hot. The fan is not needed at higher speeds when natural air flow is sufficient. At what speeds does the overheating occur?

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
BRITTNEY NICHOLE
  • MEMBER

I knew I forgot to put something in there. We also changed the fans it is a duel fan. I apologize. It starts to over heat when I am stopped or almost stopped.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,393 POSTS

Follow the upper radiator hose to the engine. Right in that area will be a two-wire coolant temperature sensor. Unplug that while the ignition switch is on. The engine does not have to be running. The fan should turn on when that sensor is unplugged. If it does, that system is working and we have to look somewhere else.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
BRITTNEY NICHOLE
  • MEMBER

How would you know if the head gaskets are bad? Where would you find the engine coolant if the heads or gaskets are bad?

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,393 POSTS

I did not go there first because your engine does not have a history of leaking head gaskets. (I have one in my daily driver 1994 Grand Voyager, and my 1993 Dynasty). Dead fans are the better suspect.

If a head gasket is leaking, you will be be losing coolant. There is a quick chemical test that can be performed at the radiator, with the engine running. Air is drawn through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow.

You can also add a small bottle of dark purple dye to the coolant, then check a day or two later with a black light. The dye will show up as a bright yellow stain that you can follow back to the source. If a head gasket is leaking, you will find the dye inside the tail pipe. Auto parts stores will have the dye, and those that rent or borrow tools should have a black light.

Remember, the cooling fans are not needed at higher speeds. If the overheating only occurs at low speeds or when stopped, it's more likely to be a fan issue.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
JASONY
  • 2000 DODGE CARAVAN

Engine Cooling problem
2000 Dodge Caravan 6 cyl Front Wheel Drive Automatic

Van will be running fine, then blam - overheats. Doesn't seem to matter if A/C is on or not. Cool weather right now - so it's not that. Thought is was low on coolant, so I filled it up. It took probably 1/2 gallon. I always squeeze the lower radiator hose for air bubbles. Next day - same problem. Runs for maybe an hour or so and whamo. Going up hill does seem to make it worse. Only takes about 1/2 gallon of coolant again. Water pump was replaced last year. Serpentine belt okay. Don't notice any drips or leaks. But every time I check the coolant level after it overheats - it's about 1/2 gallon low. Maybe a plugged heater core? It seems like this van has been susceptible to overheating fairly easy for some time.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

Hi jasony, Welcome to 2carpros and TY for the donation.

Check and test the thermostat if okay, check the radiator if its clogged and water pump circulating coolant both okay could be airlock in the system try bleeding it don't work -Get it block and pressure tested.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
BRITTNEY NICHOLE
  • MEMBER

I replaced the fans could I still have problems with it?

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,393 POSTS

Absolutely. Feel the old fans to see if one is hard to spin. A motor with tight bearings will draw high current and blow a fuse. That would be fuse 27, a 40-amp under the hood.

I will be back tomorrow to see how you are doing. My typing fingers have frozen into little Popsicles!

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
BRITTNEY NICHOLE
  • MEMBER

Would you recommend putting stop leak in my van? I have a leak and I am seeing it come out of my exhaust.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,393 POSTS

Don't waste your money on those "mechanics-in-a-can". If a head gasket is leaking, chemicals aren't going to stop that. The coolant level will be dropping in the reservoir. Be aware one of the byproducts of a properly-working catalytic converter is water vapor. It is normal to see water dripping from the tail pipe and the drain hole at the back of the muffler.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
BRITTNEY NICHOLE
  • MEMBER

We found the problem I have a bad gasket. We are goingvtp replace them all. Thanks for all your help.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,393 POSTS

Is that a bad head gasket? Keep me posted on your progress.

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Friday, May 26th, 2017 AT 6:51 PM (Merged)

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