My heater is not working why?

Tiny
GARKEL34
  • MEMBER
  • 2001 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
My van is overheating very quick after starting and there is no heat. I have no coolant leaks and just replaced thermostat.
Sunday, December 12th, 2010 AT 7:29 PM

21 Replies

Tiny
HAHNY1
  • MEMBER
  • 75 POSTS
Have you checked your water pump. if its not working it will not circulate you coolant and might explain the no heat. also are the fans working? This guide can help us fix it

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.
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Sunday, December 12th, 2010 AT 7:56 PM
Tiny
GARKEL34
  • MEMBER
  • 2 POSTS
Checked both hoses going into firewall and both are hot, asuming water pump is good. It doesnt appear that the fans are working. How can I tell if its the actual fan or the relay? Will fans not working cause the no heat? I know it will cause it to overheat. Any suggestions? Any help would be great. Thanks so far.
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Sunday, December 12th, 2010 AT 9:04 PM
Tiny
HAHNY1
  • MEMBER
  • 75 POSTS
My fans quit working and it was a fuse under the hood but you can test them by unpluging them and running a fused wire to the battery and a ground. If it's not the fuse and the fans do work there is a relay also.I priced the relay out and it was around 75 bucks. This could explain the overheating if the fans aren't working. Mine made the check engine light come on though. As far as the not heating inside I would check fuses, does the fan blower motor work? Did it blow heat before you changed the thermostat.(Thinking maybe an air pocket) Another thing is maybe the heater core is plugged but since both hoses are warm I'm not sure, sorry I can't be of more help.
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Monday, December 13th, 2010 AT 12:41 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Make sure that you bled the system. Based on your discription, it sounds like you have an air block. With the engine cold, loosten the return heater core hose and start the engine. If there is air in the system, it should push out and coolant through.
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Tuesday, January 25th, 2011 AT 2:39 AM
Tiny
BREBER55
  • MEMBER
  • 1 POST
  • 2001 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 68,500 MILES
My van suddenly stoped blowing hot air yesterday. I tried filling up the ratiator with antifreeze and it is still blowing cold air. Can you tell me what might be causeing the problem.
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Monday, November 2nd, 2020 AT 8:18 AM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Lots of things can cause that. First get the vehicle warm and then feel the heater core hoses directly at the fire wall post back what you find:

is one hot and one warm?
One hot and one cold?
Both hot?
Neither hot?
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Monday, November 2nd, 2020 AT 8:19 AM (Merged)
Tiny
LMANDY38
  • MEMBER
  • 1 POST
  • 2001 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 111,000 MILES
My heater and ac recently stopped working. We went on a long rode trip and it did come on for alittle bit (ac) but then smoke came out of the vents so we turned off. It went back to not working at all. The horn also stopped working and when u hit the brake the air bag light comes on. I dont know if it has any revelance to it but it all started about the same time. Also the button to allow heat from the motor to come in will not work. When I turn it on it flashes then goes out. Do you have any idea of what the issue could be? No air comes out at all.
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Monday, November 2nd, 2020 AT 8:19 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
First, believe it or not, you need to have the computer scanned to identify why the HVAC lights are flashing. The smoke you mentioned can be a couple things. If it had a sweet smell, it may have been coolant from a leaking heater core. If it had an electrical smell, it could be wiring, the blower motor, blower motor resister, and the list goes on. As far as the other items, what you described sounds like a problem with a ground. Check for bad grounds under the dash as well as under the hood (body grounds).
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Monday, November 2nd, 2020 AT 8:19 AM (Merged)
Tiny
MO25
  • MEMBER
  • 1 POST
  • 2001 DODGE CARAVAN
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 107,000 MILES
Our Dodge Caravan has had a leak all day and there is virtually no heat coming out. It is very cold here but we let it warm up for at least 20 minutes at one point and it still was not hot. The engine is heating up fine and we haven't had any problem as far as it running. What could this be?
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Monday, November 2nd, 2020 AT 8:19 AM (Merged)
Tiny
CH112063
  • MECHANIC
  • 1,320 POSTS
Is it your anti-freeze that's leaking? Try to make sure there is fluid in the radiator after its cold, only. Its coolant circulates inside your interior and this is probably the reason for no heat, this is bad so try to have it checked for where its leaking, ok? Let me know if you find it or need advice, ok?
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Monday, November 2nd, 2020 AT 8:19 AM (Merged)
Tiny
BIGFOOT26
  • MEMBER
  • 3 POSTS
  • 2000 DODGE CARAVAN
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 199,017 MILES
Trying to find blend door actuators. I believe there is two. I have dual climate control so father in-law believes there should be two. The one on the driver side controls where the heat is coming from buy cannot find why passenger side has no heat and why nothing will blow from the vents.
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Monday, November 2nd, 2020 AT 8:25 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

There are separate actuators for each side. I attached a picture and the procedure for you to view.

https://www.2carpros.com/articles/replace-blend-door-motor

Roy

The air conditioning system can be equipped with either a standard, single blend-air door actuator, or it can be equipped with dual actuators. The dual system has separate blend-air controls. This allows for separate control of the driver's side air, and the passenger side air.

1. Remove the lower left side steering column cover.

ABS Control Module
imageOpen In New TabZoom/Print

2. Remove ABS control module.
3. Remove blend-air actuator connector.

Blend-Air Actuator
imageOpen In New TabZoom/Print

4. Remove blend-air actuator.

INSTALLATION
1. For installation, reverse the above procedures.
2. Perform the HVAC Control Calibration Diagnostic and Cool-down test. Repeating the test is necessary to clear the fault codes.
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+1
Monday, November 2nd, 2020 AT 8:26 AM (Merged)
Tiny
BALDYREDTX
  • MEMBER
  • 1 POST
  • 2000 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 144,000 MILES
The heater does not work on 2000 dodge grand caravan, the a/c works perfect. It's more like the temp slider/setting does not work. The blower is good.
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Start by checking the thermostat, heater control valve, heater core and air blend door-
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
WARWICK1
  • MEMBER
  • 3 POSTS
  • 2000 DODGE CARAVAN
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
My van had heat in it till a couple of days ago. Top hose was hot and lowwer was cool. I changed the t-stat added coolent. I let it run for 20 min. And still no heat nothen at all. I do hear a squealing from the belts is it possible that the water pump has gone bad on it.
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Hi:
Is the engine overheating?

Joe
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
WARWICK1
  • MEMBER
  • 3 POSTS
No
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Hi:
If it's not overheating, the pump should be fine. You may need a new belt or one is loose. As far as the heater, it the t-stat is new and the controls are working, I think I would start with flushing the heater core. It may be plugged. Are both heater core hoses getting hot when the heater is on? If only one is hot, coolant isn't circulating.

Let me know if this helps.

Joe
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
WARWICK1
  • MEMBER
  • 3 POSTS
Thank you very much. This info helps alot.
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Monday, November 2nd, 2020 AT 8:27 AM (Merged)
Tiny
FXBRO1
  • MEMBER
  • 1 POST
  • 2000 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 134,000 MILES
I get heat blowing while on heat setting but when the defrosters are on it blows cold. Could it be some kind of vacume problem?
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Monday, November 2nd, 2020 AT 8:28 AM (Merged)

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