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Overheats while idling--runs greatwhile under load

Runs good until i stop & in a few minutes it overheats & boils over from the overflow tank otherwise it runs great & has excellent heat in cab.I'm at a loss why it does this.

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  • Cars & Trucks Expert
  • 300 Answers

Is the belt good and tight,could be thermostat,or water pump on its way out.

Posted on Dec 25, 2013

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Posted on Jan 02, 2017

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SOURCE: Over heating/ loss of coolent

If you are not loosing coolant on the ground. You may have a problem of a bad intake manifold gasket or worst a bad head gasket. The two things to look at are coolant in your oil, manifold gasket. Coolant out the exhaust, head gasket.

Posted on Jul 05, 2008

motor1258
  • 6674 Answers

SOURCE: 99 DODGE STRATUS RADIATOR OVERFLOW BOTTLE

Double check that your rad cooling fan is operating as it should, but after that, I'd be looking at a good rad flush, or rad replace. Believe it or not, your heater core is like a small rad, and when you turn the heater on, it actually cools the circulating coolant, slighly,and therefore shows a difference on your gauge. Like I said, make sure the rad fan is coming on when engine temperature is at normal or slightly higher, and if it is, then I'd be taking a close look at my radiator, especially if it wasn't replaced when headgasket was done.

Posted on Aug 27, 2008

  • 139 Answers

SOURCE: loss of coolant

need to replace that cap

Posted on Apr 21, 2009

acoates
  • 454 Answers

SOURCE: my car runs good at idle but overheats when i get

Sounds like the head gasket is blown and pushing the coolant out of the radiator. Here is an article that will help you find out the real cause, though.
How to diagnose an overheating engine
Hope it helps!

Posted on Dec 27, 2010

  • 3 Answers

SOURCE: Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot

disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

Posted on May 08, 2012

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1 Answer

I may have added too much coolant. After adding it, I drove for about 15 minutes. A few hours later, the tempurature gauge light came on. I check the coolant level again and there was nothing in the...


No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

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