02-14-2017, 07:38 AM
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#1
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Registered User
Join Date: Aug 2015
Location: Fulshear, TX
Posts: 266
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Coolant change help
Howdy folks,
This weekend I attempted to tackle the front engine mount replacement along with a new water pump, thermostat and coolant. After just completing the IMS, RMS and new flywheel/clutch and variocam tensioner pads project I thought I might as well take care of these other items while the car is on stands. I was pretty certain the engine mount was original and needed replacement as well. I was correct regarding the mount, it was cracked all the way around and was due for replacement.
My question concerns the coolant. I searched and read up as much as I could find regarding draining the existing coolant and which proper coolant to put in the system, etc. so I thought I was pretty well informed and ready. I ran the climate control up to high, removed the coolant drain plug as well as all three large hoses and the two heater core hoses that lead to the front radiators. I also removed the water pump and thermostat housing. I angled the car by lowering the back end and when complete I was still only able to get approx. 5 gallons of the old coolant out. Oh, I did remove the coolant cap as well. Coolant was green, could be original Porsche coolant from 2001 but I have no way of knowing for sure.
I did install the new water pump, thermostat, engine mount and reconnected all the hoses. I also have an Airlift to refill the system with the new Porsche pink coolant. I should probably fill the system with distilled water first to flush.
My concern is I think I did what I should have to remove the coolant but I didn't get the 6 or so gallons out. Will flushing with water once be enough to go ahead and refill with the new coolant? It may seem like a simple question but I don't want to make a mistake after getting this far and I want to put the car back on the road.
Thanks
Dave in TX
2001S
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02-14-2017, 07:43 AM
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#2
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Registered User
Join Date: May 2014
Location: S.California
Posts: 2,027
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What was the minimum vacuum reading you maintained with the AIrlift throughout the entire refill process?
That may be the problem.
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02-14-2017, 07:49 AM
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#3
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
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Short of standing the car on end and shaking it a couple of times, you are not going to get all the coolant out. The best you are going to get doing a gravity drain is around 80-85% of the system's capacity. Refilling the car with distilled water, then running it for a bit before draining will help get rid of any remaining old coolant.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-14-2017, 08:27 AM
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#4
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Registered User
Join Date: Aug 2015
Location: Fulshear, TX
Posts: 266
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Quote:
Originally Posted by Gelbster
What was the minimum vacuum reading you maintained with the AIrlift throughout the entire refill process?
That may be the problem.
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I haven't used the airlift yet, so the system is still empty. I actually just kind of ran out of time this weekend so I thought I would stop here and get back to filling the system after some more checking with the experts.
Quote:
Originally Posted by JFP in PA
Short of standing the car on end and shaking it a couple of times, you are not going to get all the coolant out. The best you are going to get doing a gravity drain is around 80-85% of the system's capacity. Refilling the car with distilled water, then running it for a bit before draining will help get rid of any remaining old coolant.
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Thanks JFP. I'll do that and cross my fingers that I haven't screwed anything up with all the work I have done recently!
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02-14-2017, 08:34 AM
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#5
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Registered User
Join Date: May 2014
Location: S.California
Posts: 2,027
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Just be careful not to loose the vacuum when operating the valve/connecting the suction tube to the coolant. And of course do not pull more than the recommended max vacuum
I found it helpful to have the coolant in translucent containers to avoid sucking air. I found used 1 gal. milk jugs worked well with my Airlift clone.
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02-14-2017, 09:08 AM
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#6
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Registered User
Join Date: Sep 2012
Location: S. New Jersey
Posts: 1,239
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I did exactly the same steps you did except I did 2 distilled water flushes because I to had Green coolant. I never got more than 4 - 5 gals out each time.
Once you get the vacuum up before refill, let it stand for a couple minutes. If it holds the recommended vacuum level, that should indicate you have no leaks.
I was prepared for up to 6 gals replace with 3 gals pink coolant and 3 gals of distilled water.
Now I have about 2 gals of 50/50 left over
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Seal Grey
Last edited by kk2002s; 02-14-2017 at 09:10 AM.
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02-14-2017, 10:19 AM
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#7
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,793
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You can also use one of the airlift "plugs and put in in the coolant line to the front and blow some compressed air through,. It should push out a bit more coolant. As JFP said, you won't get it all out
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02-14-2017, 11:01 AM
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#8
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Registered User
Join Date: Aug 2015
Location: Fulshear, TX
Posts: 266
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Quote:
Originally Posted by Gelbster
Just be careful not to loose the vacuum when operating the valve/connecting the suction tube to the coolant. And of course do not pull more than the recommended max vacuum
I found it helpful to have the coolant in translucent containers to avoid sucking air. I found used 1 gal. milk jugs worked well with my Airlift clone.
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That's a good point. I am thinking 20 psi Max for the Airlift. Perhaps slightly less would be sufficient to load the system with coolant.
Quote:
Originally Posted by kk2002s
I did exactly the same steps you did except I did 2 distilled water flushes because I to had Green coolant. I never got more than 4 - 5 gals out each time.
Once you get the vacuum up before refill, let it stand for a couple minutes. If it holds the recommended vacuum level, that should indicate you have no leaks.
I was prepared for up to 6 gals replace with 3 gals pink coolant and 3 gals of distilled water.
Now I have about 2 gals of 50/50 left over
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I have enough to make 6 gallons of pretty pink coolant. If all remains the same after flushing with water I will have some left over.
Quote:
Originally Posted by JayG
You can also use one of the airlift "plugs and put in in the coolant line to the front and blow some compressed air through,. It should push out a bit more coolant. As JFP said, you won't get it all out
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I thought that it would be sensible to somehow blow the coolant out instead of relying on the gravity approach but I couldn't really find much on that.
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02-14-2017, 11:05 AM
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#9
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Registered User
Join Date: May 2014
Location: S.California
Posts: 2,027
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The "puge old coolant with pressure" could be an interesting next post :-)
We'll all be interested because you are right - replacing some of the coolant is only half the job done.
[QUOTE=dsallean;527060
I thought that it would be sensible to somehow blow the coolant out instead of relying on the gravity approach but I couldn't really find much on that.[/QUOTE]
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02-14-2017, 12:19 PM
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#10
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
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I would be very cautious about using air pressure to push the coolant out. These cooling systems are designed to operate at around 18 PSIG pressure; going higher than that, which is very easy to do with an air line, can damage some expensive and hard to get at parts.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-14-2017, 01:56 PM
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#11
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,456
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Absolutely agree with JFP in PA. Also these cooling systems get older. Don't force things.
I think the best method to get everything out is gravity. Where have you opened the system? Front or back. If back, raise the front of the car with a lift. Similar to the recommended filling process if you have no pressure system.
Regards, Markus
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