Cadillac Radiator Coolant Overflow Bottle - 1AROB00207


  • Radiator Overflow Bottle
  • Commonly called "Coolant Overflow Tank or Reservoir, Surge Tank or Expansion Tank"
  • Plastic construction
  • Direct replacement
  • Built to strict quality control standards

Item Condition: New

WARNING: Cancer and Reproductive Harm -

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Remove the battery (1:05)
    • Flip up the plastic cover
    • Remove the five 13 mm bolts securing the panel covering the battery.
    • Disconnect the NEGATIVE battery cable first.
    • Then disconnect the positive terminal.
    • Use a socket and extension to remove the 13 mm mounting bolt.
    • Pull the batter up and out of the engine bay.
  2. step : Remove the radiator coolant tank (2:57)
    • Use a flat blade screwdriver to disconnect the hose.
    • Remove the two 8 mm bolts and the 10 mm bolt.
    • Remove the bracket secured by the 10 mm bolt and set aside.
    • Disconnect the lead and the larger hose.
    • Place a catch pan under the vehicle, because when you remove the lower hose it will drain.
    • Remove the radiator fluid bottle.
  3. step : Install the new radiator fluid bottle. (7:00)
    • Hook up the lower hose and secure the clamp with a flat blade screwdriver.
    • Bolt the bottle down with your 8 and 10 mm socket.
    • Plug in the lead.
    • Connect the upper hose, tightening the clamp with your screwdriver.
    • Fill the radiator fluid reservoir up to the fill line with radiator coolant.
  4. step : Reinstall the battery (9:47)
    • Position the battery into place and bolt down the 13 mm mounting bolt.
    • Connect the positive battery terminal.
    • Then connect the negative battery terminal with your 8 mm wrench.
    • Bolt down the panel with the five 13 mm bolts.

Tools needed for replacement:

    Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket
  • 13mm Socket
  • 8mm Socket

3.2 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
A reservoir tank for my 1998 Cadillac
They were quick to ship and ya da great YouTube video with step by step directions. However, the part didn’t have matching bolts and after installing i found the sensor was bad. They refunded my money back and therefore i appreciate their business. Maybe next time the part will be an exact replacement.
August 12, 2018
2 months ago
Meets the minimum requirements.
The part fits perfectly and meets the minimum needs, such as holding coolant. However, the coolant monitor does not function properly. It's kind of a pain to put in, so it wasn't worth pulling to put in different unit with a working monitor.
August 6, 2018
3 months ago
Response from 1A Auto
Thank you for leaving a review for the coolant overflow bottle you purchased! Your part is covered by a lifetime warranty, so if you feel the part has failed to to manufacturing defects you are eligible for a replacement. If you wish to get a warranty replacement please contact our customer service department for assistance. Our contact info can be found on our website! - 1A Auto
August 7, 2018
Tim K
Easy fix for cracked plastic bottle
Quick delivery. Well made. Perfect fit, I did have to remove the nut plates and reuse the nut plates from the old leaking bottle. Due to the new nut plates being for a larger bolt.
Also did not use the pressure cap since the stamped writing on it was in German.
May 19, 2018
4 months ago
Not great.
Upon inspection, everything looked correct however once installation began, i found that the o.e. a/c bracket did not fit into the new grooves on the new tank. After installing the tank and filling the system, my car kept giving me a "check coolant level" message on my dashboard. I checked the fluid and found out was full. Now it stays on all the time even though the tank is full. That's the risk taken when ordering online.
May 3, 2018
5 months ago
On time, in great shape
The product was as advertised and more importantly was the how to video for it! I will definitely shop with 1A Auto again
July 24, 2017
1 year ago
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Browse 1 question Browse 1 question and 8 answers
Is the cap included?
Meagan on May 24, 2018
BEST ANSWER: Yes it is. I want to mention the water level switch for me is working in reverse. It might just have been my car 2000 Eldorado when the bottle is full the circuit is complete so I had to put a jumper wire in the end of the connector so the low coolant level warning would go out.

Vehicle Fit

Year Make Model Description
1994-1999Cadillac Concours Cadillac Concours Radiator Coolant Overflow Bottle
1996-1999Cadillac Deville Cadillac Deville Radiator Coolant Overflow Bottle
1994-2002Cadillac Eldorado Cadillac Eldorado Radiator Coolant Overflow Bottle
1993Cadillac Seville Cadillac Seville Radiator Coolant Overflow Bottle V8 4.6L (8th Vin Digit 9)
1994-1997Cadillac Seville Cadillac Seville Radiator Coolant Overflow Bottle

This part replaces:

  • Dorman 603-133
  • Hollander 671-00101
  • OE # 19129961
Part #: 1AROB00207

Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

How-to Video:

(11:54 min)