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1999 Dodge durango Heating issue


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huston_fam
New User

Nov 15, 2017, 7:05 AM

Post #1 of 8 (182 views)
1999 Dodge durango Heating issue Sign In

I have a 1999 Dodge Durango that we just pulled a 318 out of and put in a 360. Running good, the only issue I have now is that the heater is not blowing hot. The heater core inlet hose is hot but the outlet is cool. I installed a new radiator with the motor swap and I have flushed the heater core out good. When flushing I alternated the water in hose from inlet to outlet several times and used a chemical flush as well. Good out from both directions. I primed the heater core with coolant before reconnecting the hoses, still no heat.


Couple of Thought:
1) Can the heater blend door be stuck open pulling outside air (40s here now) be a cause?
2) Has anyone re-routed the outlet hose to the hose going into the thermostat and plugged the line coming from the water pump?
3) Any other suggestions?

Thank you
Shawn


Hammer Time
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Nov 15, 2017, 8:12 AM

Post #2 of 8 (171 views)
Re: 1999 Dodge durango Heating issue Sign In

If both hoses are not hot, then you can't blame the blend door. You still have a restricted heater core it appears.



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Tom Greenleaf
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Nov 15, 2017, 10:16 AM

Post #3 of 8 (160 views)
Re: 1999 Dodge durango Heating issue Sign In

Agree - possible restricted core fins but can allow flow OR the cooler hose returning has exchanged a lot of heat where did it go - like wrong action of the blend doors.
Tricky to me as I wouldn't expect good flow from flushing then the cool line? It should be warm as "water/coolant" doesn't give up all it's heat so fast but should be less not cold.


The other maybe is water pump can't cut it fins corroded or some problem that the coolant really isn't flowing up to par. You did change out engines make sure it's all hooked up as intended too,


T



huston_fam
New User

Nov 17, 2017, 7:32 AM

Post #4 of 8 (125 views)
Re: 1999 Dodge durango Heating issue Sign In

When I took off the heater core inlet hose there is just a trickle coming out of it while running.?


(This post was edited by huston_fam on Nov 17, 2017, 7:33 AM)


Discretesignals
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Nov 17, 2017, 9:14 AM

Post #5 of 8 (106 views)
Re: 1999 Dodge durango Heating issue Sign In

Does this thing run hot? Upper and lower radiator hoses hot? If you are positive that all the air was purged out, could have a flow issue. Did you use a new water pump?





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Tom Greenleaf
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Nov 17, 2017, 9:42 AM

Post #6 of 8 (96 views)
Re: 1999 Dodge durango Heating issue Sign In

Quote from top ">I have a 1999 Dodge Durango that we just pulled a 318 out of and put in a 360. <"
You tell me/us - did this just swap and ALL sensors and whole engine water pump and all matched up? Yes it's or was the same block engine IDK if identical for cooling system or water pump itself just what you got but it shouldn't be just trickling with inlet hose off if the water pump is worth crap AND is in coolant not air.


If a whole used engine fits and all matches up to do that (not sure?) and runs where did this go wrong? Is there a restrictor in the output hose to the heater or flow goes thru anything from pump?
New hoses I would think? Is it possible to have them backwards? Sorry all questions but trucks in particular just can't know some silly stuff that could be all different despite a cast iron block that looks the same is it close enough otherwise and good enough if whole? That's all. If you have the old one sitting there be nice to compare specifically water pump itself IMO possible differences or wiped out impeller came with the replacement if used?


T



huston_fam
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Nov 17, 2017, 10:59 AM

Post #7 of 8 (84 views)
Re: 1999 Dodge durango Heating issue Sign In

Does this thing run hot? Upper and lower radiator hoses hot? If you are positive that all the air was purged out, could have a flow issue. Did you use a new water pump?
It doesn’t run hot, both Rad hoses get warm. Did not use a new water pump. Thinking about replacing it though.
If a whole used engine fits and all matches up to do that (not sure?) and runs where did this go wrong? Is there a restrictor in the output hose to the heater or flow goes thru anything from pump?
New hoses I would think? Is it possible to have them backwards? Sorry all questions but trucks in particular just can't know some silly stuff that could be all different despite a cast iron block that looks the same is it close enough otherwise and good enough if whole? That's all. If you have the old one sitting there be nice to compare specifically water pump itself IMO possible differences or wiped out impeller came with the replacement if used?
There is not a restrictor in the hose, it was a whole motor swap, everything fit. I pulled the hose from the water pump and the hose next to the thermostat and when running no water/coolant comes from either one.


Discretesignals
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Nov 17, 2017, 3:02 PM

Post #8 of 8 (76 views)
Re: 1999 Dodge durango Heating issue Sign In

I believe you may be able to remove the lower radiator hose from the pump and see up inside the pump housing to inspect the impeller.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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