How to do a COMPLETE coolant flush


  #1  
Old 03-15-08, 07:29 AM
M
Member
Thread Starter
Join Date: May 2006
Location: Massachusetts
Posts: 56
Upvotes: 0
Received 0 Upvotes on 0 Posts
How to do a COMPLETE coolant flush

I know how to flush and replace my coolant in my radiator, but I was wondering how to flush the coolant from the engine block and heater core.

I saw that Prestone makes a backflush coolant kit which flushes out the coolant through the heater core. But I don't like the idea of slicing my heater hose an installing a permanent T-valve in there. It sounds good in theory but I can see it leaking.

And I don't think the coolant flush solutions do any good. I think water does the job just fine.

Any suggestions?
 
  #2  
Old 03-15-08, 07:38 AM
dcjredline's Avatar
Member
Join Date: Dec 2007
Posts: 67
Upvotes: 0
Received 0 Upvotes on 0 Posts
Unless your interested in taking the heater core out (Have fun) then you are most likely going to have to cut the hoses.

Use a clamp and make it tight I have had the splits on alot of cars in the past and they dont leak. Check them often and if they start to you prolly need new hoses anyway.

Yeah I use water also not the flush liquid that is out there.
 
  #3  
Old 03-15-08, 08:26 AM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 19,281
Received 6 Upvotes on 6 Posts
Mark, I had the kit on a couple of older cars, but i don't think I would do it on either of mine now. What I do now takes a bit longer, but hey, good way to stay out in the garage and drink a few cold ones.

Park on a downhill slope, or just jack the rear end slightly. Open the drain valve or pull the bottom hose, crack the rad cap, drain and refill, run engine 3 min or so, drain and refill. Run it to temp with heater on, let cool, drain and refill with antifreeze. This is gonna get probably 95% or more of the old stuff out.

Hey, I said it takes a while. And yes, I dispose of it correctly, I have people...lol
 
  #4  
Old 03-15-08, 05:47 PM
M
Member
Thread Starter
Join Date: May 2006
Location: Massachusetts
Posts: 56
Upvotes: 0
Received 0 Upvotes on 0 Posts
Originally Posted by dcjredline
Unless your interested in taking the heater core out (Have fun) then you are most likely going to have to cut the hoses.

Use a clamp and make it tight I have had the splits on alot of cars in the past and they dont leak. Check them often and if they start to you prolly need new hoses anyway.

Yeah I use water also not the flush liquid that is out there.
I really would like to try the backflush kit, but on my car (1999 Mercury Mountaineer V8), the heater hoses are really crammed in there and it would be tough to find a straight enough section of the hose to get the T-valve in.

I think I'll go with Gunguy's suggestion of drain, refill, run the engine with the heater on, drain, refill, repeat, etc.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: