Heat

[bigbrat]

I've done a Rad flush..heater core flush..new thermostat and antifreeze.
I have heat in the cab sometimes and sometimes I don't.. and when I have heat it isn't super hot..
Would a bad water pump cause this..I've tryed everything

 

[mtnrider]

Clogged heater core. If flushing didn't work your probably going to need to replace it.


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[Burla]

Try RMI25 and cheap checking overflow for junk. You are like one year past ground zero for casting sand, but it is very likely you have it. Rim-25 non corrosive non toxic detergent that benefits the entire cooling system.

 

[bigbrat]

Clogged heater core. If flushing didn't work your probably going to need to replace it.


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So when I flushed my heater core..it was a steady stream of water coming out the heater core hoses..I flushed in both directions and had lots of water coming out..do you still think it would be clogged?

 

[bigbrat]

Try RMI25 and cheap checking overflow for junk. You are like one year past ground zero for casting sand, but it is very likely you have it. Rim-25 non corrosive non toxic detergent that benefits the entire cooling system.

Do I have to drain my antifreeze and add it with just water or can I just put it in my rad with the antifreeze?

 

[Burla]

Do I have to drain my antifreeze and add it with just water or can I just put it in my rad with the antifreeze?

just add it to over flow tank

 

[bigbrat]

just add it to over flow tank

Can i add it right in the rad?

 

[Burla]

if you like sure

It's just easier the other way most of the time, thanks to temperature fluid is constantly being added and taken from tank.

 

[mtofell]

So when I flushed my heater core..it was a steady stream of water coming out the heater core hoses..I flushed in both directions and had lots of water coming out..do you still think it would be clogged?

Did you hit it with air and water? House water pressure is a lot higher than your cooling systems runs at so what may look good while flushing doesn't work well in use. I got a combo air/water gun on Amazon for $20 and it worked great. From talking to others and researching it seems the air is key to dislodge things.

 

[Flip-er]

I have heat really good on pasenger side and lil on drivers, BUT sometimes its reall good on both, I do NOT have duel zones either

 

[mtofell]

I have heat really good on pasenger side and lil on drivers, BUT sometimes its reall good on both, I do NOT have duel zones either

Textbook clogged heater core.... flush it out! You probably have pieces of crud in there bouncing around causing intermittent clogs. I'm no mechanic and it took me a couple hours and <$50 in parts. Lots of threads around here on it lately.

 

[Randy Grant]

Blend doors???

 

[Gwerner74]

Textbook clogged heater core.... flush it out! You probably have pieces of crud in there bouncing around causing intermittent clogs. I'm no mechanic and it took me a couple hours and <$50 in parts. Lots of threads around here on it lately.

Yeah, this sounds like a chunk of something getting stuck at different spots as it works its way through the heater core, especially since he doesn't have dual zone heating which in my mind eliminates blend doors as the culprit.

 

[Gwerner74]

Blend doors???

For the original poster it does sound like it could be a blend door issue with all of the other repairs already done. Probably need more info to really tell.

 

[mtnrider]

So when I flushed my heater core..it was a steady stream of water coming out the heater core hoses..I flushed in both directions and had lots of water coming out..do you still think it would be clogged?

100% clogged heater core. Enough water gets around the clogeed area that it will pass through no problem and also both hoses will still be hot but you will have no heat.

.

 

[bigbrat]

100% clogged heater core. Enough water gets around the clogeed area that it will pass through no problem and also both hoses will still be hot but you will have no heat.

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I've ordered a bottle of RMI-25 to try that..we can't buy it in Canada so ill have it next week

 

[Chevy4240]

I've done a Rad flush..heater core flush..new thermostat and antifreeze.
I have heat in the cab sometimes and sometimes I don't.. and when I have heat it isn't super hot..
Would a bad water pump cause this..I've tryed everything

I flushed my heater core with CLR and used a small circulating pump hooked to heater core and bucket , ran it with CLR for 40 min and wow lots of fine material came out .. then flushed straight water through till all CLR out and now all is good lots of heat and even both sides of cab..

 

[Chevy4240]

I've ordered a bottle of RMI-25 to try that..we can't buy it in Canada so ill have it next week

CLR works great try it ...

 

[Dusty]

In the old days we'd use a water/air pressure (20psi max) technique to flush cooling systems. Even after a chemical treatment that method flushed out a lot of stuff sometimes.

Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 142099 miles.

 

[Gwerner74]

I flushed my heater core with CLR and used a small circulating pump hooked to heater core and bucket , ran it with CLR for 40 min and wow lots of fine material came out .. then flushed straight water through till all CLR out and now all is good lots of heat and even both sides of cab..

That's the same method I used. After getting the coolant out I ran a few gallons of water through it. Then I used the circulating pump to run fresh water through it for about an hour. After that I switched over to a gallon of water and two 28 ounce bottles of CLR and let the pump circulate it for another hour. Flushed all of that out and blew some low pressure air through to dry things up. Time consuming job but totally worth it because I now have great heat in the cab.