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Heater not working properly?

Tiny
GRADY PAYNE
  • MEMBER
  • 2005 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • 2WD
  • 193,000 MILES
I have replaced filled fluids, flushed heater coil, and I still do not have heat. What do I do next?
Tuesday, January 2nd, 2018 AT 1:59 PM

30 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like a temperature blend door actuator has let go. Here is a guide to help you see what you are in for when changing it and the diagrams below to show you how ti will be on your car

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

and

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

Check out the diagrams (Below)

Please get back to us.

Cheers, Ken
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Wednesday, January 3rd, 2018 AT 8:17 PM
Tiny
WAYNO123
  • MEMBER
  • 5 POSTS
  • 2005 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • AUTOMATIC
  • 120,000 MILES
No heat when outside temperatures are really cold. When the engine warms up I do get heat if I really step on the gas. Sometimes when I let my foot off it goes back to cold air. I changed thermostat and coolant. No help.
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+4
Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The two small hoses going into the heater core at the firewall when the engine is at operating temp. Are they both getting too hot to hold?If one is but the other isn't the flow in the heater core is restricted. Do you know if coolant stop leak has ever been used in the radiator?
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
WAYNO123
  • MEMBER
  • 5 POSTS
Both hoses are hot. Stop leak never used. Thanks. Im leaning toward the water pump.
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-1
Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Are both getting too hot to hold?The water pump is a Kong shot if the pump wasn't circulating enough coolant I would think you would be having overheating issues.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
JOHNNY G.JR
  • MECHANIC
  • 320 POSTS
Has cooling system been back flushed since new? Not drained and refilled.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
WAYNO123
  • MEMBER
  • 5 POSTS
Not flushed. Only drained and refilled. Temp not going all the way up now. Only halfway. I thought that was due to the ice cold temps outside but not that its warmed up a little outside, engine temp not going up to normal. Ugh!
Thanks for your help
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Maybe you got a bad new thermostat
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
WAYNO123
  • MEMBER
  • 5 POSTS
It's happened before on another car. Thanks for all your help. Happy New Year.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
JOHNNY G.JR
  • MECHANIC
  • 320 POSTS
Thermostat has my vote also
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
That's to check if a thermostat isn't opening sounds like the thermostat is allowing flow when it shouldn't. Like a bad seal or partially stuck open.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
JOHNNY G.JR
  • MECHANIC
  • 320 POSTS
Keep us posted here at 2carpros, one more thing is cooling fan cycling properly
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
WAYNO123
  • MEMBER
  • 5 POSTS
Yes! I got heat. Tons of heat. Faulty thermostat I got at AutoZone. Picked up a new Stant thermostat today.I need this old van to haul my gear for ice fishing. Got bait.I'll be on lake tomorrow. Thanks for everything.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Glad to hear it I always get the start thermostat when I buy them. Let me know how the fishing goes tomorrow.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
ESTHER
  • MEMBER
  • 1 POST
  • 2005 DODGE CARAVAN
  • 14,900 MILES
Why would there be no heat? - Thanks for your help
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
It could be a couple things. First, with the engine hot and the heat on, feel both heater core hoses. Both should be hot. If only one is hot, flush the heater core. If both are hot, check the blend door. Chances are it is stuck.
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-1
Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
SIGN BOY
  • MEMBER
  • 4 POSTS
Hi, I realize this is an old question, but I have a similar problem. What is the next step if both hoses for the heater core are cold? The hose from the radiator to the manifold is hot.
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Monday, November 2nd, 2020 AT 7:55 AM (Merged)
Tiny
DRIVEINON
  • MEMBER
  • 2 POSTS
  • 2005 DODGE CARAVAN
  • 6 CYL
  • AUTOMATIC
As I was driving home my heater started blowing cold air and the temp gauge started climbing. There was a really bad smell
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Monday, November 2nd, 2020 AT 7:56 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Those are all indications of a leak in the cooling system. Have you looked for a leak?
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Monday, November 2nd, 2020 AT 7:56 AM (Merged)
Tiny
DRIVEINON
  • MEMBER
  • 2 POSTS
I have not, I will in the morning
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Monday, November 2nd, 2020 AT 7:56 AM (Merged)

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