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#1 |
Registered User
![]() Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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Heater question
I have a weird situation going on. My heater blows cold air all the time. I have felt both heater hoses after the truck has gotten to operating temperature and they are hot but the heater air is barely warmer than outside air.
I have noticed leaves and pine needles blowing out of the heater duct. Is it possible for the leaves to have the heater core blocked and the air is moving around the core without getting heated? It feels like it blows fairly hard, just not warm.I am about to pull off the heater box but that is such a pain in the arse. I doubt I will need a heater much, but when you need it, you need it. Thanks, Darryl |
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#2 |
Resident Curmudgeon
![]() Join Date: Dec 1999
Location: NH
Posts: 6,664
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Is it non ac? If so, remove the plastic cover that the "hot - cold" cable runs too and check to make sure the flap to divert the outside air thru the heater core is actually working. This is under the dash on the passenger side. The cable has a clamp that will allow your to adjust it.
I know these things because it was 10 below zero here this morning. ![]()
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Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter ![]() Maybe I need to sell some of this crap ![]() Yet another Bozo with a sawz-all |
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#3 |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Heaters? What are they used for?
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#4 |
Registered User
![]() Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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it is non-ac... Thanks, I 'll check that
10 below... ouch I couldn't do it. |
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#5 |
Registered User
![]() Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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Well I think the core must be blocked. I can feel the door move that CPNE said to check. But when it is in the heat position it blows a lot less than when it is in the other position.
I didn’t start the truck so I don’t know if the temperature would change depending on the position. I guess I know what I get to do after work tonight. Oh Boy!! I mainly use it for a defroster. I drive less than fifteen miles to work and it rarely gets lower than the low 30’s here The pisser is I did it last year on my 68… ended up selling that truck in the spring… |
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#6 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Burp your coolant system. The stock configuration of the coolant system has excess coolant vented to the ground. After a hot summer you might have lost a bit of coolant so now you have an air bubble.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#7 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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I just removed and cleaned out my blower box and vents. Man I got about 10 lbs. of crap out of there! There was so much crap in there! You will be amazed by how much junk accumulates in there.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#8 |
Registered User
Join Date: Sep 2000
Location: Cincinnati,OH,USA
Posts: 464
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Your thermostat might be stuck in the open position.
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69 GMC 1 Ton Longhorn 37 Chevy Coupe |
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#9 |
Registered User
![]() Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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not as much as i expected...it still doesn't blow as warm as thought but it was a big difference... i'll check the thermostat later...thanks guys
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#10 |
Registered User
Join Date: Apr 2003
Location: missouri city, tx
Posts: 4,486
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thats quite abit of crap
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70 longbed 496/th400/Ford 9" |
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#11 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,770
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You should also check to see if you are getting coolent flow through the heater core. If not that would be your problem and you would need to replace the heater core. WES www.ClassicHeartbeat.com
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#12 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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back flush the heater core you will probably get a lot of black nasty looking crap out of it. when i replaced mine the old one was 2 or 3 pounds heavier than the new one because of all the crud that was inside of it
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#13 |
Registered User
![]() Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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I did back flush the core, several times until the water was clear. I don't think it's getting all that warm. I'll pull the thermostat and put in another one. Which one should I put in 160, 180 or 195?
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#14 |
Registered User
Join Date: Oct 2000
Location: St. Johns, Arizona
Posts: 2,660
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180.
Make sure that the hose from the water pump goes into the bottom of the heater core.
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