Question about 1991 Dodge Caravan

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Over heating intermittent, minimal water/coolant loss

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Sounds as if the thermostat is stuck closed at times. I would change the thermostat to start.

Posted on May 07, 2015

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Is the thermostat opening at 195 degrees ?
Does the radiator fan come on at 220 degrees ?
Can you tell if the water pump is moving coolant thru the system after the thermostat opens ? Are both radiator hoses hot ?

Posted on Jan 23, 2013

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Posted on Jan 02, 2017

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1 Answer

1998 nissan maxima problem water in the oil


If there is water in the oil, it wouldn't last long under the heat/pressure of the engine, so if you are seeing water it must be super fresh. Are you losing coolant? If so, then i'd suspect water pump/water pump gasket if you never had that replaced. It could be head gasket, but you would probably experience a consistent coolant loss with maybe loss of power or misfiring. You can check with a pressure/leak down test for head gasket. Either way, if you are losing coolant I'd check water pump. If you aren't losing coolant than it can't be the water pump or head gasket really letting "water" in.

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Jan 10, 2014 | 1992 Cadillac DeVille

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AUDI A3 2.0FSI 2004 water in oil with no or very little coolant loss


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I change the water pump, thermostat, and radiator but its still over heating


I assume that there are no leaks anywhere and the radiator cap is in good condition. A bad radiator cap wil be indicated by the coolant being heard to boil just after the engine is stopped because of the retained heat in the engine when there is no coolant circulation. Ensure all the hoses and clamps where they connect to the various pipes in the engine bay and fix/replace any that are suspect. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old, allowing coolant loss. Those spring type hose clamps tend to be less effective in clamping as the hoses become hard. Worm drive ones are the best to use.

If there are no leaks and water pump and thermostat are working correctly, but undetected loss of coolant once the engine heats up, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry and warping the head) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap. If the head gasket leak is bad enough it will allow coolant into the combustion chambers which will produce white steamy smoke in the exhaust and allow coolant to get into the sump while the engine is stopped. This is indicated by a white oil and water emulsion on the dipstick.

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1 Answer

1999 Taurus, no heat. Not good with winter coming.


If the coolant is full and the thermostat is bringing the temperature of the engine up to par than I would bet with 95% certainty that the heater core is plugged.

You can try back flushing it. You'll need a pair of pliers, a drain bucket, a piece of heater hose the same diameter as the heater hoses (about 3/4"), and a couple of needle nose vice grips. Pinch off both of the heater hoses at least 6 inches or more from where the attach to the heater core with the needle nose vice grips. This will minimize coolant loss from the engine. Put a drain bucket under the car to catch any coolant that runs out (by the way this is going to make a huge mess). Remove the clamps and heater hoses from the heater core. install the short piece of 3/4 inch heater hose onto a garden hose. Install the other end on one of the heater core tubes. Using low water pressure flush the heater core. You should see a lot of nasty stuff come out. Repeat on the other heater core tube. Continue this process until the water runs clear.

Reinstall the heater hoses, remove needle nose vice grips, Top off the coolant in the radiator, start the vehicle and let idle. Continue to monitor the coolant level and add as necessary. You should start to get some heat with the blower setting at low. If the heat goes away at higher settings than you'll need to repeat the procedure described above. Sometimes driving for a couple of days will help loosen up the debris in the heater core.

Also if the coolant is really dirty that it will help too have the cooling system flushed as well to prevent the debris in the coolant from settling in the heater core after you have flushed the heater core.

There is always the possibility of the heater core leaking after an attempt to flush is made. Using low water pressure will help minimize this.

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1 Answer

When the temp is over 90 outside, air conditioner will only cool for short time, then will start to blow hot air and overheat. I have replaced the thermostat twice, water pump, radiator, sensor, and...


Any coolant loss is significant in any car. Having replaced all those components leaves only the gasket or head as possible suspects.The gasket can fail in an area that does not allow oil to mix with the coolant and the same applies to possible cracks in the heads or warping. Have the system pressure tested to see if it has leaks.

Jun 21, 2010 | 2002 Lincoln Continental

1 Answer

This is in conection with my previous question. how many kilometers, anyway, would a water reserve empties or reaches its minimal level? thank you very much!


The coolant system is a closed system. When the system is full the reservior acts as an expansion container. When the engine heats the coolant expands. The coolant expands into the reservior when the pressure cap releases. As the engine cools the coolant contracts and the radiator cap allows the coolant to flow back into the engine. If you are having coolant loss it should show as an external leak If there is no external leak it could be possible to have an internal leak. In theory this system should not lose anything but coolant loss on a small basis is expected. If your coolant loss is great and it is not seen externally I suggest that a pressure test involving engine components be done. I hope this can help Moe

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2 Answers

1966 Ford Mustang overheating


try to run the water pump without hoses, and add water in the 'in' side, if is powers out the other side, then it's fine. how is your water/coolant mix?

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