Keep coolant cycling at the right temperature with the MOTORAD engine coolant thermostat (MRD105), a Spec-R thermostat designed and built by an OE thermostat supplier for high-performance and racing use. It drops in as a direct-fit replacement for many vehicles, including the 2007-2013 Chevrolet Silverado 1500 [V8-5.3L], 2007-2013 GMC Sierra 1500 [V8-6.0L], and 2007-2014 Chevrolet Tahoe [V8-5.3L] — see the Buyer's Guide tab for the full list of applications and engines (L6-3.0L, V6-4.3L, V8-4.2L, V8-4.8L, V8-5.3L, V8-5.5L, V8-6.0L, V8-6.2L, V8-6.6L, V8-7.0L).
The thermostat regulates coolant flow between the engine and radiator to hold a stable operating temperature. If a stuck thermostat is behind overheating, an engine that never reaches temperature, or fluctuating gauge readings, this replaces it. Country of origin: Israel.
This part cross-references / interchanges with the following part numbers:
What is the MOTORAD MRD105?
It's a MOTORAD thermostat from the Spec-R line, built to regulate coolant flow between the engine and radiator and hold a stable operating temperature.
What temperature does this thermostat open at?
It opens at approximately 160°F (about 71°C), a lower-than-OE setting the manufacturer offers for cooler engine operation.
Does the MRD105 come with a seal?
Yes. It ships with a rubber O-ring seal already pre-installed, and it has a jiggle-pin weep hole to let trapped air escape during fill.
Does this include a MOTORAD thermostat housing?
No — the MRD105 is the thermostat with its pre-installed seal, not a MOTORAD thermostat housing. Consult the vehicle service information on whether the existing housing may be reused.
How do I confirm fitment or find a MOTORAD thermostat cross reference?
Enter your year, make, model and engine in the Buyer's Guide tab, or match part number MRD105 to confirm this thermostat fits your vehicle.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
