A question for mechanics. (No heat)

[Dunerdr]

Alright, I’ll start off by saying this isn’t my every day driver, but a truck I’ve owned since 2013. It’s got 273k miles on it. I really just use it for bad weather, riding four wheelers and lumber yard trips.

Last year it stopped blowing hot air. Not uncommon. I changed an actuator and replaced a blendoor. Still no go. Paid a friend who’s a dodge tech at the local dealership to replace the heater core on the side, after flushing and cleaning the it without success. After 3-4 weeks of good heat it stops working again. I’m somewhat mechanically inclined and figure maybe some trash didn’t get flushed. Warranty the core at orielly and slip my friend a few bucks to do it aft hours again. He does a full flush this time, all new coolant, we don’t use the dealerships recovery machine. Heats working it’s all back on the up and up.

My brother in law borrowed the truck from January until may. Today I realized I once again don’t have heat. What’s my next strip? A radiator? Is the water pump coming apart (100k miles on it roughly)? The radiator isn’t plugged I don’t think..

[Otter]

Originally Posted by Dunerdr

Alright, I’ll start off by saying this isn’t my every day driver, but a truck I’ve owned since 2013. It’s got 273k miles on it. I really just use it for bad weather, riding four wheelers and lumber yard trips.

Last year it stopped blowing hot air. Not uncommon. I changed an actuator and replaced a blendoor. Still no go. Paid a friend who’s a dodge tech at the local dealership to replace the heater core on the side, after flushing and cleaning the it without success. After 3-4 weeks of good heat it stops working again. I’m somewhat mechanically inclined and figure maybe some trash didn’t get flushed. Warranty the core at orielly and slip my friend a few bucks to do it aft hours again. He does a full flush this time, all new coolant, we don’t use the dealerships recovery machine. Heats working it’s all back on the up and up.

My brother in law borrowed the truck from January until may. Today I realized I once again don’t have heat. What’s my next strip? A radiator? Is the water pump coming apart (100k miles on it roughly)? The radiator isn’t plugged I don’t think..

Thermostat? Cost about $4 and easy to replace.

[Dunerdr]

Originally Posted by Otter

Thermostat? Cost about $4 and easy to replace.

Did it with the initial flush and clr. Forgot to include that. And it gets up to temp normally and you can see it opening and closing on the temp gauge.

[LiveSteam]

What year and what model?
Is the fan motor running when it's switched to the on position?
If not check the heater motor relay and fuse.
Outside air to cabin air is controlled by vacuum. Older vac lines get brittle with age and break.
With just this bit of info. And all you've done. Sounds like the blower motor isn't blowing.
Dealership mechanic. Bwaaahahahaha. Opps. Technician

[Dunerdr]

Originally Posted by LiveSteam

What year and what model?
Is the fan motor running when it's switched to the on position?
If not check the heater motor relay and fuse.
Outside air to cabin air is controlled by vacuum. Older vac lines get brittle with age and break.
With just this bit of info. And all you've done. Sounds like the blower motor isn't blowing.
Dealership mechanic. Bwaaahahahaha. Opps. Technician

Motor blows, ac worked fine all summer, new outside/recirc door and motor as well as actuators just because two of them require the dash to be pulled to replace so I did them while it was apart. It’s an 09 half ton with a hemi.

[LiveSteam]

Originally Posted by Dunerdr

Motor blows, ac worked fine all summer, new outside/recirc door and motor as well as actuators just because two of them require the dash to be pulled to replace so I did them while it was apart. It’s an 09 half ton with a hemi.

You've replaced everything. You're 100% sure blend doors are working properly?

Weak water pump. Nothing else it can be.
I had to replace the 2002 camry pump for the same reason 10 years ago. Started blow ice cold air sitting at idle at red lights

[Eleazar]

Sounds like you gotta problem with your Johnson rod

[Buehler445]

Can you get to the actuator and make sure it’s working? Might be the controller in the dash.

That’s a good one. It’s pretty perplexing

[C-Mac]

If both heater core hoses(in and out) are hot, it’s almost got to be a blend door type actuator.

[Boise_Chief]

Originally Posted by C-Mac

If both heater core hoses(in and out) are hot, it’s almost got to be a blend door type actuator.

This all this. If the hoses are hot it's a blend door

[Dunerdr]

Originally Posted by HemiEd

I knew it was a Dodge before he said it was by the problem and it is probably a 2002 to 2006 3rd Gen Ram.

Lots and lots of posts and pictures on the 3rd Gen Ram forums about this problem and don't look forward to having it on my 03 but it only has 75k.

Wish I could help you but maybe someone on this forum can. https://www.facebook.com/groups/412676882514772

https://www.facebook.com/photo?fbid=...45887182527064

https://www.facebook.com/photo/?fbid...45742449208204

It’s an 09.

[Dunerdr]

Originally Posted by Boise_Chief

This all this. If the hoses are hot it's a blend door

New doors on both blendoors the directional one and the outside air/recirculate door. All of them worked and were calibrated at the dealership. You can hear them open/close. I’m going to get my dads snap on snake camera and put it in the vents to verify tomorrow but I’m leaning weak water pump, even though it was fine all summer.

[LiveSteam]

Originally Posted by Dunerdr

New doors on both blendoors the directional one and the outside air/recirculate door. All of them worked and were calibrated at the dealership. You can hear them open/close. I’m going to get my dads snap on snake camera and put it in the vents to verify tomorrow but I’m leaning weak water pump, even though it was fine all summer.

Sucks you ended paying God only knows how much through the process of elimination to get to a weak pump.
Dnt feel bad. Just how it goes sometimes.
I got to tell this story, about Bugeaters wife's car.
Bugs a dam good mechanic, we've been turning wrenches on cars since we were 15 years old.
So his wife's electirc car seat will only go back about a 3rd of the way. He spent months trying to figure it out, even sent it to the dealership to be fixed. They couldn't fix it either.
So one day Bugs decides to do a nice detailed cleaning job on the car. As he's vacuuming around under the seat. He finds a frigging Quarter stuck in the track of the car seat. Pulls the Quarter out of the track. And its fixed like new.