No heat from heater?

YUP

MEMBER
3 POSTS

No sir. Why do u ask?

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Tuesday, December 1st, 2020 AT 9:58 AM (Merged)

JOHNNYT73

MECHANIC
924 POSTS

Whenever you drain coolant or open the cooling system. You create an air pocket(s) in the system. When the engine is cold, remove the cap, fill with coolant, start the truck and turn on the heat, let it idle till it reaches normal operating temperature, check coolant level, raise the rpm above 2500 a few times to help push the air out of the system. Do this till the upper and lower radiator hoses are hot and you have heat at idle. Be sure to keep an eye on the coolant level.

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Tuesday, December 1st, 2020 AT 9:58 AM (Merged)

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi:
It sounds like the thermostat is bad. You're right, the truck should run around 195 to 200 degrees. However, the way it is now, you should still get at least warm air from the heater.

Let me know if I helped, and if you have any other questions.
Joe

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Tuesday, December 1st, 2020 AT 9:58 AM (Merged)

SCOTT YANCEY

MEMBER
2 POSTS
1999 DODGE DAKOTA

Heater problem
1999 Dodge Dakota 6 cyl Two Wheel Drive Automatic

replaced thermostat and radiator cap. Started taking dash apart to get to controls. Need any suggestions. Will be looking at vaccume control to open door on heater core. For safety, I need to pull the fuses to the air bag system but they do not just pull out. Any suggestion?

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Tuesday, December 1st, 2020 AT 10:00 AM (Merged)

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Disconnect the battery for at least 30 minutes prior to working on it. As far as the heater core, with the engine running, hot, and the heater on, do both heater core hoses get hot?

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Tuesday, December 1st, 2020 AT 10:00 AM (Merged)

SCOTT YANCEY

MEMBER
2 POSTS

With engine up to temp, I could grab both hoses at the firewall to heater core barehanded and hold on to them. I thought they would be hotter than that. Did not think there was a difference in temp of the two hoses. There has been a flush kit installed when I had the system serviced in the past. I think the kit is installed on the wrong hose. It is on the hose going to the water pump from heater core. From the things I have read it should be on the other hose going from engine to heater core.

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Tuesday, December 1st, 2020 AT 10:00 AM (Merged)

MSPOPO

MEMBER
1 POST
1998 DODGE DAKOTA
6 CYL
2WD
AUTOMATIC
72,000 MILES

I get very little heat in cold weather (zero). Last winter I had no heat after buying used. The pump leaked so I put in nrw pump hoses, stat, and 2 flushes back flush. Still no heat, I the had a new heater core installed. Heat was better but not hot.
Last winter after repair temp was mid 20s or higher.
During the resent cold snap zero and lower in Chicago I am freezing after warming up engine for 20 min. While driving on road barley enough heat to keep windshield from frosting up. Blower works, coolant full, vents work where I select but air is luke warm. When it is 20 plus degs the heat is marginal. When its really cold I need heat to see out my windshield and warm up after working in these extreme temperatures. It seems after looking up problem many 3.9l have same problem. Temp gauge loooks to be around 160. I thought the stat in the system was 195 as the engine calls for. Can I fix it or just melt it in the furnace for scrap.

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Tuesday, December 1st, 2020 AT 10:01 AM (Merged)

2CARPRO JACK

MECHANIC
11,533 POSTS

You may need to block off part of your radiator to get the engine temp up. If it is running at 160, you wont get any heat in the cab. Is the blend door (hot-cold) under the dash working properly, may not be moving all of the way one direction so you are getting warm instead of hot

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Tuesday, December 1st, 2020 AT 10:01 AM (Merged)