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LESchwartz
Dodge Dakota
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3/11/2005
11:48:14
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 Subject: 89 Dak -- No Heat!
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I have an '89 Dak 4x4 w/V6 and no heat. Since I'm in Minnesota this has become "old" as the winter has gone on (I don't drive it very often).
The cooling system doesn't leak, the hoses and 195 degree 'stat are new, and the coolent is full. But the engine just never seems to get warm: only cold air from the heater outlet, the temperature guage never gets to operating temperture, and the engine seems cool when I open the hood.
Any ideas?
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N56629
Dodge Dakota
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3/11/2005
13:29:24
|  RE: 89 Dak -- No Heat!
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I would say that the thermostat is stuck open. That's the only thing that would allow the entire engine to remain that cold.
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LESchwartz
Dodge Dakota
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3/11/2005
14:07:59
|  RE: 89 Dak -- No Heat!
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That's what I first thought, but the 'stat was replaced in December w/o any noticable effect on the problem. But it leads me to wonder out load how often thermostats are bad "out-of-the-box" . . . ?
Larry
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vern
Dodge Dakota
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3/11/2005
15:17:11
| RE: 89 Dak -- No Heat!
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after the truck has been run 15-20 min does the heater hoses got warm/hot?
if the heater core is plugged they may not got hot,one might,the other might not
try reversing the two heater hoses on the firewall,the heater core may be plugged this will back flush it and got you some heat,
if this works or helps,when its warmer out flush your cooling system
good luck
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LESchwartz
Dodge Dakota
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3/11/2005
16:29:57
| RE: 89 Dak -- No Heat!
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Heater hosed get warm, but not much . . .
But you've got me thinking -- the vehicle does have 200K on it. It could be that I've got crud floating around inside the cooling system, partially pulging the core and maybe the 'stat to stick open. On a warm day, I'll try a flush and fill and another new 'stat.
Larry
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vern
Dodge Dakota
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3/11/2005
18:45:14
| RE: 89 Dak -- No Heat!
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if there not getting hot thats a sign the heater core is plugged,
reverse the hoses first,i don,t think its the stat,
could save you some money and time,
i,ve done this on several older trucks/cars works well
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LESchwartz
Dodge Dakota
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3/11/2005
19:30:20
| RE: 89 Dak -- No Heat!
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I agree that reversing the hoses is an easy thing to try, I'll give it a whirl. However, because the engine never seems to get to operating temperature, I think there could be other problems in addition to the core ('stat, ???).
Larry
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vern
Dodge Dakota
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3/12/2005
07:47:43
| RE: 89 Dak -- No Heat!
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if the gauge is not getting up where it should be,it may be the temp sensor not working right
just a thought
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Dan M
Dodge Dakota
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3/12/2005
10:45:18
| RE: 89 Dak -- No Heat!
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I have a similar problem on my '95. for the last week, in the mornings, no matter what setting I have the temp controls on (ac could be on), it blows only cold air. In the afternoons it blows only hot air (ac may be on). It has a new t-stat and heater core. the t-stat was replaced because it was bad and the heater core because it was leaking ( found during pressure check of the coolant system after replacing the t-stat). I also have new t-stat housing and upper and lower hoses. Prior to this week, it sometimes ran cold or hot, it was not always cold in the morning and hot in the afternoons.
- Dan M
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olscout
Dodge Dakota
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3/12/2005
12:43:17
| RE: 89 Dak -- No Heat!
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I think I'd pass on reversing the heater hoses. All that will do if the core is plugged is result in the crud going into your engine, causing problems there, and eventually lodging back in the heater core. Since you are about 4/5 of the way there by having to pull both hoses anyway, just go ahead and flush the core and be done with it. A tip from a friend of mine (use it at your own risk, it works well for him at the shop he works at and it worked for me) is to pull the heater hoses, blow out the core as much as you can (just using your breath on one of the hoses is enough) and pour original 'The Works' toilet bowl cleaner into one of the hoses to where it gets into the heater core, fill it pretty much up. You should see foam and bubbles coming out of the hoses- that's 'The Works' attacking the lime and rust buildup in the heater core. Leave it in about four or five minutes, then REVERSE flush it with water from a garden hose. In other words, use the garden hose on the outlet hose of the heater core, and you'll be shocked at how much crud comes out. Repeat the treatment with 'The Works' a couple more times, reverse flushing each time, then reconnect your hoses and refill with coolant. You should see a marked difference in the amount of water flow if you try to flush it before using The Works, and after you use it. On my wife's 92 Caddy, it restored it from 'freeze your butt off' in cold weather to 'turn the heater down!'.
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