Best Answer

intermitances are hard to diagnoise as you have a hard time checking while they are actime up. Aboiut the only thing a water pump will do to make it overheat is leak. The thermostat could be sticking but that is rare that it does it intermittently. I would suspect cooling fans not operating properly.

If it is a water pump problem then usually the temperature will go up when the engine is idling and it will go down when the engine is reving. If you don't have a water temp guage you may not be able to detect this. If you are unsure of which of the two, then replace the thermostat first as it is the cheaper part. See if that fixes the problem. If it doesn't then you will have to replace the water pump.

Thanks to everyone who answered my question. Ultimately, the thermostat switch for the fan was the culprit. I did not know at the time that it was only overheating after a long idle time. Fortunately, I didn't spend the money for a pump before I decided to take the van to a mechanic.


Check to see if both cooling fans are funtioning!!!!

User Avatar

Wiki User

โˆ™ 2015-07-16 19:17:34
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: How would you know if a bad thermostat or a bad water pump was causing a 1996 Dodge Grand Caravan to overheat intermittently?
Write your answer...

Related Questions

Can the timing belt on your Camry be causing it to overheat?

No, but faulty water pump or thermostat can.

What happens when thermostat does not open?

en the thermostat doesn't open it cant let the fluids flow into your engine causing it to overheat.

What could be causing your 200 BMW 528i to overheat?

There are a few things that could be causing your 200 BMW 528i to overheat. You may not have the correct mixture of coolant in the vehicle. The problem could also be your thermostat. Have the thermostat checked out to ensure that it is working as it should.

Will a bad thermostat cause a car to lose acceleration?

By itself, the thermostat would have to be stuck closed causing a severe overheat condition to cause a loss of power.

What is causing a 97 Geo Prizm to overheat when the fluid level in the radiator is full?

You could have a stuck thermostat or your cooling fans aren't working.

Why does the engine warning light come on in your vauxhall astra with a simultaneous increase in engine temperature followed by a steep drop?

It sounds like the thermostat is opening up late causing the engine to almost overheat before it opens. Replace the thermostat.

What could be causing your 96 dodge neon to overheat?

could be fans not working, thermostat, blown head gasket, broken or leaking coolant lines, bad heater core

When you Replaced the thermostat in 98 deville with a 4.6 and it still overheats any suggestions?

theyre maybe an air bubble in the block causing it to overheat,or it could also be a bad water pump

What is causing my Vauxhall Corsa to overheat?

Could be headgasket

Why is oil getting in antifreeze of your 87 b2000 causing thermostat to stickand engine overheat?

Oil/antifreeze mix is usually caused by head gasket leaks or valve cover gasket leaks.

What is causing your car to leak antifreeze and overheat?

Without make model year & engine size.... Head gasket, waterpump, hoses, radiator, cooling fans not coming on belt to waterpump, thermostat, etc...

What could cause a 1997 Isuzu rodeo to run hot?

first , the thermostat could be stuck. try replacing it. if your radiator OS losing coolant, there may be a leak in the radiator causing it to overheat, or the water pump could be bad. thermostat is the likely cause if it is not losing water.

How would you know if a water pump was causing a Kubota tractor to overheat with no thermostat?

If you are unsure if it is heating because of a water pump or a thermstat, you can find out by removing the thermostat. If it still heats without a thermostat, then you know it is the water pump. Without a thermostat, the water flow has nothing to cause it to heat unless the water pump fails to circulate the water. No circulation of the water would cause the over heating.

Why would a 1998 Chrysler town and country heater blow cold?

You might check the thermostat. It probably needs replaced. Often times the thermostat will either be stuck in the closed position, causing it to overheat, or in the wide open position causing the heater to blow cold. This is what happened to me. I took the thermostat out and the end was broken off. This made the spring release and be stuck in the wide open position. We were driving over a snowy pass at around 10 pm. NOT a fun trip.

What is causing your car to overheat run the fan after being turned off smoke and the air conditioning to go out?

Low coolantPlugged or restricted radiatorBad thermostatBad water pumpDefective radiator capSystem airbound

Your kia Rio overheats and blows out cold air you changed the thermostat But still have the problem?

You have not bleed the air out of the system after you installed the t-stat, causing the heater not to work and the engine to overheat. Use a coolant filler that screws into the radiator and get the air out

Will a thermostat cause the car to overheat?

Thermostats determine when antifreeze enters the main cooling system. If the thermostat isn't working correctly, the antifreeze could enter the engine to late, (or not at all) resulting in an over heating engine. Another problem of having antifreeze enter the engine late, is that if your engine is very hot, possibly a little warmer than common, when the antifreeze enters the engine, the cold fluid could cause the engine block to cool down quickly, causing a cracked engine block.

Does the PS3 slim get hot fast?

It has a cooler causing it to never overheat as many have said.

98 Ford f150 how can you tell if water pump is bad not leaking but have no heat Could this be the problem?

Check the thermostat first - if it is not opening (stuck), coolant will not flow through the engine block and, therefore, will not flow thorugh the heater core. In any case, if the water pump or thermostat is faulty, the engine could overheat causing serious damage.

What could be causing a car to overheat when driving but not while sitting idle The radiator cap and thermostat have all been replaced and you have no known system leaks But you still have a problem?

Clogged radiator, bad water pump, defective fan or fan thermal relay.

What causes overheating?

one of the things that could be casing your ovreheating problem is a stuck thermostat. The thermostat stays closed until the engine gets to a certaqin temperature and then opens up to cool the engine. if the thermostat fails to open no coolent gets to the engine therfore causing the engine to overheat. one way to tell if your thermostat is going out is your upper radiator hose where the themostat housing is will be stretched and feel kinda rubbery. hope this helps could also be that your water pump is going and or a broken water pump belt...but id go with the thermostat first.then take it from there.

Why would one of your belts keep breaking and the car overheat?

water pump may be locking up, causing belt to break and vehicle to overheat. have a good mechanic look it over.

What would cause an 1989 Firebird to overheat?

A lot of things could be causing that. First did you check your coolant?

What could be causing a 1989 Pontiac sunbird gt to overheat?

many possibilities; low coolant, bad thermostat, radiator fan does not work, bad relays/fuses, leakage in coolant system, stopped up coolant system, bad radiator cap, blown head gasket.

What is the results when a thermostat is stuck in closed position?

If your thermosat is stuck shut your vehicle could over heat and you will probably loose heat in the passenger area meaning you defrost will not blow heat. If it sticks shut, it will block the circulation of coolant between the engine and radiator causing the engine to overheat.