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Ray
Dodge Dakota
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6/08/2010
08:48:33
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 Subject: RE: 4.7 overheating
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I flushed out the system and all is well.
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Keith N
Dodge Dakota
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6/25/2010
20:19:07
| RE: 4.7 overheating
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Do yourself a favor...go down to NAPA and buy a $30 block test kit. Get the motor up to temp and it will take about one minute to determine if there is any combustion gas getting into the cooling system.
When you flushed the system, you likely got any bubbles out and you refilled to the proper capacity. A small leak somewhere will gradually push the coolant out the overflow. It takes very little coolant loss in these before the problem starts to occur again. When I was chasing the problem with mine, I could make it go away temporarily by refilling the coolant. A few days later it would start to reoccur.
Another sign is the temp varying with load. Drive up a short hill and the temp climbs...crest the top and it drops again. It won't change much but in perfect running order my temp gauge would never move even cresting mountain passes.
Good luck!
Keith
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Frank
Dodge Dakota
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7/10/2010
16:18:51
| RE: 4.7 overheating
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Four months ago I had my water pump, fan clutch, and new antifreeze in my Dakota 4.7...which since then I've been having the same over heating problem as you have above. Especially since we started camping, pulling my lightweight trailer up hills...and when I slow down it cools off. Will be going to Napa to inquire about the block test, any other suggestions?
Frank
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Shatto
Dodge Dakota
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7/10/2010
16:52:01
| RE: 4.7 overheating
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And just what year is your Dakota?? If you got an 05 and up this seems to be a bit too ordinary for that generation Dakota.
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Frank
Dodge Dakota
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7/10/2010
17:07:28
| RE: 4.7 overheating
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A 2001 Dakota with a newer motor - 2008 which was factory reconditioned.
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Keith N
Dodge Dakota
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7/10/2010
20:52:17
| RE: 4.7 overheating
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There can be a number of other things but checking for combustion gas can save you lots of time and money swapping out part after part. Anyone with a pulse can do it.
A small trailer shouldn't be a problem at all. I pulled an open car trailer with mine, a friend pulls a 16' boat over mountain passes reliably.
Temp fluctuations under load usually indicate a pressure loss somewhere. It could be a bad radiator cap. It could be a small leak in a hose. I replaced the hoses, cap, fan clutch, thermostat, water pump, coolant many times, temp senders...
Another sign was that the coolant level in the radiator would drop. Not much but it would drop, but the level in the overflow tank didn't drop so it wasn't siphoning the fluid back into the radiator. Radiator cap would be the normal answer but a 30psi cap didn't change it.
In the end, it turned out to be a leak in the head gasket. (2002 purchased in 2001)
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Bev
Dodge Dakota
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12/13/2010
15:05:04
| RE: 4.7 overheating
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I have a 2003 Dodge Dakota SLT. I have been having an overheating problem when going up hill or on hot days but not on cool days nor on flat straight aways. I had the radiator flushed and a new radiator cap put on. Also had the thermostat replaced. Still overheating. It has never gotten all the way over to the right nor has any lights come on in the dash. Just noticed that it gets to the line right before the H. What should I check next. Someone told me it might be the Cooling Fans or Relays???
Thanks.
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daddio
Dodge Dakota
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12/13/2010
21:29:28
| RE: 4.7 overheating
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Make sure the cooling fan is coming on as it should. 2 conditions for the electric fan to come on. 1) Demand for A/C and engine temp above 130 degF, 2) Engine temp at 210degF. If that checks out check the clutch for the mechanical fan.
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RaissiKitten
Dodge Dakota
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2/23/2011
23:57:16
| RE: 4.7 overheating
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Im not liking this at all..... Seems to me My beloved Dodge company DOES have an issue with coolant.. Guess what? I have an 03 Dodge Dakota 4.7.. Runs great, get it on the interstate and wham.. She starts heatin up!! Not overheating, But warmer.. Get off, and shes fine. Check my coolant and it seems EVERY week, its low.. The ONLY coolant loss I see, is coming out my overflow! I have replaced the antifreeze every 6 months, and Oil every 3,000 miles with synthetics.. (I do it to often, better to often than not often enough). Anyway.. Checked my Water pump, Perfect.. Radiator and cap are great. Replaced Thermostat.. I burped the line, and lost alot of air.. but then it quit and ran great on the interstate! Problem solved? No.. A week later, Im low again.. and its running warm on interstates.. Im going to do a leak down and pressure test my plugs tomorrow.. Theres no water in the oil, and the plugs were replaced two years ago, and when I pulled two off last month, they looked amazing.. sooo.. Guess were all in the same boat eh? Will let ya know what I figure out!
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02dak4x4
Dodge Dakota
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3/04/2011
12:20:24
| RE: 4.7 overheating
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I am willing to bet you have a head gasket leak or a cracked head. I never had overheating problems but I did seem to get a puff of white smoke on start up, replaced the head gaskets and rebuilt heads and all is well again. But a cracked head or a leak would allow coolant to drain into a cylinder a small amount at a time creating an air bubble leading to over heating. Check your exhaust for signs of coolant.
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Mike V
Dodge Dakota
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8/17/2011
23:21:04
|  RE: 4.7 overheating
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Hey guys i have an 01 dakota with similar problems. EVERY time i drive it colloant leaks out of the radiator resivoir cap ( plastic one) and it was running hot one day so i did the thermostat great for about a weak then bam i was sitting in a drive thru and it was 3/4 of the way on the thermostat i pulled over added coolant for piece of mind let it coll back down then it was fine for a few more days. then one day while driving it was running a LITTLE warmer than normal. a little over half and it would go back down then go back up. not sure if any one has a solution or why my coolant leaks out of my overflow and cap. PLEASE HELP!!!!!!
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daddio
Dodge Dakota
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8/19/2011
13:14:58
| RE: 4.7 overheating
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Message:
Make sure the cooling fan is coming on as it should. 2 conditions for the electric fan to come on. 1) Demand for A/C and engine temp above 130 degF, 2) Engine temp at 210degF. If that checks out check the clutch for the mechanical fan.
You could also try a new radiator cap. If it is not holding pressure you will overheat. When was the lst time the cooling system was maintained?
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RaissiKitten
Dodge Dakota
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8/30/2011
00:16:49
| RE: 4.7 overheating
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Just an update, My issue turned out to be a tiny pin hole inside the radiator.. It only let out air, causing pressure issues, and the fluid to go out the reservoir.. I replaced the radiator, and no longer have an issue.. Thank GOODNESS!
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Dehvyd
Dodge Dakota
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10/07/2011
17:50:52
| RE: 4.7 overheating
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I have a 2001 Dakota qc 4x4 w/4.7 that is leaking antifreeze
intermittently somewhere towards the rear of the engine on the
passenger side. I suspect a heater hose, but this area is so tight
that I can't see anything. I checked the passenger side carpet and it
is dry so I don't believe it is the heater core. Any suggestions?
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RaissiKitten
Dodge Dakota
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10/08/2011
15:39:08
| RE: 4.7 overheating
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My Bid Dodge done that once, only it poured out toward the back and turned out to be a Freeze Plug.. =\ Depending on location, THAT cheap little plug can be a SERIOUS pain in the.. yeah. Also, I thought my radiator replacement worked out, Guess what? Driving through the lake of the Ozarks, several months later.. My temp goes way up.. I am still loosing water, No leaks. No water in my oil, and None in my exhaust.. That I can see.. the leak is so small that Im not sure WHERE to begin.. Im going to do some tests I guess..
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Ted
Dodge Dakota
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10/16/2011
20:48:36
| RE: 4.7 overheating
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I have a similar issue with a 2003 durango 4.7L. The water pump went out about a year ago at just 60,000 miles. I replaced it and it wasn't long after that the upper hose/cap assembly started leaking so I replaced it with a new cap. Now periodically coolant will spew out the cap, but it is rare and may go a few months without happening. If I remove the bleeder screw there are a few very small bubbles that repeatedly pop up. I've put the block tester on about half a dozen times and the fluid has never changed to anything but blue with a slight green tint, which is a negative for combustion gasses according to the instructions. I've also put a pressure tester on the radiator. It will slowly lose pressure with the engine off. With the engine running, it will not go over about 8 even when revving it up.
Based on the bubbles and the occasional coolant spewing out the cap I really suspect a head gasket failure, but with the block test coming back negative and the pressure tester gauge not going up excessively while running I have to wonder if something else isn't going on. It does not seem to be losing any coolant except when it is obviously spewing out. I do frequently smell coolant in and around the engine bay but the level stays the same. I have never noticed the smell of coolant in the exhaust or any white smoke. Any advice?
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Ted
Dodge Dakota
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10/16/2011
20:55:46
| RE: 4.7 overheating
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Message:
I forgot to mention, this vehicle has NEVER overheated. The bubbles and spewing are the only issues.
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MJCAST
Dodge Dakota
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10/27/2011
15:39:52
|  RE: 4.7 overheating
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WE have a 2000 Dakota 4x4 that never gave any signs of overheating. Early Saturday morning, get a warning to check gages, look down and it's almost @ the red. I pulled of the highway safely and had it towed to repair shop. Mechanic said it was radiator so have to ok to replace. Later that day, going to store notice the gage going up and up. Went back to mechanic shop and he suggested for some test. 2 days later I'm told everything indicates cracked heads!! Is this possible. our truck only has about 150,000 miles. some help. If so, about how much does that cost to fix? Southern California area.
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Dale
Dodge Dakota
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7/14/2012
15:49:58
| RE: 4.7 overheating
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2003 Dodge Dakota with 4.7 liter engine. One year ago the truck overheated for the first time had about 85,000 miles on it. Towed to garage and had a new thermostat put in. Then a couple months later it overheated with fluid loss out the overflow. Garage could find no problems, did check of engine for anti freeze in oil, pressure tested system, checked cylinders no sign of fluid getting into the engine. Now every month or two it will overheat and be low on antifreeze, usually a half gallon or so. I've had clutch fan and new radiator cap installed and still having the problem. The garage is at a loss and feels it could be a possible cracked head or an imperfection in the head creating a small loss of anti-freeze overtime, but not enough to be found by testing the system. It also looks like the anti-freeze isn't siphoning back into the engine and that is why it overflows out the overflow hose. The garage feels with a cracked head it is creating too much pressure which in turn won't let the anti-freeze siphon back into the engine. The overheat generally happens at slow in town speeds or at an idle. When on the open road or even at an idle with rpm's around 2000 it will cool back off. Any suggestions ????
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Skipshot
Dodge Dakota
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8/27/2012
20:07:38
|  RE: 4.7 overheating
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Message:
This is driving me crazy... new upper hose...
new lower hose... new radiator cap... new
thermostat... and every 3 weeks even after all
of this... still adding coolant about a half a
gallon... no sign of leaks no sign of cracked
heads no coolant in oil... no oil in coolant...
water pump sounds perfect... no damage or
leaks at the radiator... this is absolutely
maddening!!!
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