1989 rad expansion reservoir, what type of plastic? DIY plastic
![](http://www.bimmerworld.com/BMW-17117639022-17-11-7-639-022-SF-Rein-Automotive-OEM-Expansion-Tank-Cap-1.jpg)
Rein Expansion Tank Cap for BMW E30 E36 E34 E39 E32 E38 E31 Z3 M50 M62 S52
Prevent catastrophy by replacing your aged, fragile plastic tank with a high-quality, long-lasting aluminum tank
![](http://www.bimmerworld.com/BMW-E46-325i-325ci-330i-330ci-328i-323i-non-M-Aluminum-Expansion-Tank-Moroso-27483-1.jpg)
E46 323i/325i/328i/330i Aluminum Expansion Tank by Moroso
What is a coolant reservoir in a car? - Quora
![](https://ae01.alicdn.com/kf/S053529b77bc1490ead3f2a3870f38f89R.jpg_640x640Q90.jpg_.webp)
Larbll Car Coolant Overflow Reservoir Water Tank Mb605260 Fit For Mitsubishi Montero Pick - Up - Thermostats & Parts - AliExpress
![](https://www.jegs.com/images/photos/500/555/555-78018.jpg)
JEGS 555-78018 17-Gallon Fuel Tank - C10 Fuel Tank for 1960-1966 Chevrolet Truck - JEGS - JEGS
![](https://www.mdpi.com/materials/materials-15-04215/article_deploy/html/images/materials-15-04215-g001.png)
Materials, Free Full-Text
![](https://intrepidoverland.com/wp-content/uploads/2020/02/IMG_3729-scaled.jpg)
My DIY Coolant Tank
![](https://haynes.com/en-gb/sites/default/files/styles/opengraph/public/web_Guide%20to%20cooling%20systems_header.jpg?itok=grL-nqHG)
Understanding your car's cooling system
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Toxics, Free Full-Text