98 how do i flush cooling system

98 how do i flush cooling system

Postby vastronaunt [OP] » March 9th 2016, 4:57pm

As ordered per lumps. Need to flush cooling system. Can you tell me the exact procedures or lead me to a reference. i did searching but no pearls seem to show up
Original Poster [OP]
vastronaunt
Fueling (3/8 tank)
Fueling (3/8 tank)
Years of Membership: vastronaunt has been a member for 5 full yearsvastronaunt has been a member for 5 full yearsvastronaunt has been a member for 5 full yearsvastronaunt has been a member for 5 full yearsvastronaunt has been a member for 5 full years
Posts: 47
Topics: 9
Joined: February 2016
Gender: Male
Alias (AKA):
Van Model Year: 1998
Van Make/Model: Chevrolet Astro
Extra Info: my vans dieing

Re: 98 how do i flush cooling system

Postby RECox286 » March 9th 2016, 6:41pm

It is like doing the dishes; scrape the goo off the plates, apply soap, agitate, drain, rinse, dry, and re-stack them for reuse.

You have to be familiar with the system; what the different parts do, how they do it, and why. Any sort of technical material

such as what is available at your LAPS will be better than the information you have at the moment. Start by getting as much

knowledge as you can. When I searched "flush cooling system" there were immediately more than 10 full pages of posts, I

would look over whatever is available on forum. Next, search the topic on U-Tube, I'll bet there are plenty of videos on the

subject.

In condensed form and FYI, here are the steps:

Obtain a flushing agent and a flush kit from your LAPS.

Drain out all the coolant, including the radiator and the block (there are plugs on both sides, and I usually have to poke into the holes).

Remove T-stat then reinstall water outlet housing and install block plugs.

Add flushing agent and top off with water (follow directions on flushing agent container).

Drain out ALL flushing mixture and flush with steady stream of garden hose water until clear while running engine. (don't rush !)

Drain all liquids (not forgetting about block plugs).

Install block plugs, new T-stat and service system with 50/50 mixture of GREEN anti-freeze and DISTILLED water.

Don't be in a rush. It usually takes me a good half day or more to do a proper job of it.

NOTE: You may find you will have to use the flushing agent more than once, be prepared !

Good hunting

Uncle Bob
Start a fire for a man and he will be warm for a day.
Set a man on fire and he will be warm the rest of his life.

Sent using two Progresso soup cans and a string
User avatar
RECox286
U.S. Armed Forces
U.S. Armed Forces
Purple Status (L6)
Purple Status (L6)
Years of Membership: RECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full yearsRECox286 has been a member for 10 full years
Posts: 5008
Topics: 40
Images: 0
Joined: July 2010
Location: South Jersey
Gender: Male
Alias (AKA): Uncle Bob
Van Model Year: 1993
Van Make/Model: Chevrolet Astro
Extra Info: RWD V6 [325K mi]

Re: 98 how do i flush cooling system

Postby Astro Pop » March 9th 2016, 8:38pm

Don't forget that the secondary purpose of engine oil is to cool. Think VW pancake engines & Harley Davidson engines. So for maximum engine efficiency FLUSH & change the oil regularly.

Good video on how to flush the radiator:.

https://www.youtube.com/watch?v=s--5ft5YiHg

Also some tech info on types of flushing.

http://www.sancarlosradiator.com/VoltageDrop/flush.htm

I used the three day flush (abbreviated to 36 hrs) and my cooling system looks factory fresh. But it's tricky to setup and requires an external pump. I happened to have an old fountain pump available. Now even with a new t-stat I can't get the temp over 170 degrees.
User avatar
Astro Pop
Firing on 2 Cylinders (L2)
Firing on 2 Cylinders (L2)
Years of Membership: Astro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full yearsAstro Pop has been a member for 8 full years
Posts: 1206
Topics: 41
Images: 9
Joined: March 2012
Location: CA
Alias (AKA): Xfirepop
Van Model Year: 1996
Van Make/Model: Chevrolet Astro
Extra Info: AWD - 5 inch lift

Re: 98 how do i flush cooling system

Postby Lumpy » March 10th 2016, 6:35pm

Open drain cock on bottom of radiator. Place big drain pan under there. Antifreeze is toxic to animals and it attracts them. Don't let it just drain on the ground or it will kill your dogs and cats.

Open radiator cap, radiator will now slowly empty through drain cock.

Disconnect upper and lower radiator hoses. Take them to LAPS and ask for replacements.

Disconnect hot water neck on engine. Take thermostat to LAPS and ask for a new one. They're five bucks. Gasket is another dollar.

Place garden hose in any opening - hose, radiator top or bottom, other hoses, eng block, anywhere and everywhere. Let the hose run on gentle for as long as it takes to get clear water flowing out.

Turn heater controls to HEAT and continue to flush.

Disconnect smaller water hoses that enter heater box, passenger side of the firewall - 2 hoses, upper and lower. Let gentle garden hose flow through both directions there as well. The sealant around those hoses where they enter the van is likely old and not sealing perfectly. Consider adding to or replacing the goo that seals there. Factory is the asphalt like stuff. You can use that or RTV rubber.

Flush, flush, flush. Then button it all up with new thermostat installed the right way up. Add 50/50 green coolant and clean water. Some use purified water. I don't. Run engine till it warms up. Keep an eye on the overflow reservoir. As the system "burps" air it will need more water/coolant. The mix doesn't have to be 50/50 to the nth degree. A little coolant, a little water, like that. In hot weather, the only thing coolant does is lubricate and add a little rust resistance. In freezing weather, coolant (anti-freeze) helps keep the water from freezing.

Check the coolant level every couple hours or few miles for the first couple days. It will continue to burp air and need more fluid.

Don't take the main radiator cap off while the system is hot. "You'll put yer eye out".

No critical torques. No special tools. Probably not even any jacking. Just dispose of the drained stuff responsibly. LAPS will take it for disposal or recycle or whatever they do with it.


Lump
User avatar
Lumpy
Deprived Privileges
Deprived Privileges
Firing on 8 Cylinders (L7)
Firing on 8 Cylinders (L7)
Years of Membership: Lumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full yearsLumpy has been a member for 10 full years
Posts: 10996
Topics: 261
Joined: April 2010
Location: Phoenix AZ USA
Gender: Male
Alias (AKA):
Van Model Year: 1989
Van Make/Model: Chevrolet Astro
Extra Info: 11 in. lift Camo


 
  • Related topics
    Replies
    Views
    Last post

Return to Engines

It is currently February 26th 2021, 7:10pm

Engines Forum
Engine Repairs, Modifications, Diagnostics, Tuning, Upgrading, Questions.

<a href="https://ad.doubleclick.net/ddm/trackclk/N8334.275400VERTICALSCOPEINC./B20209277.204028354;dc_trk_aid=407011718;dc_trk_cid=94070067;dc_lat=;dc_rdid=;tag_for_child_directed_treatment="target="_blank"><img src="https://tpc.googlesyndication.com/pagead/imgad?id=CICAgKDrrqWwMRCAARgcKAEyCN4sAjjtai4k" border="0" align="right">
<IMG SRC="https://ad.doubleclick.net/ddm/trackimp/N8334.275400VERTICALSCOPEINC./B20209277.204028354;dc_trk_aid=407011718;dc_trk_cid=94070067;ord=;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=?" BORDER="0" HEIGHT="1" WIDTH="1" ALT="Advertisement">
Moderator: chevy57bert
To create a new topic in Engines, click this button:
Previous topic Next topic
Recent Image Attachments
Attached by:
Ken2.7
in Engines
Views: 185
Comments: 10
Date: Feb 24 '21
Time: 2:02am
» Read last comment
Attached by:
Attached by: Mmusicman
Mmusicman
in Engines
Views: 185
Comments: 10
Date: Feb 23 '21
Time: 8:38pm
» Read last comment
Attached by:
Attached by: Mmusicman
Mmusicman
in Engines
Views: 185
Comments: 10
Date: Feb 23 '21
Time: 8:41pm
» Read last comment
Attached by:
Attached by: WinnieVan
WinnieVan
in Engines
Views: 185
Comments: 10
Date: Feb 23 '21
Time: 8:07am
» Read last comment
Attached by:
Ken2.7
in Engines
Views: 185
Comments: 10
Date: Feb 22 '21
Time: 11:43pm
» Read last comment
Sponsors

Who is online

Users browsing this forum: Google [Bot], Google Adsense [Bot] and 32 guests