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Heating and Cooling› Overflow Tanks and Catch Cans

Rein

Engine Coolant Expansion Tank

$251.93 $68.99 Save $182.94

SKU: EPT0188

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$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The Rein Automotive EPT0188 is an engine coolant expansion tank designed to hold excess coolant. It allows for the expansion and contraction of coolant as the engine heats and cools. This reservoir is often positioned at the highest point in the cooling system to allow air to escape and coolant to be added without introducing air.
Show original supplier description
The Rein Automotive EPT0188 is an engine coolant expansion tank, also known as a coolant reservoir, that plays a crucial role in maintaining your vehicle's cooling system integrity. This component holds excess coolant, accommodating the natural expansion and contraction of the fluid as it heats up and cools down. Its strategic placement, often at the highest point in the system, facilitates the venting of trapped air while allowing for the addition of coolant without introducing air pockets. Detecting a faulty expansion tank is important, as a compromised unit can lead to cooling system overflows, a lowered coolant boiling point, and potential engine overheating. Signs of failure include steam or coolant leaks from the tank. A loose or faulty expansion tank cap can sometimes mimic expansion tank pressure issues, so checking the cap is a recommended first step. This Rein EPT0188 is designed as a direct replacement, ensuring OE quality and straightforward installation. It is compatible with select Porsche Cayenne and Volkswagen Touareg models, specifically the 2011-2018 Porsche Cayenne (including 3.6 V6 and 4.8 V8 engines) and the 2011-2017 Volkswagen Touareg (including Hybrid, TDI, TDI Executive, TDI Lux, and TDI R-Line trims).

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandRein
Part NumberEPT0188
CategoryHeating and Cooling

Videos

Mercedes Expansion Tank Replacement Rein/Pensosin - Simple DIY (CLK550)

Mercedes Expansion Tank Replacement Rein/Pensosin - Simple DIY (CLK550)

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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