COOLANT FLUSH

FROM RADIATORS TO THERMOSTATS TO HEATER CORES, IT GOES HERE.

Moderator: LiftedAWDAstro

Post Reply
nsx1pete
I am merely driving my van
I am merely driving my van
Posts: 3
Joined: Fri Apr 09, 2010 3:16 pm
antispam: No
How many wheels are on an Astro van? (4): 4

COOLANT FLUSH

Post by nsx1pete » Tue Apr 13, 2010 2:34 am

HI, I'M A NEWBY TO THE FORUM AND WANTED SOME HELP ON FLUSHING MY COOLANT ON 2002 ASTRO, I CAN'T FIGURE OUT WHAT HEATER HOSE IS THE INLET OR OUTLET, PLEASE HELP.

PETER

User avatar
Smiliesafari
ASV Supporter
ASV Supporter
Posts: 2681
Joined: Sat Dec 02, 2006 8:34 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Orlando, FL

Re: COOLANT FLUSH

Post by Smiliesafari » Tue Apr 13, 2010 2:42 am

Hi Peter........Welcome to the site. It doesn't really matter which one you use. Either one will flush the engine. Remove the lower radiator hose and let the water run until it comes out clear.
1996 Safari SLX Hotair balloon transport vehicle

nsx1pete
I am merely driving my van
I am merely driving my van
Posts: 3
Joined: Fri Apr 09, 2010 3:16 pm
antispam: No
How many wheels are on an Astro van? (4): 4

Re: COOLANT FLUSH

Post by nsx1pete » Tue Apr 13, 2010 2:50 am

THANKS FOR THE FAST RESPONSE, I WANTED TO USE A PRESTONE FLUSH KIT AND IT SPECIFIES WHAT HEATER HOSE TO TAP, ALSO WHILE I'M ON IT WHAT COOLANT CAN YOU RECOMMEND. 2002 ASTRO

PETE

rlsllc
I sleep in my van
Posts: 918
Joined: Fri Sep 22, 2006 1:35 am
antispam: No
How many wheels are on an Astro van? (4): 4

Re: COOLANT FLUSH

Post by rlsllc » Tue Apr 13, 2010 3:01 am

Welcome Peter!

Please lose the caps lock.

IIRC, the inlet hose is the one that hooks to the intake manifold, and the return hooks to the pump on the suction side. I hope I have that right.

If you run the heater on a cold engine, you can feel the hotter hose as the engine warms, that is the inlet.

This is how I did mine, it is the only really good way if your van had Dexcool in it, IMHO. viewtopic.php?f=6&t=5199&start=0

User avatar
CaptSquid
I plan to be buried in my van
Posts: 1231
Joined: Sun Sep 10, 2006 11:50 am
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Billings, MT, 'MERICA!
Contact:

Re: COOLANT FLUSH

Post by CaptSquid » Tue Apr 13, 2010 8:22 pm

PLEASE don't use a Prestone Flush Kit. Cutting a line gives you one more place for a leak and the cold water from the household water supply will cause the t-stat to stay shut.
Mike, Billings, MT, 'MERICA!
92 Safari SLE w/Z Motor (sold to a good home)
98 AWD Stro LS
93 Suburban Silverado 4x4

Look for the MISSING Alien in the Right Seat. AL, PHONE HOME!!!

ImageImage
Image

User avatar
LaGrasta
I sleep in my van
Posts: 715
Joined: Fri Jan 19, 2007 10:07 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Mission Viejo, CA

Re: COOLANT FLUSH

Post by LaGrasta » Tue Apr 13, 2010 8:48 pm

Hey, welcome to the forum! Great people here with lot's of help. I agree, scrap the flush kit.
Just unhook each hose and jam a garden hose in and blast away, works great. If you really want to flush the whole system, unhook any and every hose and flush both forward and back. I think you'll find this cheap, easy and effective. Doing it even just once should last a long time before any need of it again.
1998 Astro, 224,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box

nsx1pete
I am merely driving my van
I am merely driving my van
Posts: 3
Joined: Fri Apr 09, 2010 3:16 pm
antispam: No
How many wheels are on an Astro van? (4): 4

Re: COOLANT FLUSH

Post by nsx1pete » Wed Apr 14, 2010 1:52 am

Thanks a lot, I will let you know how I make out.

Pete, 02 Astro

User avatar
crash
ASV Supporter
ASV Supporter
Posts: 1306
Joined: Thu Sep 21, 2006 6:18 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Woodstock, Ontario

Re: COOLANT FLUSH

Post by crash » Wed Apr 14, 2010 10:37 am

CaptSquid wrote:the cold water from the household water supply will cause the t-stat to stay shut.
stupid question perhaps.... can you pull the stat and then flush it with cold water? .. or when run, if the cold water warms up anyway .. wouldn't the stat open? :-k

curious
Rob Image

current rides:
04 Mazda 6 V6 5spd

vans owned: Image
97 Astro AWD (selling by summer .. i think) SOLD
99 Astro LS Sept 08 ASV VOM
94 Astro LT
93 Astro LT
96 Astro LT AWD * parts van*

User avatar
Smiliesafari
ASV Supporter
ASV Supporter
Posts: 2681
Joined: Sat Dec 02, 2006 8:34 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Orlando, FL

Re: COOLANT FLUSH

Post by Smiliesafari » Wed Apr 14, 2010 12:13 pm

The Capt. is correct. Cold water will keep the t-stat closed. However, if you flush through one of the heater hoses the t-stat will not affect the flush provided the heater hoses are connected to the manifold and water pump. In order to flush the radiator you will have to remove the radiator hoses.
1996 Safari SLX Hotair balloon transport vehicle

User avatar
LaGrasta
I sleep in my van
Posts: 715
Joined: Fri Jan 19, 2007 10:07 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Mission Viejo, CA

Re: COOLANT FLUSH

Post by LaGrasta » Wed Apr 14, 2010 3:06 pm

If you're doing the flush, this would be a good time to spend $5 and replace the stat anyway, good insurance.
1998 Astro, 224,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box

User avatar
kings-x59
ASV Supporter
ASV Supporter
Posts: 1378
Joined: Fri Sep 22, 2006 2:50 am
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Cypress, Tx

Re: COOLANT FLUSH

Post by kings-x59 » Thu Apr 15, 2010 3:11 am

LaGrasta wrote:If you're doing the flush, this would be a good time to spend $5 and replace the stat anyway, good insurance.
+1
'89 Astro, 4.3L, TBI. Minor intake and exhaust mods. Rebuilt 700R4 trans (by me). Corvette servo, 0.5" boost valve, police grade 1-2 accumulator spring (shifts fast and solid). B&M stacked plate trans cooler. Bilstein shocks. Belltech sway bars front and back. New head unit, speakers and subwoofer. Needs paint and a new headliner.

name's Steve
I can't remember all I've forgotten about that....

User avatar
CaptSquid
I plan to be buried in my van
Posts: 1231
Joined: Sun Sep 10, 2006 11:50 am
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Billings, MT, 'MERICA!
Contact:

Re: COOLANT FLUSH

Post by CaptSquid » Thu Apr 15, 2010 1:28 pm

crash wrote:
CaptSquid wrote:the cold water from the household water supply will cause the t-stat to stay shut.
stupid question perhaps.... can you pull the stat and then flush it with cold water? .. or when run, if the cold water warms up anyway .. wouldn't the stat open? :-k

curious
Sorry, crash, but the water flowing through the engine isn't in there long enough to get warm. I did that on a 77 DJ5 and only managed to flush part of the system. It NEVER got warm.

I went to the hardware store and got the metal hose ends and a few worm clamps. I kept them in my tools until I got rid of the old girl (the N. Charleston PD took her away because they CLAIMED I was parked illegally. They hated sailors.)
Mike, Billings, MT, 'MERICA!
92 Safari SLE w/Z Motor (sold to a good home)
98 AWD Stro LS
93 Suburban Silverado 4x4

Look for the MISSING Alien in the Right Seat. AL, PHONE HOME!!!

ImageImage
Image

Meterpig
I finally get the smurf thing
Posts: 195
Joined: Wed Dec 29, 2010 12:06 am
antispam: No
How many wheels are on an Astro van? (4): 4

Re: COOLANT FLUSH

Post by Meterpig » Wed Dec 29, 2010 3:48 am

FYI-be careful about putting 40 degree water into a 150 degree engine. Sometimes physics wins.
What do you think of my quest to swap transfer cases to the venerable BW4472?
viewtopic.php?f=58&t=9962

Photos including tear down for intake gaskets (PITA)
http://www.smugmug.com/gallery/n-xSjRG/i-bHzD6cz

User avatar
Smiliesafari
ASV Supporter
ASV Supporter
Posts: 2681
Joined: Sat Dec 02, 2006 8:34 pm
antispam: No
How many wheels are on an Astro van? (4): 4
Location: Orlando, FL

Re: COOLANT FLUSH

Post by Smiliesafari » Wed Dec 29, 2010 12:44 pm

That sounds SCARY :yikes: . Care to share the details?
1996 Safari SLX Hotair balloon transport vehicle

Post Reply