water pump failure and fuel economy is shot


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water pump failure and fuel economy is shot

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Guest
Anonymous Poster

Jun 7, 2008, 5:08 PM

Post #1 of 3 (2495 views)

water pump failure and fuel economy is shot	Sign In

99 dodge dakota V6
the truck keeps running hot and eventually overheating after 30+ minutes of driving. I have had the pump and thermostat replaced three times in the last couple of months. the last time they replaced the fan clutch as well and ever since the truck is a lot louder and has no take-off power for the first two or three gears. On top of that today I noticed that after driving maybe 10 minutes around town I burned through an eighth of a tank of gas after I had just filled it up. if anyone has any idea I'd appreciate the help.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 7, 2008, 6:38 PM

Post #2 of 3 (2491 views)

Re: water pump failure and fuel economy is shot	Sign In

What the deal with so many water pumps and thermostats???? WTF man!

The new fan clutch will give noticeable drag on engine to cool the radiator better and should be "thermostatic" such that it only works hard when warmer and near freewheels when airflow or ambients temps are enough.

If it's just a locked fan now to try to solve this overheating which is probably the radiator

then it will drag on the power a lot - a roar when rpms are up from a stop. If a NON thermostatic one was used it will waste gas also and pull more air then needed.

OE was thermostatic and just a new one after the years you would notice especially in warmer weather.

For the gas mileage you really have to take the miles and do the math with the gallons - full to full again. You really need to do that over a few times and average them all for a real assessment.

Seriouly, the vehicle's own gas gauge isn't that accurate - or none are that I know of that aren't telling you the exact gallons left in the tank. My own full size truck will take 5 more gallons from the first click at most gas stations and the gauge reads full either way and there's a five gallon difference if you don't force it full as can be. The speed you run the pump may click off sooner if fast too so it's just that you aren't as full each time.

Hey - we all hate the price of gas. Do keep track. The new fan clutch will actually use a bit more fuel but not overheating is imperitive so what do you do? Check that the fan spins when engine is off - it should but won't coast well. If you can - feel for the little spring in the front of it - it should have one if thermostatic. The cheap one won't and will roar away all the time. Check you reciept for a part # and see what one was installed . The cheaper one is a waste of gas and $$ real fast and I'd swap it out for exact OE one if not now,

T

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 7, 2008, 7:04 PM

Post #3 of 3 (2490 views)

Fan Clutches. Thermal and non thermal....	Sign In

These are generic pics of typical fan clutches. The one on the left is not thermal and will drag abundant air for radiator whether needed or not.

The thermal one on the right has a temp sensitive spring to make the clutch grab harder when air is still hot coming thru radiator. When cooler weather and driving a higher speeds the air of moving is frequently enough so air thru radiator isn't as warm and the clutch will react by NOT grabbing as hard or robbing power. You really notice it working in warmer weather - A/C on when stopped at a traffic light for example and heat builds up such that when you take off again it's working very hard to cool the engine as it should.

From new these work well for about 5 years IMO. When you replace them you will notice more busyness and fan pulling harder in warmer conditions which is normal.....

T

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