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Old 10-06-2014, 12:50 PM   #1
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Surge (Coolant) Tank Replacement

Have any of you personally replaced the surge tank in a 2005 / 2007 Fleetwood 39V DP with the Cat 330 ? This is a rear radiator with the surge tank mounted on top of the radiator and located on the right side . If so will you post or send to me the basic instructions on how you reached the nuts/bolts and hose clamps. Can the rear of the tank be reached from the floor access plate ? I have the new tank and am ready to install it, but can not see a reasonable way to reach everything. Any help will be appreciated.

2007 Fleetwood Discovery 330 Cat engine, rear radiator

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Old 10-09-2014, 01:19 AM   #2
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Surge tank replacement

The job is done. Replacement of the tank was a six hour job for one person. Two workers and a 24" 9/16 wrench would have cut the time in half. All work was done from the rear of the coach. There is no access from the bedroom. Sure beats the $ 880.00 labor estimate from the dealer. The original tank is brittle and had started to crumble.

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Old 10-09-2014, 09:23 AM   #3
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Good show! I was going to point you to some other discussions about changing tanks on a Freightliner rear radiator chassis, but I was too late.
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Old 02-09-2015, 04:10 PM   #4
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Wow! Furniss, you did it all from the rear ? Prayer tell , What do you have to remove , or what should I remove to get all four bolts? I just found a source for my surge tank and sensor in Tucson. I hope to have it next week.
2003 Fleetwood Discovery 38U
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Old 02-09-2015, 04:46 PM   #5
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Canyon Country located at 1680 W. Acoma Blvd, Lake Havasu City, Az Builds Recovery Tank for the Radiator.
Friend of mine had his replaced FL chassis, read rad, CAT 3126E. Same style.
About $400 give or take - cannot remember the correct cost.
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Old 02-09-2015, 05:34 PM   #6
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Well I had to change the tank, outside San Fran, on our last cross country trip. Look at the tank, 4 bolts, piece of cake??? Right? Wrong!!! It took my son and I a few hours and a few new curse words to do the job. The main problem ya can't get to the bolts from here, there or anywhere. I now have a sun shade covering the new tank so it shouldn't crack again.
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Old 02-09-2015, 06:16 PM   #7
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Surge tank replacement

Reply to posts #4 &# 6 . Since I was working by myself I had no way to reach both the bolts and nuts that secure the tank. If you have a helper one person can work from below and reach the nuts with a long wrench or possibly an extension with a flop socket, the other person can reach the bolts. As I was working by myself I used a Dremel tool with a plastic cutting blade to cut the tank into thirds . The tank was crumbling from the inside out. If I were to do another replacement I would try using a pneumatic (air) saw and 10 to 12" blade. The tank was purchased from a Freightliner dealer for $ 125.00 who had it in stock. As to installing a sun shade , In my case I don't think it will help . My tank had more damage in the rear ( covered section ) and inside the tank ( baffles ) than on the front (exposed side ) . It appeared that the plastic was drying out and starting to crumble. The outer skin did not look bad until I looked at it in the dark using a bright flashlight, Then I could see the cracks. One more trip and I probably would have changed tanks on the side of the road. When I installed the new tank I used 3/8" speed nuts purchased at our local hardware store . It sure made the job easier, plus if I have to replace the tank again it will be a one person job.
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Old 02-10-2015, 10:27 AM   #8
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Thanks for the info . I just put a new tank and sensor on hold at Frieghtliner, Chandler, AZ. $135 plus tax. Guess all I need is a Dremel with cutting disks, speed nuts, worm gear type hose clamp, and anti-freeze.
2003 Fleetwood Discovery 38U
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Old 02-16-2015, 08:47 PM   #9
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Surge Tank Replacement & coolant level sensor / 2003 Fleetwood Discovery 330HP CAT /

The replacement went easier than I thought. Total cost $165, time spent about six hours, over four days, from siphon to test drive. My neighbors weren't too happy because I did the work in the front yard Getting to those two hidden bolts curb side just took a 9/16" Metrinch socket, and an open end wrench. Other items needed; piers, heavy duty flat head screw-driver, new hose clamps. If you have to replace yours then definitely invest in two speed-nuts.

Here are some pictures of the job:

< https://www.dropbox.com/sh/c1o9a5fqa...sS4WdIsxa?dl=0 >
2003 Fleetwood Discovery 38U
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Old 06-29-2015, 11:51 AM   #10
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Any part numbers readily available for the tank mentioned ?
2002 Itasca Horizon 34HD
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Old 06-29-2015, 10:33 PM   #11
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item # from Freightliner for my surge tank was 004F/05-17750-001.
2003 Fleetwood Discovery 38U
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Old 12-21-2016, 05:49 PM   #12
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I just replaced the surge tank on my 03 Discovery. I went a lot easier than I expected. I was able to access everything from the bedroom closet. I drilled a 1/2" hole in the deeper part of the tank and inserted a 1/2" diameter hose through the hole. I was then able to siphon almost all of the antifreeze out. With the aid of a ratcheting box wrench I was even able to get the bolts out on the side of the tank. I did use the recommended clip nuts for the install. It went from opening up the compartment to finish product in just over two hours. I feel very lucky that everything went so smoothly.
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Old 09-12-2017, 10:15 AM   #13
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In regards to a replacement surge tank:

Does anyone have any opinion about the Freightliner tank vs. the Sterling exact replacement available at FindItParts? The difference in price is minimal, I'd just like to get a tank that may be 'improved' over the original FL design, if possible.

Has anyone heard or have an opinion on whether the Sterling is an improvement, or did FL actually improve their own design for the tank? And I'm talking about the crumbling plastics used that rot over time, and I'm hoping to find that these tanks no longer crumble apart. Is Sterling a good brand? Or should I stick with FL and hope for the best?

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Old 01-25-2018, 07:43 PM   #14
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Cummins surge tank

I have a weeping radiator surge tank that I will be replacing. The part number is 05-17750-002. It is the same as 05-17750-000 and 05-17750-001. I have been reading about replacing the tank and subsequent failures. What I am looking for is the metal replacement tank. I have seen references to VML-T3495 as that replacement. If the pictures are correct, it is a round tank and looks nothing like the current plastic tank. So, does anyone know the metal replacement tank number for the plastic 05-17750-002.

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replacement, replace, tank

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