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Kowalski
GenIII
11/01/2008
08:32:32
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 Subject: RE: 4.7 overheating
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Maybe the new radiator cap is bad ? As long as you are sure it is being lost from the reservoir - it has to get past the cap to get there.
Lead, follow, or get out of the way
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Eric in Jax
Dodge Dakota
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11/09/2008
21:18:51
| RE: 4.7 overheating
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I have a 2000 4.7 that was running hot, come to find out that the water pump impeller bearings failed and caused the impeller to rub a hole in the back of my timing cover. It filled the radiator with shavings and was over half way clogged. After replacing the radiator and a new timing cover, which dodge has for around $230.00 complete with water pump, thermostat and housing, everything is fine now, even the heater core which i replaced yesterday. Hope this is not the issue with anybody, but, gives another option on the probable cause.
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tmayes10
Dodge Dakota
JOIN HERE
11/20/2008
14:50:47
| RE: 4.7 overheating
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Another common problem with this style of cooling system, is getting air pockets in the system. By your radiator cap there should be a bleeder screw. You can bleed the system out that way. There is a special funnel that replaces your cap for temp use to refill these types and really helps getting all of the air out of the system. Its a radiator cap with a hole in the top and the funnel fits into the top. You just fill the funnel with antifreeze mix and keep it full while the vehicle runs. Good luck.
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greendak01
Dodge Dakota
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1/15/2009
13:08:53
| RE: 4.7 overheating
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my 4.7 got really hot one day and ran crappy..i am taking the heads off cause i know the gasket is bad cause i have water in the oil....is it a warped head too???
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Kowalski
GenIII
1/16/2009
16:44:00
| RE: 4.7 overheating
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If it didn't get water in the oil until after you ran it in the overheated condition, it is very possible that the water got by a warped head - rather than a bad gasket as you believe. Is that what happened ? You'll have to pull the head and check it with a straight edge to see if it is warped. Not uncommon, when someone pushes an overheated engine with aluminum heads for too long.
Lead, follow, or get out of the way
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greendak01
Dodge Dakota
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1/18/2009
19:07:19
| RE: 4.7 overheating
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yes the water didnt get into the oil until after it overheated....i have a feeling the head is warped too.. it ran but would just misfire in cylinder number 7....does this mean i only have to take one head off??
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a benson
Dodge Dakota
JOIN HERE
6/20/2009
23:46:26
| RE: 4.7 overheating
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my 2000 dodge dokata overheats going up a mountain under a load I've changed the thermostat the water pump and had the cooling system flushed and cleaned out and also changed the clutch fan It is still doing it. the only thing I haven't done is replace or had the radiator worked on Please help with any suggestions. Thanks
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Kowalski
GenIII
6/21/2009
06:47:01
| RE: 4.7 overheating
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The radiator could be checked with a heat sensor to see if there are areas of no or restricted flow that are reducing it's efficiency. If you've truly eliminated every other possibility, what is left must be the problem.
Lead, follow, or get out of the way
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daddio
Dodge Dakota
JOIN HERE
6/21/2009
09:37:23
| RE: 4.7 overheating
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Is the aux. electirc fan operating ass it should? It's supposed to come on with engine temp. above 210 deg.F or with demand for a/c and engine temp. above 130 deg.F.
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idahojoe
Dodge Dakota
JOIN HERE
7/01/2009
22:48:33
| RE: 4.7 overheating
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How would you go about bleeding the air without this special cap?
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Kowalski
GenIII
7/02/2009
09:32:08
| RE: 4.7 overheating
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Special cap ? I bleed mine by running the motor with the cap off . When it warms up enough to start circulating coolant smoothly, just put the cap on then. No special cap required.
Lead, follow, or get out of the way
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idahojoe
Dodge Dakota
JOIN HERE
7/02/2009
12:15:40
| RE: 4.7 overheating
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I was bleeding the air out the cap and it kept burbing air. I watched it for about a good five min and it never stopped. Can it be Exauhst?
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kid
Dodge Dakota
JOIN HERE
7/08/2009
00:37:04
| RE: 4.7 overheating
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do a leakdown test. google it
i love this misconception about faulty head gaskets.
the head gasket seals compression, water, and oil.
a mix of ANY of these could mean a faulty head gasket/warped head.
a fault between two cylinders would manifest its self as low compression between the two adjacent cylinders ( compressed air goes from one cylinder to the other resulting in rich burn/low power )
a fault between a cylinder and a coolant passage would manifest its self as air in the the coolant and/or the smell of burnt coolant in the exhaust and/or overheating ( on the compression stroke compressed air leaks into water passages and displaces coolant with air bubbles that "cling" to the inside of the block and head, causing inefficient cooling, soon these bubbles find there way up and out but the water level never goes down to replace what air came up and/or water will leak in to the cylinder and burn causing an odor unlike oil or fuel and eventually the coolant level will be noticeably lower with no external leaks and in extreme cases cause internal engine damage because H20 does not compress eg. a bent rod )
a fault between the cylinder and oil passages would manifest its self as fowled plugs and black exhaust smoke ( its burnt oil, google the negative effects of burning oil in your cylinder )
a fault between an oil passage and water manifest its self as milky oil and/or an oil sheen under the radiator cap ( obviously bad and is the "goto" for a blown head gasket witch is not the case 100% of the time )
and lets not forget that it is possible to have a fault between any three and the edge of the head causing leaks externally, although rare its more common with a warped head.
my main goal with this post is to show how much the head gasket really does and how much more complicated the proper diagnosis of a faulty head gasket is, what ever the reason or cause is.
do a leakdown test or get your mech. to do it. if he looks at you like you made it up, you should find a new mech. its very easy and gives a lot of info.
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Jack
Dodge Dakota
JOIN HERE
7/14/2009
21:04:32
| RE: 4.7 overheating
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i just changed the therm. in my 2001 4.7 dakota and it is still overheating....I also got a radiator flush too...now I'm in dallas its been 102-105 for the last few days...but i dont think my truck is still supposed to be overheating. could anyone out there give me some info..bcuz i am tired of spending money on this truck
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Grizzle
Dodge Dakota
JOIN HERE
7/21/2009
12:15:05
| RE: 4.7 overheating
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My 2004 4.7 Dakota one day started to over heat at an idle but stayed cool on the highway. I was afraid I already knew that it may be the head gasket or the head was warped.
Way back last fall when I did an oil change I noticed a little white film on the bottom of the oil cap. I knew this ment that coolant was mixing with my oil but I wiped it off and tried not believe my beloved Dakota would do such a thing. My last Dakota with a 3.9 ran 240,000 miles and never had any interior problems.
The next sign of problems to come was a check engine light. The diagnostic reading said #1 was misfiring. I quickly changed the plug and coil and went on my way. About two weeks later the over heating started. I drove about 20 miles on the highway and stop at DQ for a cone. While in line the temp went all the way up until the light came on. I quickly turn off the truck and let it cool down. On the way home the temp cooled back down. Once safely in the drive way I let it idle and again it heated up until the warning light came on.
I change the fan clutch and the thermo, check the fluid but still it heated up. I finally admited defeat and took it to the shop. Turns out I was right way back last fall and the heads were warped which probably started with a bad gasket.
Thank god I worked a extended warranty into the deal when I bought my truck. It covered the repairs and a loaner vehicle for a week. After my last Dakota was so dependable I never thought I would use the warranty but turns out it was the best thing I did when I bought my truck.
After researching the 4.7 Dakota I have found that this is a fairly common problem with these trucks. I'm a little scared to keep pilling on the miles if problems will continue to arise. I got 83,000 on her now not so sure she will make 240,000 like the last one.
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Rick Crawford
Dodge Dakota
JOIN HERE
7/29/2009
15:33:50
| RE: 4.7 overheating
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everyone on here need to do a co2 test on the cooling system, dodge is looking like the have a common problem here and its not seeming to be a gasket problem either , more like a cracked head/heads or block problem.. check it out and post what you find .. lets see if im right??
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Keith N
Dodge Dakota
JOIN HERE
8/04/2009
15:34:05
| RE: 4.7 overheating
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Before I get a leak down done, are there any other likely sources for air getting in the system?
I've had the same symptoms as many others, overheating at idle and especially when backing. New rad cap, thermostat, rad hoses, and clutch fan. I have a new rad and water pump ready to install this weekend. Leave it overnight and there's still pressure in the system.
When I try to bleed the air from the cap, it never completely stops bubbling but no noticable leaks and the coolant level doesn't drop as it runs for half an hour slowly bubbling. No visible sign of oil in the coolant or vise versa and other than the rising temp the truck seems to run fine. It will lose coolant over time, I'm guessing through the overflow, and doesn't seem to pull it back out of the resevoir. Top it up to the rim of the rad cap and it will run cool for a few days until it gets down about a quart or two of coolant.
Maybe I'm in denial but I'm hoping there could be another possibility than the head and/or gasket.
Thanks,
Keith
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Keith N
Dodge Dakota
JOIN HERE
8/13/2009
13:47:35
| RE: 4.7 overheating
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Although nobody replied, I bought a hydrocarbon test kit as opposed to doing a leak down test and did indeed find a very small leak. Small enough that a leak down test might not have readily shown bubbles and as opposed to a cooling system pressure test it won't fill the cylinders with glycol. FYI they're about $40-50, quick, easy, and non-invasive.
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anniewhite
Dodge Dakota
JOIN HERE
10/06/2009
08:24:40
| RE: 4.7 overheating
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I have a 2004 Dakota .... Dec had problems with oberheating. Dealer replaced hoses, thermostat, etc.. cost me ( not warrenty) 4000 miles later same thing,, checked and it was almost out of fluid.. added 1 gallon.. 4 days later added 30 ounces... that night terrible noise.. Fri am told me head gasket had blown
what happened,, it only has 18000 miles,, yes 18000 miles,, anyone else have same problems.
what should I replace.... should radiator be cleaned and new thermostat put on too besides head gasket stuff..
hopefully powertrain warrenty will cover it... I will pay 100 deductible.. ok, but very disappointing that truck is in so much trouble.
Also replaced steering column ( somthing) I forget the name of part, but replaced it TWICE in the last 2 years.. the strreing gets real tight like power steering fluid empty and hard to drive....
ideas ?? send to me at anniewhite@chilitech.net
thank you
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Ray
Dodge Dakota
JOIN HERE
6/07/2010
16:15:06
| RE: 4.7 overheating
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2001 4.7 overheating. Drove it 100 miles with the heat cranked up so the temp would lower and high temp light would go off. My first question here is would that have caused any damage running that many miles with the temp gauge above the halfway mark?
I've replace the belt and thermistat. Next I plan to drain and flush the radiator and replace the pump. Any suggestions?
Thanks,
Ray
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