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Recognise Coolant Residue? Blocked heater cores. #4645750
01/25/18 10:26 AM
01/25/18 10:26 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline OP
mightymousetech  Offline OP
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Had an MDX in the shop. Signs of plugged heater cores (front and rear) and partially blocked rad (hot/cold spots).

Tried flushing with CLR, degreaser, citric acid to no avail. Ended up replacing both heater cores and the rad, along with a new thermostat and water valve.

Now that the job is done (ugh), I pulled the bottom tank off the rad, and found this residue. It is like a gritty, slimy jelly. The vehicle did have aftermarket, non Honda Type 2 coolant. No idea what it was, smelled terrible, was greenish in colour.

Anybody seen residue like this?




Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645797
01/25/18 11:11 AM
01/25/18 11:11 AM
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
It's Flubber!


If you want the job done right......do it yourself.
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645807
01/25/18 11:16 AM
01/25/18 11:16 AM
Joined: Jun 2003
Posts: 17,373
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,373
Deplorable in apple valley, ca
Stop leak?


02 Wrangler durablend 10w40
87 F250 traveler 15w40
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Can am maveric edge 5w40
57 case tractor 15w40
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645819
01/25/18 11:25 AM
01/25/18 11:25 AM
Joined: Aug 2004
Posts: 3,297
Raleigh ,NC CSA
rshaw125 Offline
rshaw125  Offline
Joined: Aug 2004
Posts: 3,297
Raleigh ,NC CSA
Looks like what was in my Buick courtesy of Death-cool.To flush it out I drained the death-cool and filled with water. Drove it for two days (Summer) ran the heat and drained, repeat.


2012 Porsche Carrera S
2016 Ford Edge 2.0
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Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645828
01/25/18 11:33 AM
01/25/18 11:33 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline OP
mightymousetech  Offline OP
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
I suspect it may be silicate/phosphate precipitate from using an improper coolant.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645838
01/25/18 11:48 AM
01/25/18 11:48 AM
Joined: Oct 2014
Posts: 11,857
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,857
Idaho
Mixed coolants?


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Recognise Coolant Residue? Blocked heater cores. [Re: CT8] #4645852
01/25/18 11:57 AM
01/25/18 11:57 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline OP
mightymousetech  Offline OP
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Originally Posted By: CT8
Mixed coolants?


That is my feeling. Customer had his timing belt/water pump done a year previously at a independent garage.

Sucks because the heater core/rad job required 18 hours, and nearly $2k in parts, and that was being very generous to the customer.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645888
01/25/18 12:35 PM
01/25/18 12:35 PM
Joined: Jun 2002
Posts: 12,523
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,523
The Motor City
It looks a lot like water glass from the silicated compounds in "green" coolant. Citric acid should have taken care of it.

Isn't this why they used to rod out radiators way back when?

Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4645900
01/25/18 12:51 PM
01/25/18 12:51 PM
Joined: Jan 2013
Posts: 1,848
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,848
Texas
Our water is very hard with lime / calcium deposits . That is why they used to dod out radiators when I was young .

I have 2 cars with DexCool . If I was to switch , what would be the proper coolant ?

Thanks , :-)


Wyr
God bless
Re: Recognise Coolant Residue? Blocked heater cores. [Re: WyrTwister] #4645907
01/25/18 12:55 PM
01/25/18 12:55 PM
Joined: Apr 2017
Posts: 972
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 972
SF BAY AREA, CA
Originally Posted By: WyrTwister
Our water is very hard with lime / calcium deposits . That is why they used to dod out radiators when I was young .

I have 2 cars with DexCool . If I was to switch , what would be the proper coolant ?

Thanks , :-)


Keep the dexcool, there is nothing wrong with it in gm vehicles as long as it's maintained properly and not mixed with non-dexcool coolants.


2007 Crown Vic P71 4.6 ~127K Miles, RP HPS 5W-30, RP 20-820, Daily Driver.
2010 Escape FWD 2.5 ~90K Miles, Castrol Edge EP 5W-30, Wix 51348, Rented on Turo.
Re: Recognise Coolant Residue? Blocked heater cores. [Re: WyrTwister] #4646047
01/25/18 03:25 PM
01/25/18 03:25 PM
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
Originally Posted By: WyrTwister
Our water is very hard with lime / calcium deposits . That is why they used to dod out radiators when I was young .

I have 2 cars with DexCool . If I was to switch , what would be the proper coolant ?

Thanks , :-)


Distilled water and more Dexcool. I run Dexcool in my 2008 3/4 ton suburban. I won't risk changing to something else. It's running fine. Changed it once, will do again next year.

Last edited by Snagglefoot; 01/25/18 03:26 PM.

If you want the job done right......do it yourself.
Re: Recognise Coolant Residue? Blocked heater cores. [Re: dogememe] #4646048
01/25/18 03:25 PM
01/25/18 03:25 PM
Joined: Aug 2003
Posts: 12,905
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,905
NE,Ohio
Originally Posted By: dogememe
Originally Posted By: WyrTwister
Our water is very hard with lime / calcium deposits . That is why they used to dod out radiators when I was young .

I have 2 cars with DexCool . If I was to switch , what would be the proper coolant ?

Thanks , :-)


Keep the dexcool, there is nothing wrong with it in gm vehicles as long as it's maintained properly and not mixed with non-dexcool coolants.


And not run low, and kept fresh, and in good condition, and a good radiator cap.


Yep alot of ands... Deathcool works great until it doesnt. It has many advantages. to old green


2019 Jeep Cherokee Trailhawk 2.0T
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4646127
01/25/18 05:04 PM
01/25/18 05:04 PM
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
If you're really paranoid, buy the Dexcool from the GM dealer. Wasn't much more than the aftermarket.


Last edited by Snagglefoot; 01/25/18 05:06 PM.

If you want the job done right......do it yourself.
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4646245
01/25/18 07:30 PM
01/25/18 07:30 PM
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,350
SE British Columbia, Canada
Fresh Dexcool s a bright orange and looks sort of pink or red when inside the plastic reservoir. The part number on the jug is the Canadian part number.





Last edited by Snagglefoot; 01/25/18 07:31 PM.

If you want the job done right......do it yourself.
Re: Recognise Coolant Residue? Blocked heater cores. [Re: mightymousetech] #4646281
01/25/18 07:58 PM
01/25/18 07:58 PM
Joined: Sep 2013
Posts: 10,462
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,462
Indiana
Could be tire slime? laugh


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

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