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Gates 34858 Engine Coolant Thermostat
| Brand | Gates 34858 |
|---|---|
| Outlet Outside Diameter | .61 |
| Outlet Outside Diameter | 1.34 |
| Bolt Hole Quantity | 3 |
| Type | Integrated housing thermostat |
| Jiggle Pin Weep Hole | Yes |
| Start to Open Temperature | 172 |
| Start to Open Temperature | 78 |
| Outlet Inside Diameter | .42 |
| Outlet Inside Diameter | 1.08 |
| Electric | No |
| 9841 | 1 |
| Check Valve | No |
| Electric | No |
| Jiggle Pin/Check Valve | Yes |
| Number of Bolt Holes | 3 |
| Number of Jiggle Pins/Check Valves | 1 |
| Number of Seals | 1 |
| OE Comparison Rating | Oe performance |
| OE Exact | No |
| Outlet Inside Diameter 1 (in) | 1.08 |
| Outlet Inside Diameter 2 (in) | .42 |
| Outlet Outside Diameter 1 (in) | 1.34 |
| Outlet Outside Diameter 2 (in) | .61 |
| Temperature (C) | 78 |
| Product line | Integrated Housing Thermostat |
| Fits | Acura · 14 vehicles |
Integrated housing thermostat. Combines thermostat and housing for a cleaner, simpler cooling-system repair.
OE performance. Built as an aftermarket alternative with accurate temperature regulation.
Jiggle pin weep hole. Helps purge trapped air for steadier coolant flow and control.
Cross-references Dayco 95172, Dorman - OE Solutions 902-5953 and Dorman - OE Solutions 951-172 for the same application. See all 4.
Integrated thermostat housing for OE temperature control
Gates 34858 is an integrated housing thermostat built for accurate engine coolant temperature regulation. It follows OE-style temperature control with a 172 degree start-to-open rating and includes a seal for service replacement on select Acura applications.
Key features
- Integrated Housing Thermostat design for modern cooling systems
- Start to open temperature: 172°F (78°C)
- OE Performance comparison rating
- Jiggle pin weep hole and jiggle pin/check valve: Yes
- 3 bolt holes for mounting
- Electric: No
- Single seal included
- Outlet dimensions: 1.34 in and 0.61 in outside diameter; 1.08 in and 0.42 in inside diameter
Product details
Gates Integrated Housing Thermostat 34858 is engineered for vehicles that use a thermostat and housing assembly in one unit. Gates applies its cooling-system research to aftermarket thermostat solutions that match OE-style temperature regulation, helping maintain proper coolant flow and operating temperature. This part cross-references Dayco 95172 and Dorman - OE Solutions 902-5953 for the same application.
Vehicle fitment
- Fits 2016-2020 Acura MDX, N/A — 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat
- Fits 2019-2020 Acura RLX, N/A — 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat
- Fits 2015-2020 Acura TLX, N/A — 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat
- Fits 2018 Acura RLX, N/A — W/10-Speed Auto. Trans.; 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat
Common issues this part addresses
- Engine running too cool or too hot from a worn thermostat
- Coolant temperature instability during normal driving
- Leak points at an aging thermostat housing assembly
- Delayed warm-up caused by a thermostat that no longer opens at the correct temperature
- Service issues on Acura MDX, Acura RLX, and Acura TLX cooling systems
Installation notes and quality assurance
Verify the OE temperature specification, outlet dimensions, and bolt-hole count before installation. Clean the sealing surfaces thoroughly and inspect the cooling system for contamination or trapped air after service. Gates backs this thermostat housing line with OE-focused engineering and aftermarket coverage for integrated housing applications.
| Year | Make | Model | Transmission | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2020 | Acura | MDX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2020 | Acura | RLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2020 | Acura | TLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2019 | Acura | MDX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2019 | Acura | RLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2019 | Acura | TLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2018 | Acura | MDX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2018 | Acura | RLX | Automatic | 3.5L | V6 | GAS | N/A | W/10-Speed Auto. Trans.; 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2018 | Acura | TLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2017 | Acura | MDX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2017 | Acura | TLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2016 | Acura | MDX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2016 | Acura | TLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 2015 | Acura | TLX | — | 3.5L | V6 | GAS | N/A | 172 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
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