Recent Topics
49 years ago today....
by pbm
07/20/18 01:24 PM
Why do we care so much about oil?
by camrydriver111
07/20/18 01:14 PM
Which one should I sell/keep?
by SevenBizzos
07/20/18 12:18 PM
What's Shakin' at Amazon Today?
by TheLawnRanger
07/20/18 11:43 AM
2018 Hyundai Accent
by zeke1985
07/20/18 11:15 AM
Fresh footage of my Corvette on-track
by dparm
07/20/18 09:41 AM
Hedge trimmer "resin solvent"
by Rand
07/20/18 09:21 AM
Micrometer-digital
by Gito
07/20/18 09:00 AM
MMO and LSPI?
by KCJeep
07/20/18 08:49 AM
Sludged 2010 Cobalt 2.2 making noises
by jk_636
07/20/18 08:32 AM
Now oil pump while I have the pan off?
by callbay
07/20/18 07:19 AM
Anyone Remember DMSO Solvent ?
by LoneRanger
07/20/18 06:52 AM
aluminun bed in f150 pick um ups
by edwardh1
07/20/18 06:29 AM
Lawnmower 2cycle and 4cycle fuel
by Greaser73
07/20/18 04:00 AM
Rotella T6 5W40, 5000Mi, 1991 Ford 460 - RV
by MutantGarage
07/20/18 12:23 AM
2013 SUBARU Outback, M1EP 0w20, 14190mi, 74465 tot
by NO2
07/19/18 11:52 PM
91 Ford 460 - noisy lifters at Idle when hot
by MutantGarage
07/19/18 11:49 PM
Great deal on PP 5w30
by 60ampfuse
07/19/18 11:48 PM
Motorcraft, 5W-30, 2425 miles, 2018 3.5 F EcoBoost
by cdlamb
07/19/18 11:40 PM
Off-Road Trailer Tires
by troutfisher
07/19/18 09:55 PM
Newest Members
TA128, Elantra16, Peterbilt52, CarllT100, 99SK04GTX
65515 Registered Users
Who's Online
91 registered (4WD, andyd, 2010Civic, AandPDan, 2004tdigls, 12 invisible), 1693 Guests and 30 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65515 Members
67 Forums
287355 Topics
4793903 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#3176971 - 11/03/13 09:15 AM Best cleaner to flush a heater core
nomochevys Offline


Registered: 11/26/05
Posts: 394
Loc: Ky
Still trying to work out some kinks. I have heat but its nowhere near what it should be. Truck is a 96 GMC Sonoma 4.3. I am pretty much convinced the heater core is plugged up to some degree. What is the best thing I can use to help clean it out with?

Top
#3176984 - 11/03/13 09:29 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
Warstud Offline


Registered: 09/02/05
Posts: 5495
Loc: MIchigan
What have you done so far to get more heat?

Top
#3176996 - 11/03/13 09:35 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
spasm3 Offline


Registered: 05/30/10
Posts: 8778
Loc: North Carolina
I was under the impression that most heater cores today, always have flow. On older cars, the heat control shut off flow to the heater core and this caused gunk and build up. Are you sure the engine is up to temp, that the coolant is not low, and that the air flow blend door is working?
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

Top
#3177005 - 11/03/13 09:45 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Citric acid flush and degreasing per the MB FSMs.

Top
#3177009 - 11/03/13 09:47 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
michaelluscher Offline


Registered: 10/07/12
Posts: 2439
Loc: Staten Island, NY
If you've fully established that the heater core is plugged.
CLR would be quite good, a couple vinegar rinses after that would be good.
_________________________
'06 Toyota Camry SE V6 3MZ-FE 100k
'01 Mercury Villager Estate VG33E 52k
'06 Ford Taurus SE Vulcan 60k
'13 Chrysler 300 3.6 Pentastar 230k

Top
#3177016 - 11/03/13 09:54 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
Sawdusted Offline


Registered: 12/25/12
Posts: 426
Loc: The Tropical Fine City
Eric the car guy did a youtube video on that some time ago. He used some cleaner plus compressed air to blow out the crud. I think it's a good video. Watch it if you get a chance.
_________________________
2003 Lexus RX300, 1MZ-FE
2011 Volvo S60, 2.0T, B4024T6

Top
#3177021 - 11/03/13 09:56 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
nitehawk55 Offline


Registered: 04/01/10
Posts: 1084
Loc: Ontario , Canada
Feel the heater hoses . If they are hot it's flowing , cool not .
_________________________
05 Ford Five Hundred AWD 3.0 DOHC V6 CVT tranny

Top
#3177032 - 11/03/13 10:05 AM Re: Best cleaner to flush a heater core [Re: spasm3]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
Originally Posted By: spasm3
I was under the impression that most heater cores today, always have flow. On older cars, the heat control shut off flow to the heater core and this caused gunk and build up. Are you sure the engine is up to temp, that the coolant is not low, and that the air flow blend door is working?


This is not so much the case. There are plenty of modern cars that use a heater control valve to shut off coolant flow to the heater core and also quite a few that use a heater control valve to negate the need for a hot/cold blend door.

This heater doesn't have that. If it's partially clogged, some sort of weak acid and lots of water should be used. If that doesn't work it's time for a new one.

Top
#3177033 - 11/03/13 10:06 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
Chris142 Offline


Registered: 06/05/03
Posts: 16966
Loc: Deplorable in apple valley, ca
Air and water if its plugged up
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

Top
#3177070 - 11/03/13 10:27 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
PhillyJoe Offline


Registered: 03/19/09
Posts: 656
Loc: PA
I had little heat in my '07 Grand Prix. I flushed the system of dexcool and changed the thermostat. Heater hoses were hot to the touch. Still had little heat. New coolant was clear of gunk. Starting to think I had a bad core.
Read up on how to replace a heater core and thought, there has to be another answer.
Since one heater hose already has the flush "t", I cut the other and put in another t. I hooked up the garden hose to to one heater hose and squeezed the nozzle - out came rusty colored pudding. It ran clear in a few seconds. Then I hooked up the nozzle to the other hose to back flush. Surprisingly, more gunk came out. Hooked the hoses back to normal, refilled the coolant I lost, bled the system, and you could cook a roast in the car now.

Top
#3177081 - 11/03/13 10:38 AM Re: Best cleaner to flush a heater core [Re: PhillyJoe]
crazyoildude Offline


Registered: 07/23/08
Posts: 9808
Loc: New Jersey
i disconnect both hoses from the heater core and blast through water in one direction then the other a few times that works great
_________________________
Check To See That The Oil Jugs You Buy Have The Exact Amount Of Oil In Them And Have An Inner Seal Under The Cap. I Use Mobil 1 And Fram Ultra Filters

Top
#3177102 - 11/03/13 11:04 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
mattwithcats Offline


Registered: 06/13/13
Posts: 1678
Loc: Virginia
Disconnect the hoses and run some water from a garden hose in.

If this does not work, a teaspoon or two (max 3 teaspoons or a tablespoon) or plain dishwasher detergent.
No lemon scent, not orange scent.
Not CLR or anything acidic, heater core is very thin aluminum.

Rinse out the core, reconnect...


Edited by mattwithcats (11/03/13 11:05 AM)
_________________________
2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)

Top
#3177119 - 11/03/13 11:22 AM Re: Best cleaner to flush a heater core [Re: nomochevys]
nitehawk55 Offline


Registered: 04/01/10
Posts: 1084
Loc: Ontario , Canada
Important to flush core in both directions .
_________________________
05 Ford Five Hundred AWD 3.0 DOHC V6 CVT tranny

Top
#3177123 - 11/03/13 11:27 AM Re: Best cleaner to flush a heater core [Re: nitehawk55]
Garak Offline


Registered: 12/05/09
Posts: 24733
Loc: Regina, Saskatchewan, Canada
Originally Posted By: nitehawk55
Feel the heater hoses . If they are hot it's flowing , cool not .

And if there's a problem, how hard is it to change on this vehicle? If it's a relatively easy change (under 20 minutes on my F-150, hours upon hours on the old LTD), it isn't even worth playing with if it's clogged or weak.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

Top
#3177157 - 11/03/13 12:18 PM Re: Best cleaner to flush a heater core [Re: Garak]
nitehawk55 Offline


Registered: 04/01/10
Posts: 1084
Loc: Ontario , Canada
Originally Posted By: Garak
Originally Posted By: nitehawk55
Feel the heater hoses . If they are hot it's flowing , cool not .

And if there's a problem, how hard is it to change on this vehicle? If it's a relatively easy change (under 20 minutes on my F-150, hours upon hours on the old LTD), it isn't even worth playing with if it's clogged or weak.


Feeling the heater hoses is a simple test just to give you an idea if the core is plugged or not . Totally plugged or almost they will be cool to warm compared to the engine hoses . If hot it should be OK but a flush is always the first method to try and clean out and it generally helps unless it's really plugged bad .Even if the hoses are hot it still is good to flush if you feel you are not getting the heat you should . Always the risk of there being a leak afterward though if lots of corrosion going on .
Make sure your engine is coming up to proper op temp or the thermostat is suspect .And of course check the operation of the heater doors or a flow valve if it has one .

How long ? no idea .


Edited by nitehawk55 (11/03/13 12:21 PM)
_________________________
05 Ford Five Hundred AWD 3.0 DOHC V6 CVT tranny

Top
Page 1 of 2 1 2 >