Application boundary
Engine code, opening specification and housing style must be resolved before a proposed part is treated as relevant.
Corolla cooling system · procurement guide
Toyota Corolla Thermostats
Record the engine, opening specification and whether the thermostat is separate from or integrated into the coolant inlet housing.
engine codeInstalled positionPhysical interfaceQuantity & packing
Scoped reference: 90916-A3003Unbranded technical artwork; not exact Toyota, Corolla or OE fitment proof.
Quote definition
Define the thermostats before comparing supply options
This page does not publish a universal OE number. It converts the buyer task into vehicle, part, commercial and packing evidence that can be checked in writing.
Interface evidence
Record diameter, flange, jiggle valve, seal and integrated housing; connector or mounting similarity alone is not enough.
Assembly scope
Write the request as thermostat element or complete inlet/housing assembly, with included hardware and seals stated separately.
Transit control
Keep seals paired to the correct thermostat and label temperature specifications by line.
Scoped OE evidence
Public reference example: 90916-A3003
Engine coolant thermostat. Public catalog evidence associates this thermostat with selected Corolla applications across limited 1999–2019 year and engine branches.
Reference90916-A3003
Application boundary
Public catalog evidence associates this thermostat with selected Corolla applications across limited 1999–2019 year and engine branches. This is an identification lead, not universal Corolla fitment.
Source and limitation
Review the public catalog record (accessed 2 August 2026). POPXA does not claim stock, genuine supply, every-market fitment or a complete supersession chain.
Decision record
Six checks for a quote-ready thermostats line
| Decision point | Evidence to send |
|---|---|
| Vehicle branch | Record the Corolla generation, chassis/model code, production month, body style and destination market before comparing thermostats. |
| System application | Confirm engine code, opening specification and housing style; a sales name or nominal model year does not resolve this branch. |
| Physical interface | Compare diameter, flange, jiggle valve, seal and integrated housing, using clear installed and removed-part photos wherever possible. |
| Requested assembly | State whether the line covers thermostat element or complete inlet/housing assembly; reconcile every supplier photo with a written contents list. |
| Commercial basis | Give quantity per SKU, trial or repeat demand, destination port, preferred Incoterm and any inspection-document requirement. |
| Packing control | Keep seals paired to the correct thermostat and label temperature specifications by line. |
Part-specific risk
Opening specification matters as much as physical diameter
For Corolla thermostats, the controlling difference can be diameter, flange, jiggle valve, seal and integrated housing. Keep every proposed part tied to the vehicle record and installed component; a broad year-range cross reference is not approval evidence.
Parent and sibling routes
Continue through Corolla cooling system
All Cooling System
Return to the complete system directory and identification guidance.
Open directory →Corolla Generation Guide
Resolve generation, body, powertrain, production and market evidence before part matching.
Check the vehicle →Radiator Fan Assemblies
Review fan count, shroud, motor and control arrangement and the required physical evidence.
View guide →Coolant Reservoirs
Review bottle shape, cap system and hose routing and the required physical evidence.
View guide →Buyer FAQ
Corolla thermostats questions
Which vehicle details separate Corolla thermostats applications?
Start with generation, chassis/model code and production month, then resolve engine code, opening specification and housing style. That branch is more useful than model year alone.
What physical evidence is useful for thermostats?
Photograph the installed position, label and mounting or connector faces, then record diameter, flange, jiggle valve, seal and integrated housing. Keep every measurement tied to the same removed component.
How should the thermostats assembly scope be written?
State thermostat element or complete inlet/housing assembly. List seals, brackets, motors, modules, hardware or paired sides separately so quotations can be compared on the same contents.
What packing point matters for thermostats?
Keep seals paired to the correct thermostat and label temperature specifications by line.
Does 90916-A3003 fit every Toyota Corolla?
No. It is a scoped public catalog example. Confirm the VIN or chassis/model code, production date and installed component before quotation.
Corolla parts RFQ
Send the part evidence.
Include the generation or year, engine or hybrid version, OE/reference numbers, quantities, destination and packing request. Attach a spreadsheet or old-part photos when useful.
Email
sales@popxa.com
sales@popxa.com
WhatsApp / WeChat
+86 188 3743 1505
+86 188 3743 1505
- Application and reference evidence reviewed before quotation
- Product grade, included scope and packing stated in writing
- Freight basis discussed from quantity and destination—not assumed online