The Dometic expansion valve is a critical component in your RV's air conditioning system that regulates refrigerant flow to maintain optimal cooling performance. This OEM replacement valve is designed specifically for Dometic CF Series cooling units and works with 404A refrigerant. If your RV AC is running inefficiently, not cooling properly, or you're experiencing temperature fluctuations, a faulty expansion valve is often the culprit.
Key Features
- OEM Dometic replacement part for CF Series air conditioning systems
- Compatible with 404A refrigerant specifications
- Precise refrigerant metering for consistent cooling performance
- Direct factory replacement—no modifications needed
- Genuine part ensures warranty protection and system reliability
Technical Specifications
| Specification | Details |
|---|---|
| Part Number | 290336057 |
| Refrigerant Type | 404A |
| System Compatibility | Dometic CF Series |
| Type | Thermostatic Expansion Valve |
Frequently Asked Questions
How do I know if my expansion valve needs replacement?
Signs of a failing expansion valve include weak or no cooling output, ice buildup on refrigerant lines, inconsistent temperature control, or hissing sounds from the AC unit. If your Dometic CF Series AC isn't performing as it should, the expansion valve is worth inspecting.
Can I install this expansion valve myself?
Expansion valve replacement requires refrigerant recovery and system evacuation, which typically requires EPA certification and specialized equipment. We recommend having a qualified RV technician handle the installation to ensure proper system operation and warranty compliance.
Is this a genuine Dometic OEM part?
Yes, this is an authentic OEM Dometic part. Using genuine replacement components ensures your cooling system operates at factory specifications and maintains your warranty coverage.
Why Elkhart RV Parts
We specialize in hard-to-find Dometic RV replacement parts and ship directly from Elkhart, Indiana—the RV capital of the world. Every part we sell is genuine OEM equipment backed by expert support to help you get your RV back on the road quickly and confidently.
| Brand | Dometic |
|---|---|
| Part number | 290336057 |
| Product type | Expansion Valve |
| Refrigerant type | 404A |
| Compatibility | Dometic CF Series (CF150, CF250, CF3106, CF3500) |
| Valve size | 1/4" x 3" |
| Capacity | 1/6 ton |
| Superheat setting | 10 degrees |
| Features | Equalizer cap |
| Installation type | OEM replacement |
| Condition | New |
| Category | Service Parts |
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.