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SKU:
NLT2T03472
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Water Temperature Sender for Perkins 402D, 403D & 404D Engines – 385720500
$45.99
In Stock
$45.99
Sale price
$45.99
Regular price
This water temperature sender monitors coolant temperature on Perkins 400-series diesel engines that use part number 385720500.
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
| Perkins engines | 402D-05 |
|---|---|
| 403D-07 | |
| 403D-11 | |
| 403D-15 | |
| 403D-15T | |
| 404D-15 | |
| 404D-22 | |
| 404D-22T | |
| Additional families listed by Perkins parts suppliers | 403C and 404C variants that use 385720500 |
Product Overview
Part 385720500 is a coolant-temperature sender/switch used across multiple Perkins 402D, 403D and 404D engine variants. It provides the temperature signal used by the engine's warning or monitoring circuit, making it an important diagnostic part when a gauge reads incorrectly, a temperature warning behaves erratically, or the original sender is damaged or corroded.
Perkins service data identifies this sender in the 400D family and publishes an M16 x 1.5 threaded body. The sender resistance decreases as coolant temperature rises, while the switch portion is specified around the high-temperature warning range.
Key Features & Performance
- Engine-specific coolant temperature monitoring
- M16 x 1.5 threaded sender configuration documented for Perkins 400D applications
- Useful replacement for inaccurate, intermittent or failed temperature indication
- Broad Perkins 400-series application coverage beyond the three models in the original title
Part Numbers & Specifications
- Part number: 385720500
- Thread: M16 x 1.5
- Sender resistance (Perkins service data): approximately 46.9–55.5 ohms at 90°C; 35.5–41.5 ohms at 100°C
- High-temperature switch specification: approximately 112°C ±4°C
Before You Order
Verify the engine build list/serial number because Perkins 400-series engines can use different senders and harness arrangements. Do not diagnose overheating from the sender alone—confirm actual coolant temperature and cooling-system condition.
Frequently Asked Questions
Is 385720500 only for the 402D-05 and 403D-15?
No. Parts and service data show the number across several 402D, 403D and 404D variants.
Can a bad sender cause an overheating warning?
Yes, a failed sender or poor electrical connection can produce an incorrect warning, but a real cooling-system problem must be ruled out before replacing parts.
What should I match before ordering?
Match 385720500, the threaded connection, terminal arrangement and your Perkins engine model/build number.