Flushing the heater core? - Chevy Impala SS Forum
Impala SS Forum
Go Back   Chevy Impala SS Forum > 91-96 Impala/B-body > Heating/Cooling/HVAC
New User? Register - Forgot Password

Reply
 
Thread Tools Display Modes
  #1  
Old 11-15-2011, 11:55 AM
Man From Knobstock's Avatar
Man From Knobstock Man From Knobstock is offline
Senior Member
 
Join Date: Mar 2009
Location: Port Orchard, Washington
Posts: 324
Man From Knobstock is on a distinguished road
Default Flushing the heater core?

I have good air coming out of my heater and defrost, but only moderate heat. I'm wondering if perhaps the core could/should be flushed. It is, after all, simply a reverse radiator. Perhaps I could do a radiator flush with the heater turned on and that might do the trick.

And yes, the first thing I'll do is check to see if the hoses are bad or clogged.

Advice anyone?
__________________


Knobby,
Port Orchard, Washington

1995 Buick Longroof GS Clone Project Car
http://longroofgransport.wordpress.com/
B-Body and Wagon Cruise on the Western Shore of Puget Sound this coming May! Stay tuned.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-15-2011, 12:14 PM
rematar's Avatar
rematar rematar is offline
Senior Member
 
Join Date: Nov 2005
Location: Edmonton, Alberta
Posts: 2,723
rematar is an unknown quantity at this point
Default

If you are a member of the no heat club, read here. If you search for flush in the heating/cooling/hvac section there are several other threads.
Flushing the heater core may help for awhile, you should flush the entire cooling system through the bottom of the block (knock sensors), these engines have a history of sediment.
__________________
05 magnum rt with srt8 300 front
95 dcm wb4 rmw funeral car from fred - sold
93 white woody rmw - sold
Reply With Quote Quick reply to this message
  #3  
Old 11-15-2011, 01:28 PM
Man From Knobstock's Avatar
Man From Knobstock Man From Knobstock is offline
Senior Member
 
Join Date: Mar 2009
Location: Port Orchard, Washington
Posts: 324
Man From Knobstock is on a distinguished road
Default

Quote:
Originally Posted by rematar View Post
If you are a member of the no heat club, read here. If you search for flush in the heating/cooling/hvac section there are several other threads.
Flushing the heater core may help for awhile, you should flush the entire cooling system through the bottom of the block (knock sensors), these engines have a history of sediment.
When I swapped out the LT-1 a few months ago, I had everything flushed completely. But does that automatically flush the radiator, too? Or does it need to be turned on to be included?
__________________


Knobby,
Port Orchard, Washington

1995 Buick Longroof GS Clone Project Car
http://longroofgransport.wordpress.com/
B-Body and Wagon Cruise on the Western Shore of Puget Sound this coming May! Stay tuned.
Reply With Quote Quick reply to this message
  #4  
Old 11-16-2011, 12:12 PM
kiddpitt kiddpitt is offline
Senior Member
 
Join Date: Jan 2010
Location: Pottstown, PA
Posts: 850
kiddpitt is on a distinguished road
Default

I don't have an answer for your radiator question, but I had no heat for 2 years. I did the heater core flush a couple weeks ago and have heat.

Don't forget to replace your Tee and Restrictor. Also, the enhanced bleeder valve is a must have.
Reply With Quote Quick reply to this message
  #5  
Old 11-16-2011, 03:20 PM
SimplyTheBeSS's Avatar
SimplyTheBeSS SimplyTheBeSS is offline
Senior Member
 
Join Date: Aug 2010
Location: St. Louis, MO
Posts: 2,368
SimplyTheBeSS is on a distinguished road
Default

Anytime you open up the cooling system make sure you properly bleed it. Not doing that will cause you severe grief.

Like others have said, pull the knock sensor to get the gunk out, when you flush the core flush it back and forth in both directions. I find using a piece of tube connected to a garden hose and using the heatercore hoses works pretty well. Just be gentle on the core at first, if it is really clogged taking a full force water pressure out of a hose might be a bit much. Don't want to blow your core out, remember it is at least 15 years old. That being said, if the core is clean it should be able to take it all.
__________________
1994 SS - GRAIL Webmaster, St. Louis, MO
View our Tech/Guide page for everything from your basic oil change to Manual transmission swaps!

Reply With Quote Quick reply to this message
  #6  
Old 11-16-2011, 03:29 PM
juniorwatson's Avatar
juniorwatson juniorwatson is offline
Senior Member
 
Join Date: Aug 2007
Location: State College, PA
Posts: 1,478
juniorwatson is on a distinguished road
Send a message via ICQ to juniorwatson
Default

Quote:
Originally Posted by Man From Knobstock View Post
When I swapped out the LT-1 a few months ago, I had everything flushed completely. But does that automatically flush the radiator, too? Or does it need to be turned on to be included?
What do you mean when you write I had everything flushed completely?

So you mean just the engine block, heads and radiator?

Heater core does not turn on or off. You flush it by using a mild amount of pressure from the garden hose at the direct connection. ALSO use a a Prestone brand cooling system cleaner and run for 15 mins at operating temperature in the entire closed cooling system. Flush with clean water again, and then fill using distilled water and coolant.
__________________
'96 - W/'96 9C1 Rear. Blah, Blah, Blah....

Reply With Quote Quick reply to this message
  #7  
Old 12-15-2011, 09:07 AM
chapel's Avatar
chapel chapel is offline
Member
 
Join Date: Nov 2010
Posts: 82
chapel is on a distinguished road
Default

Quote:
Originally Posted by rematar View Post
If you are a member of the no heat club, read here. If you search for flush in the heating/cooling/hvac section there are several other threads.
Flushing the heater core may help for awhile, you should flush the entire cooling system through the bottom of the block (knock sensors), these engines have a history of sediment.
these are things I wish I read before it got so cold out...
__________________
1995 Buick Roadmaster Limited Estate Wagon
BATTLE WAGON
Reply With Quote Quick reply to this message
  #8  
Old 12-15-2011, 01:41 PM
Marky Dissod Marky Dissod is offline
Senior Member
 
Join Date: Sep 2005
Location: (718)-
Posts: 998
Marky Dissod is an unknown quantity at this point
Default

The trick is to [ideally, backflush, flush, and then again] backflush each component SEPARATELY.

[Back]Flushing the entire cooling system just shifts the contaminants & detritus from one component to the other[s].
__________________
1g1bl82p7rr127841
Rest In Pieces, In Peace
Reply With Quote Quick reply to this message
  #9  
Old 12-15-2011, 07:06 PM
Man From Knobstock's Avatar
Man From Knobstock Man From Knobstock is offline
Senior Member
 
Join Date: Mar 2009
Location: Port Orchard, Washington
Posts: 324
Man From Knobstock is on a distinguished road
Default Flushing worked! Now it's TOO hot! LOL

I had an hour to spare today, and decided -- what the hey -- I'll try flushing out the heater core since I was under the hood replacing the tensioning pulley anyway. Can't say that I took it all that seriously, either; didn't use radiator flush and didn't have the nerve to use the Lime-Away than another poster suggested.

So, for better or worse, all I did was disconnect the pair of heater bypass hoses at the point where they intersected the water pump (plugging the lines to the block) and ran moderately high water up through the lines first in one direction and then the other. A fair amount of sludge came out, but it was hardly an ah-ha moment.

I re-buttoned everything, turned on the heat (this morning I had it set at 90 degrees and it barely reached room temperature) and POW! I coulda roasted hot dogs on the dash vents, and actually felt uncomfortably warm. What a difference!

This will be a wonderful change when it snows this weekend. No more sitting in the driveway waiting half an hour for a tiny space to defrost so I can see the road.

Next summer I'll do the complete flush and really clean things up. Thanks for all the good advice, guysl
__________________


Knobby,
Port Orchard, Washington

1995 Buick Longroof GS Clone Project Car
http://longroofgransport.wordpress.com/
B-Body and Wagon Cruise on the Western Shore of Puget Sound this coming May! Stay tuned.
Reply With Quote Quick reply to this message
  #10  
Old 01-16-2012, 08:46 PM
roadmaster'94 roadmaster'94 is offline
Member
 
Join Date: Nov 2011
Location: MN
Posts: 67
roadmaster'94 is on a distinguished road
Default

how do i tell which hose to run water and pressure through for the heater core? i assume i want to reverse the flow
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:18 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
(c) 2007-2014 Impala SS Forum