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BobR
Dodge Dakota
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7/10/2002
10:07:04
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 Subject: RE: Dakota Heater Problem
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I have a 94 3.9 2wd. Had to change the water pump last summer. I had no heat all winter, tried several t-stats and checked flow through heater core. Went back to auto parts and purchased what they called a new water pump, other one was remanufactured. I found that the rebuilt had an impeller with straight fins. The new one has curved fins. What a difference. Always make sure your impeller matches original.
Good luck.
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Rich
Dodge Dakota
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7/11/2002
09:36:11
|  RE: Dakota Heater Problem
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Impeller? I replaced my waterpump and this could be the problem. does your truck run hotter then normal.what was the price difference in the waterpumps.
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MikeW
Dodge Dakota
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7/11/2002
18:52:55
|  RE: Dakota Heater Problem
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It is always a good idea to compare the impeller when replacing the water pump (new or rebuilt). Often the same pump is designed to rotate either clockwise or counterclockwise. Depending on the application, the pully system may turn in one direction or another with the only difference being the direction of the impeller. If you get the wrong impeller then your water flow is backwards!
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John Jordan
Dodge Dakota
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11/04/2002
23:12:25
| RE: Dakota Heater Problem
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On my 200 quad it is a little different. Every time I turn the heater on I get cold air from the passenger side floor vent especially while highway driving. It is as though the speed is forcing moreair into the system . Anyone experience this problem. Does anyone have an idea where I can lok for a picture or schematic of the heater system. Thanks John
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Dan
Dodge Dakota
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11/19/2002
00:27:02
| Fix to original question
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Here is an answer to the original question about the posters heater core. It is plugged. I had the same exact problem. I had flushed out my coolant system several times, but still no real heat coming from the heater. I then finally thought about it and realized the the convential way of flushing out a coolant system does not really flush out the heater core. The problem is that when you flush the coolant system out you normally connect the flushing water to the inlet side of the heater core hose and then backflush the system out through the radiator cap. This works fine for the engine and the radiator, but does not backflush the heater core. But for less than 99 cents and about 15 minutes you can easily backflush your heater core yourself. There was a suggestion on an earlier post to just reverse your inlet and outlet hose on the heater core and that would backflush it. This is true, but the gunk that is clogging up the heater core will just get flushed into you engine and will probably end up right back in your heater core. What you have to do is get a 5/8 inch female garden hose adapter. This can be purchased at just about any hardware store. Make sure it is the kind that slips inside the garden hose. Then with the engine cool you need to disconnect the outlet hose of the heater core from the engine. You need to do this at the water pump connection, which should be on the driver's side of the engine. Then insert the garden hose adapter into the end of the hose. Then disconnect the heater core inlet hose from the engine connection. On my Dakota this is easily done at the splice that is on the passengers side of the engine. This splice is where you normally connect to flush out the coolant system. Then hook a garden hose up to the outlet hose and turn on the water. Have someone help you turn on and off the water as you flush out the heater core. Try and collect atleast the first 2 gallons of stuff you flush out and dispose of this according to your local laws. After the first 2 gallons all you should get out of your heater core is dirty water. This should be ok to just dump on the ground but make sure first. You will probably have to flush the core for a good 5 minutes to fully clean it out. Then reconnect your heater hoses as they were and enjoy the heat.
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2mtech
Dodge Dakota
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1/02/2003
10:21:56
| RE: Dakota Heater Problem
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Had exactly the problem described here on my '95 3.9 Dak: very little heat and only on low fan, blew cold on high, took forever to heat up. Followed Dan's reverse flush procedure, couldn't believe the amount of brown sludgy crap that came out! Heater works great now...thanks!!
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azdakota
Dodge Dakota
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1/03/2003
01:30:40
| RE: Dakota Heater Problem
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thanks Dan, just like you said... one question: top outlet from heater core goes to engine, bottom outlet to water pump. I got interupted lol
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Mac
Dodge Dakota
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1/04/2003
22:22:23
|  RE: Dakota Heater Problem
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I had the exact same problem with a '96 Dakota I just bought. (Blew warm with fan off or low, cold at med or high.) Tried Dan's fix and it worked like a charm! Thanks a bunch!
And yes -- top outlet from heater core goes to engine, bottom outlet to water pump -- at least on my '96 3.9 liter.
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ed
Dodge Dakota
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1/13/2003
15:52:46
| RE: Dakota Heater Problem
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Message:
Does anyone have a fix to the original question. Blower blows fine!!! Temp is normal. When truck is not moving cold air is coming from the vents. As truck moves the hot air starts to blow out. Stop the truck cold air starts to blow again. I start my truck in the a.m. to warm up, after 10 minutes temp is up but blows cold air until I start driving.
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myamin
Dodge Dakota
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1/16/2003
19:59:44
| RE: Dakota Heater Problem
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Message:
I had the same problem of cold air on high
blower setting and lukewarm on lower
settings. I followed Dan's recommendation
and it's much much better now. Thanks Dan!
mohmd.
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Brent
Dodge Dakota
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1/17/2003
09:56:27
| RE: Dakota Heater Problem
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Message:
Dan you RULE!!!! I was having the same heating problem as many others on this site, lukewarm only when the engine was off idle and cold at idle. I followed your procedure and now have MUCH heat. Thank you very much for taking the time to detail the procedure so the rest of us could could fix our problem in only five minutes.
Thanks again!!!!
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Dan
Dodge Dakota
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1/18/2003
18:12:09
| RE: Dakota Heater Problem
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Message:
I am glad that I have helped several people out here with the heater core problem. I only wish that I had figured it out sooner. I spent a year and a half without heat before I figured it out.
Dan
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azdakota
Dodge Dakota
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1/18/2003
21:15:07
| RE: Dakota Heater Problem
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Dan, now solve and post a simple fix for the fuel gauge issue!
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Dan
Dodge Dakota
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1/18/2003
22:38:20
| RE: Dakota Heater Problem
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Message:
To Ed:
I would think that your problem may be a partially plugged heater core. As your engine is idling your rpm's are low and your water pump is not creating as much pressure in your engine, but when you are traveling down the road your engine is turning at higher rpm's and is producing more pressure. This increased pressure would possibly be able to move some coolant through a plugged heater core. Give the backflush a try. It only takes a few minutes and does not cost much to try.
Dan
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Hoagie
Dodge Dakota
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1/21/2003
19:45:30
| RE: Dakota Heater Problem
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Hey Dan,
I just wanted to let you know, it's 25 degrees here in Louisville and the forecast for tomorrow night is is around 5 degrees.I just finished the heater core backflush exactly the way you explained and now I have heat! Thanks alot. No doubt you've saved me and a whole bunch of other guys a chunk of cash.Thanks again.
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Jim
Dodge Dakota
JOIN HERE
1/22/2003
09:21:24
|  THANKS DAN!!!! AWSOME!!!
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Your Trick worked like a charm.
THe splice in the line makes this procedure so easy. I just hope that dodge dealers don't know this trick, or they will be making a ton of money telling people that they are getting new heater cores. I din't have that much sludge come out, but the heat is two times as strong now.
THANKS AGAIN DAN!!!!!!!!
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frankp93dakot
Dodge Dakota
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1/23/2003
16:32:54
|  RE: Dakota Heater Problem
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ok, flushed heater core, new thermostat. Flushing caused it to leak! OK, so new heater core is in. Now truck still wont blow hot air?? I've heard check the hose for the vents? and some other valve somewhere??
I am gonna squeeze the radiator hose to remove bublles
Any ideas would be a big help in what the problem still is!
Thanks
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cbmoose
Dodge Dakota
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1/26/2003
18:54:47
| RE: Dakota Heater Problem
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Dakota Dan, you're the man! My '93 had good heat the first year I owned it, then it dropped off last winter, and finally this winter the heater wasn't! Replacing the radiator cap helped some, but the frigid temps we've had lately simply overpowered the heater. So, this morning, I took your advice, and went out and backflushed the heater core directly into the driveway, in a nice, brisk 24 degree morning! I refilled the system before everything froze, and was rewarded with nice, 150 degree air from the vents! Back when I was younger, I used to install a Prestone Flush-n-Fill kit on everything I drove. I got away from that philosophy, and as a result I darn near froze! If you install a kit, do it in the line that goes from the pump to the heater. Then, just clamp the heater hose between the fill connector and the pump to force the water back through the heater, through the engine, and into the bottom of the radiator, and down the drain. Thank you, thank you, thank you!
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dougger
Dodge Dakota
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1/27/2003
13:10:45
| RE: Dakota Heater Problem
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Message:
Just add another fix to your list Dan!! Worked great and I called the Dodge Dealership where they have worked on this problem at least 5 times with no fix, told them what I did and I got the response, "There is no way that could have fixed your heat problem, there must have been an air lock somewhere." Well from what they have told the last 5 times I have had it in there for this problem, they changed the thermo, flushed the system, drained the system, replaced hoses, ran a pressure test. Anyway, they did not believe that could fix it. I believe it, actually I am going to do it again this weekend, I did not run water through the system for more than a minute or so. I have alot of heat but I think there is still something holding back, when at idle it really cools down, then push on the gas it is really hot, so do it again and I will be fine, I hope Thanks again Dan!
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Dave in RI
Dodge Dakota
JOIN HERE
1/29/2003
16:42:24
| RE: Dakota Heater Problem
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Message:
Thanks Dan,
Was just going to replace my thermostat for the described trickle heat on my 97 Dakota with 160,000 miles. Been getting worse every year and I decided today was the day to try and fix it. Glad I checked this site first. Followed your tip on the reverse flush of the core, and now the heat pours out like it should. Like you said, got some real nasty looking stuff out of it.
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White and Red
Dodge Dakota
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1/31/2003
20:54:56
| RE: Dakota Heater Problem
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Message:
Thank You Dan,
Just finished flushing the heater core on my 1989 Dakota today after work. The difference is unbelievable, nothing but hot air, just the way I like it when it is -40F with the wind chill.
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Billi01
Dodge Dakota
JOIN HERE
2/13/2003
11:26:59
| RE: Dakota Heater Problem
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Message:
I Have the same problem with my 96 3.9, i will try the reverse flush, have another problem though.
Its with my a/c in summer, when i turn it on it overeheats the engine. any advice will be greatly appr.
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Rick
Dodge Dakota
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2/26/2003
12:53:04
| Timing gears and chain
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I was just wondering if anyone might have a schematic on the timing chain and gear replacement on a 1990 Dakota with a 3.9 V-6. If not maybe someone can inform me what my problem may be? The engine has a load knock and I was told the timing gears need to be replaced along with the chain. I was also told that the distributor may need to be replaced. I hope someone out there has come across the same problem.
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Billi01
Dodge Dakota
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2/26/2003
17:10:42
| RE: Dakota Heater Problem
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Message:
If you are reading this Dan THANK YOU
that did the trick.
Thanks Again Dan.
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TURK
Dodge Dakota
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7/01/2003
14:32:28
|  RE: Dakota Heater Problem
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Message:
MY HEATER DOES THE SAME THING AND MY A/C DIES IT ALSO WHEN FAN IS ON LOW HOT OR COLD AIR DEPENDING ON THE SETTING HEAT OR A/C AS SOON AS YOU KICJK THE BLOWER UP ON EITHER SIDE HOT OR COLD IT WARMS UP A/C AIR OR COOLS DOWN HEAT AIR I HAVE CHECK ALL INTERNAL VAC DEVICES ALL WORK
HELP ME PLEASE THANKS
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