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Old January 15th, 2010, 11:16 AM   #1
fatboy21
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95 Dakota 318 not warming up

I just replaced the thermostat and rad cap still not warming up. After all day driving this is as hot as it will get



I took a reading at the collent in rad and it only gets to 183* and the thermostat is a 195. I don't get it. Any thoughts?
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Old January 15th, 2010, 11:19 AM   #2
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Possible clog. How's the water pump? Did you mix coolants?
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Old January 15th, 2010, 11:30 AM   #3
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Didn't mix coolants that I know of all green. Wouldn't it make it run hot if water pump was bad? and where should I look for the clog?
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Old January 15th, 2010, 11:33 AM   #4
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Possibly the heater core. Try flushing it.
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Old January 15th, 2010, 11:44 AM   #5
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low compression maybe? Pull a sprk plug and check color, maybe compression test? How many miles? Better worst or same after swaping the tstat? Do you get good heat from the heater?

Last edited by Freak; January 15th, 2010 at 11:48 AM.
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Old January 15th, 2010, 11:45 AM   #6
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Flush out the heater core. Also, I've gone through several autozone t-stats before I got a good one before..... You may want to return it and grab another.
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Old January 15th, 2010, 11:46 AM   #7
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Just had a bad thermostat from autozone that lasted 3 months.
Saftey fail = failed open and then never heated up.
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Old January 15th, 2010, 11:52 AM   #8
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Don't shop at autozone. I only buy stant thermostats I don't think its the heater core cause I still get descent heat out of it just the truck takes for ever to heat up too. Normally a 15 minute idle will warm up a motor, well mine wont even be off the cold bar after that long. Also I did a flush on it last summer didn't change anything.
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Old January 15th, 2010, 11:53 AM   #9
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Also my friend has the same truck and his heats up fine
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Old January 15th, 2010, 12:03 PM   #10
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Was there no heat and you changed it and there still is no heat?
Thermostat houseings leak all the time, maybe low fluid or bad stat. $20 diagnostic fix could ensure that was not the problem.
I have done dozens of them on dodge V8's and cleaniing the intake is extreamly important or they will leak in less then 6 months.
If that does not fix it then maybe there is low circulation and change the water pump.
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Old January 15th, 2010, 12:08 PM   #11
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Quote:
Originally Posted by JeepInABox View Post
Was there no heat and you changed it and there still is no heat?
Thermostat houseings leak all the time, maybe low fluid or bad stat. $20 diagnostic fix could ensure that was not the problem.
I have done dozens of them on dodge V8's and cleaniing the intake is extreamly important or they will leak in less then 6 months.
If that does not fix it then maybe there is low circulation and change the water pump.
There is no leak. I said in first post I changed the stat. sence the day I got the truck it has only warmed up that amount. After new stat it still only goes up to 183. There has alwas been heat just not very good heat. My friends truck blows hot and gauge goes closer to center(warmer) and warms up faster then mine.
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Old January 15th, 2010, 12:15 PM   #12
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There may be a valve that's not opening all the way depending on how the newer ones are set up. (I had a '93) Some of the dodges out there have it and some don't. Some type of vacum operated bypas valve for the heater lines.
As far as the temp, just go with a higher temp T-stat. You should be able to get then in 5 degree incriments from 180 up to 215. That can make a HUGE difference in how the heat feels in the cab.
As for the temp gauge, I think I ran a 180- had minnimal heat in the coldest of winter, but it ran nice and cool in the summer when wheeling the snot out of it.
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Old January 15th, 2010, 12:19 PM   #13
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I'm afraid to put a big stat in it its already at 195 if I go higher I'm afraid it will over heat in the summer
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Old January 15th, 2010, 12:20 PM   #14
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I've had the same problem since I bought my 97 Dakota... 3 motors in it now 5 water pumps, 3 different thermostats... Please let me know if you find an answer

Oh mine is the 3.9 L tho
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Old January 15th, 2010, 12:25 PM   #15
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Is the clutch fan staying engaged all the time?
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Old January 15th, 2010, 12:28 PM   #16
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Warm it up without the cap on and see if you can see it flow in the radiator when "warmed up".

Other possible issue could be a bad mechanical fan clutch always on.
With the engine cold will the fan spin some what freely? or is it dragging or stuck?

dam my slow editing (BAD93SBLZR )
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Old January 15th, 2010, 06:16 PM   #17
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Fan clutch was replaced bigining of last summer. It is working fine cause when you drive the truck cold you can hear it spinning then it will "loosen" up and the loud fan noise will go away. I wish I didn't get rid of my electric fan or I'd hook that up and see if it makes a diffrence
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Old January 15th, 2010, 06:40 PM   #18
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It's probably your gague itself or the sensor for the gague, I don't see anyway that the engine could be too well cooled....
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Old January 20th, 2010, 03:35 PM   #19
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I had a 99 dakota that had a problem overheating. I had the thermostat down to a 165. Turned out the radiator was bad. Put a new radiator in, and a 195 degree thermostat. After that, the thing never went above the cold line on the gauge. Read the water temp in it a few times, and it ran at 163 constantly, even in the summer. In the winter, I would put some cardboard over part of the radiator to get it to warm up a bit.

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Old January 21st, 2010, 10:41 AM   #20
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Do you have heat out of the hvac?
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