The 2018 Freightliner 108SD has 3 electrical switch & relay parts with verified fitment on this page — 1 part type and 1 brand, covering the 6.7L L6 DIESEL Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2018 Freightliner 108SD, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. Every listed part is A/C Refrigerant Pressure Switch.
Every part on this page is matched to the 6.7L L6 DIESEL Turbocharged — the only engine offered in the 2018 Freightliner 108SD.
Every electrical switch & relay part listed for the 2018 Freightliner 108SD comes from UAC.
Each part number listed for the 2018 Freightliner 108SD opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC | SW11204C | 🇺🇸 US 🇨🇦 CA | Binary Hpco/Lpco Switch | View on Amazon |
| UAC | SW11280C | 🇺🇸 US 🇨🇦 CA | Binary HPCO/Cooling Fan Pressure Switch | View on Amazon |
| UAC | SW11189C | 🇺🇸 US 🇨🇦 CA | HPCO Switch | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 A/C Refrigerant Pressure Switch parts for the 2018 Freightliner 108SD come from UAC.
This group includes UAC SW11204C, UAC SW11280C and UAC SW11189C.
Buying Electrical Switch & Relay Parts for a 2018 Freightliner 108SD
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 6.7L L6 DIESEL Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2018 Freightliner 108SD?
Our catalog currently lists 3 electrical switch & relay parts for the 2018 Freightliner 108SD across 1 subcategory and 1 brand, covering the 6.7L L6 DIESEL Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2018 Freightliner 108SD?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Freightliner 108SD was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Freightliner 108SD?
Every part on this page is matched to the 6.7L L6 DIESEL Turbocharged engine. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Freightliner 108SD
Electrical Switch & Relay Parts for Other Freightliner 108SD Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.