Heater not getting hot
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Elder User
Joined: Jun 2015
Posts: 664
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From: York Pa.
Heater not getting hot
I did already ask some questions on another members thread but felt like I was hijacking his thread so here's the deal. My blower works but the actuators were sticking and with meangreen"s lead I thought and was hoping that was the problem but no it wasn't . I drove the truck and after it came up to operating temperature and was still blowing cold air I opened the hood and felt the two hoses that go into the heater box. They were both hot to the touch all the way to where you plug them into the heater box, this is where the outer hose felt cold. I'm thinking there must be a blockage somewhere inside the box. Question, what should I do?
Fleet Mechanic
Joined: Dec 2007
Posts: 1,505
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From: Wildwood Pa
Tell us more about your truck. Mainly, AC or no AC? If AC, is it the factory or dealer installed style?
Did the heat stop working all of a sudden, or has it been getting progressively worse?
Did the heat stop working all of a sudden, or has it been getting progressively worse?
Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
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From: York Pa.
It is not a A/C combo, it's just only a heater. It has never worked since I have owned the truck but I don't generally drive it when it's cold outside. I am considering selling my truck so I would like to get the heat situation resolved. The blend door would be operated by the actuator ***** correct? they were bound but I sprayed the actuators with WD-40 and they adjust nicely and open and close nicely as well. Like I already stated the outer hose where it plugs into the heater box felt cold to the touch, but the rest of the hose all the way back to the block was warm to the touch.
More Turbo
Joined: Mar 2019
Posts: 530
Likes: 89
I'm not familiar with the non-ac boxes, but on the a/c boxes there's a cable on them that pulls and pushes the blend door open and shut when you move the top slider on your heater controls. I would check that your blend door is actually opening and closing. Other than that, if you want to check to see if your heater core is plugged you could pop off both hoses at the firewall and try to flush it out with a garden hose or something like that and see what comes out if anything.
Fleet Mechanic
Joined: Dec 2007
Posts: 1,505
Likes: 339
From: Wildwood Pa
I would suspect a plugged heater core. If someone used Bar's Leak in the radiator, that stuff will plug a heater core. I've had some luck reverse flushing heater cores. Remove the heater hoses at the engine. Take your garden hose & spray it into the hose that stays cold. You want a tight seal so it pressurizes the hose, forcing water back thru the core. You have to be careful if you are one of the lucky people that has really high water pressure, you don't want to blow the core apart. What you are doing is back flushing the core. Be prepared to get wet! Hopefully doing this a few times will get tons of water flowing thru the core.
I used to have to do this once a year to keep the heat working in my chevy Vega.
I used to have to do this once a year to keep the heat working in my chevy Vega.
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Elder User
Joined: Jun 2015
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From: York Pa.
The blend door is opening and closing so I guess it must be the heater core is plugged. Thanks guys I guess I'm gonna have to get wet.
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From: S/W Missouri, Polk county
X2 on garden hose flush the heater core. And if no real luck, try pouring some CLR (from Walmart) down the hoses (or I would get 2 pieces of 1' hose and hook to the heater core, for ease of application) and fill up the heater core, then tie the hose end off upward to keep the stuff in and then let it soak for 24 hrs. The CLR will eat up any calcium buildup. Be careful you do not really want any of that stuff in your eyes. And if that does not do it, then time to replace the heater core. None a/c truck its not that bad.
https://clrbrands.com/en-US/Products...e-Rust-Remover
https://clrbrands.com/en-US/Products...e-Rust-Remover
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Elder User
Joined: Jun 2015
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From: York Pa.
Update I pulled the hoses off at the block and attached my water hose to the outer hose going into the heater box and I have positive water flow. Trying to put water into the inner hose going into the box and the water does not flow as well. What do you think?
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Elder User
Joined: Jun 2015
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From: York Pa.
Update, I just kept flushing water up both hoses going into the heater box and eventually I got equal flow out both hoses.
I buttoned it all up refilled radiator with 50/50 and went for a drive. The end result is the heater finally works.
Thanks so much to the guys that helped and to this forum.
I buttoned it all up refilled radiator with 50/50 and went for a drive. The end result is the heater finally works. Thanks so much to the guys that helped and to this forum.
Thread Starter
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Elder User
Joined: Jun 2015
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From: York Pa.