Coolant Thermostat Housing Assembly for Volvo 30725119

Product Overview

A Thermostat Housing Assembly for Volvo vehicles, held against OEM 30725119, 30757523 and 30735589. In service the part carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up. In service the part carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up. When it fails it usually shows leaking sensor bosses and elements that stick part open, and the driver sees a gauge that never settles in the normal band, higher fuel consumption and thermostat fault codes. The part belongs to a cooling-system catalogue of more than 4000 types, which is the practical reason buyers consolidate a mixed pallet with us rather than splitting it across suppliers.

Key Benefits

• Inspection before despatch — Parts are inspected before they leave, which for this family means checking the sealing faces and the connector geometry that decide whether it fits.
• Matched to how the part actually fails — Leaking sensor bosses and elements that stick part open are the reasons this reference is bought, so those are the features checked before packing.
• 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.
• One reference set on every document — OEM 30725119, 30757523 and 30735589 appears on the quotation, the packing list and the carton label, so a warehouse can check a delivery without opening the box.

Application Scenarios

Rebuild of an obsolete platform

The original reference is no longer produced, so the part is made from a supplied sample. This reference, 30725119, is bought for exactly that situation on Volvo vehicles.

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, 30725119, is bought for exactly that situation on Volvo vehicles.

Scheduled cooling-system overhaul

The vehicle is in for a coolant leak and the workshop replaces the whole branch at once rather than chasing the next failure in a month. On this reference that means quoting 30725119 with the quantity and letting the packing follow.

Who It Is For

• Workshop and fast-fit chains — replacing thermostat housing assemblys on Volvo daily and judging a supplier on whether the part fits first time. They judge 30725119 on one thing: whether it matches the part that came off.
• Online parts sellers — listing by OEM reference, where a mismatched number turns into a return and a negative rating. They order 30725119 by the carton and reorder against the same number.
• Fleet and bus operators — running Volvo vehicles past warranty and buying cooling-system parts by the box to keep downtime short. They judge 30725119 on one thing: whether it matches the part that came off.

Problems It Solves

Returns from wrong fitment

Every returned part costs the freight twice. Checking the opening temperature, the housing outline and whether the unit is map-controlled before despatch is cheaper than a credit note. That is why 30725119 carries its full cross-reference set on this page.

Long lead times on slow movers

A slow line ordered alone waits for a container. Consolidated with fast movers it travels on the same shipment. With 30725119 the check is the opening temperature, the housing outline and whether the unit is map-controlled, and it happens before despatch.

Unclear compound

Confirm the compound against the reference before ordering, because visually identical parts are moulded in different materials. For this thermostat housing assembly the answer is the reference, 30725119, on every document.

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 83°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 30725119, 30757523 and 30735589 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 Volvo platform was designed around, and fit any seal or O-ring supplied with 30725119 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.