Thermostat Assembly for Opel Vauxhall 3639916

Product Overview

Thermostat Assembly for Opel Vauxhall 3639916 is a direct-reference replacement for the coolant control circuit of Opel vehicles. It is listed here against OEM 3639916, so the part can be matched to a vehicle without guesswork. The coolant control circuit gives this part a hard life: heat soak, vibration and pressure cycling. Typical end-of-life signs are seals that take a set after repeated heat cycles and cracked plastic housings, which reach the workshop as a gauge that never settles in the normal band, higher fuel consumption and thermostat fault codes. We hold it as part of a cooling-system range of more than 4000 types built for the independent aftermarket in Europe, the Middle East and South America.

The source photograph for this reference is low resolution. A higher-resolution image can be sent by email on request.

Key Benefits

• Built for the duty of the coolant control circuit — The part carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up, so the compound and the wall construction are matched to that circuit rather than to a generic hose spec.
• Aftermarket buyers, not one-off retail — Pricing and packing are set up for distributors and workshop chains buying by the carton, not for single-piece retail.
• Ordered by reference not by photo — The listing carries OEM 3639916. You quote the number, we confirm against the same number, and the part that ships is the one on the invoice.
• Mixed pallets instead of single lines — A cooling-system range of more than 4000 types means a slow-moving line can travel with fast movers instead of being ordered on its own.

Application Scenarios

Breakdown repair

The vehicle is off the road and the part has to be right the first time, which makes the reference match the whole decision. This reference, 3639916, is bought for exactly that situation on Opel vehicles.

Rebuild of an obsolete platform

The original reference is no longer produced, so the part is made from a supplied sample. For 3639916 the practical step is confirming the opening temperature, the housing outline and whether the unit is map-controlled before the order is placed.

Mixed container for a distributor

A quarterly container is filled across families — intake, charge air, coolant and thermostat lines — to a single packing list. This reference, 3639916, is bought for exactly that situation on Opel vehicles.

Who It Is For

• Online parts sellers — listing by OEM reference, where a mismatched number turns into a return and a negative rating. For them 3639916 is a line on a shelf, not a project.
• Fleet and bus operators — running Opel vehicles past warranty and buying cooling-system parts by the box to keep downtime short. What they need from 3639916 is that it fits the Opel on the ramp today.
• Radiator and cooling specialists — rebuilding cooling systems and sourcing the hoses, flanges and housings for a platform in one go. They judge 3639916 on one thing: whether it matches the part that came off.

Problems It Solves

Reference mismatch

Visually identical parts carry different connector geometry between model years. Quoting OEM 3639916 fixes the identity before money moves. For Opel buyers it is the difference between a stocked line and a credit note on 3639916.

Split ordering

Sourcing one hose from one supplier and the matching flange from another doubles the freight and the paperwork for the same repair. On 3639916 that is settled before the quotation goes out.

Parts that are no longer produced

When the original reference is dropped, the repair still exists. Sample-based production and mould development keep the line alive. On 3639916 that is settled before the quotation goes out.

Technical Features

The part serves the coolant control circuit and carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up. Material for this reference is confirmed per enquiry. The listed opening temperature is 97/105°C, which is the figure that has to match the vehicle.

Matched to the circuit the part serves. Confirm the compound against the reference before ordering, because visually identical parts are moulded in different materials.

Specifications

Values marked TBC are not stated on the source catalogue. They are confirmed in writing on the quotation rather than estimated here.

Comparison With the Alternatives

Use Guide

1. Confirm the reference

   Match OEM 3639916 against the number on the part you removed. Do not match on outline alone.

2. Check the interfaces

   Compare the opening temperature, the housing outline and whether the unit is map-controlled before the vehicle is stripped further.

3. Inspect on arrival

   Look for transit damage on sealing faces and connectors. Confirm the compound against the reference before ordering, because visually identical parts are moulded in different materials.

4. Fit with the original clamp style

   Reuse the clamp type the Opel platform was designed around, and fit any seal or O-ring supplied with 3639916 rather than carrying the old one over.

5. Pressure check before handover

   Refill, bleed the circuit and check for cracked plastic housings at working temperature before the vehicle leaves.