Navajo Nation Fleet Management - TCSC

04/06/2026

US 160 resurfacing in Tuba City area starting today April 6

The Arizona Department of Transportation (ADOT) will begin work this week of April 6–10 to improve a 14‑mile stretch of US 160 in and east of Tuba City (mileposts 321–335). Drivers should expect delays and allow extra travel time during resurfacing, guardrail and drainage upgrades.

In Tuba City, work on multi‑lane sections is scheduled from 9 a.m. to 4 p.m. Monday through Thursday and Friday mornings until noon, with lane closures and traffic shifts. On two‑lane sections east of Tuba City, flag crews and a pilot vehicle will direct traffic from 5 a.m. to 6 p.m. Monday through Thursday and Friday mornings until noon.

ADOT is completing the $20.5 million project in partnership with the Navajo Nation and Hopi Tribe. Construction is expected to be finished in fall 2026.

More information is available at azdot.gov/US160Improvements and AZ511.gov.

03/31/2026

Asian vehicles require specific, silicate free coolants. Matching the correct type helps prevent damage and costly cooling system issues.

03/25/2026

GOOD MAINTENANCE PRACTICES
While many of your vehicle’s powertrain components, such as the driveshaft and axle shafts, do not require much routine maintenance, there are a few parts that need periodic attention:

Check the engine oil level at every fuel fill and add oil if necessary.

About once a month, make sure all tires are inflated properly and check for any unusual wear or damage.

Have an underbody flushing performed approximately once a year.

The engine's exterior should be cleaned periodically. Buildup of oil and dirt can cause the engine to run hot or hide leaks.

Have your vehicle inspected as soon as possible if the 'Service Engine Soon' light illuminates.

Have your vehicle inspected immediately if the 'Service Engine Soon' light flashes rapidly. This indicates an engine misfire condition which may damage your engine and/or engine emission components.

Stay safe Navajo Nation and always buckle up.

03/23/2026

Retired Navajo Police Officer Rose Jeffy Passes Away

The Navajo Division of Public Safety extends its deepest condolences to the family, friends, and colleagues of retired Navajo Police Officer Rose Jeffy, who passed away peacefully on Friday, March 20, 2026, at Sage Memorial Hospital in Ganado, Ariz., surrounded by her family and loved ones.

Rose Jeffy faithfully served with the Navajo Police Department Chinle District for 16 years, beginning her service on December 31, 2001. She dedicated her career to protecting and serving the community until her retirement on January 31, 2017, due to medical reasons.

During her time with the department, Officer Jeffy was respected by her fellow officers and colleagues for her commitment, professionalism, and service to the Navajo Nation. She remained a cherished member of the law enforcement family and was loved by many who had the privilege of working alongside her.

The Navajo Division of Public Safety and the Navajo Police Department extend their heartfelt prayers and condolences to her children, grandchildren, family members, and all who knew her.

In honor of her service, personnel from the Navajo Division of Public Safety, Navajo Police Department along with other agencies provided an es**rt from Sage Memorial Hospital to Green Meadows Funeral Home in St. Michaels, Ariz.

Rose Jeffy’s dedication and service to the Navajo Nation will always be remembered, and her legacy will continue to live on through the many lives she touched throughout her career.

03/23/2026

The Navajo Police Department Crownpoint District cordially invites you to attend the Annual Justice Law Day at the Crownpoint Judicial Complex.

This event is an opportunity to engage with departments and community partners, learn more about the justice system, and access valuable resources and services available to the public.

Event Details:
Date: April 3, 2026
Time: 9:00 AM – 12:00 PM
Location: Crownpoint Judicial Complex

We will have department presentations, informational booths, and resources available for community members. Departments and organizations are welcome to participate and provide services during the event.

We encourage you to join us and help us promote awareness, education, and community collaboration in support of justice and public service.

We look forward to seeing you there.

03/06/2026

ABOUT US:
There is hereby established the Fleet Management Department within the Division of General Services of the Navajo Nation Government Executive Branch.
PURPOSE:
The Fleet Management Department shall provide motor vehicle transportation services to the Navajo Nation Government, Departments, and Programs through a financially self-sustaining operation. The vehicles assigned to the Navajo Nation Departments and Programs serve the Navajo Nation population through the Navajo Nation Government.-fleet.navajo-nsn.gov

DISCLAIMER: I created this page for information related to Navajo Nation government vehicle care, upkeep and driver responsibilities. This page is not endorsed by, directly affiliated with, maintained, authorized, or sponsored by the Navajo Nation.

Followers: Some subjects and post can be applied to your own personal owned vehicles (POV). Please let’s keep the comments civil, comments deemed offensive, political, or off subject matter will result in removal of those comments and individuals. This page is not for stirring the pot, complaining, politics, etc.

Stay safe and always wear your seatbelts.

02/19/2026

RENTAL VEHICLES:

We have within the Rental Fleet, vehicles that are suitable for most any weather conditions and situation.
Rental Vehicle Access, Conditions/Cost:
The Rental Status vehicles are temporary use vehicles and are always in high demand, with that in mind, it would be prudent to RESERVE well in advance of the intended pickup date. Rental Vehicles that are put on RESERVE status and if not canceled two, (2) business days prior to pick up date will be charged for that day.
The Rental vehicle may be accessed by the initiation of an Interdepartmental Charge Requisition (ICR) for the intended dollar amount or time interval. The ICR must be received prior to picking up any rental status vehicle and must be signed from General/Contract Accounting for “Approval for Funds Availability”.

The Cost for daily rental vehicles varies and depends on class desired, call or refer to budget manual.

Rental Vehicles picked up prior to 4:00 p.m. will be charged for the full day, if picked after 4:00 p.m., the next day will be the start of daily charges. Rentals utilized throughout weekends shall be charge for those days and may include holidays. When picking up a Rental Vehicle, please provide your approved Travel Authorization, copy of ICR, VALID Navajo Nation Operators Permit and State Driver’s License
Upon return of rental, drivers are to refuel, ensure vehicle is clean and have ending mileage and report any concerns.

Please wear seatbelts when operating any motor vehicle, stay safe Navajo Nation.

02/11/2026

Refer to your vehicle owners manual for the correct coolant for top off's.

Good morning Navajo Nation and always wear your seatbelts.

Coolant vs Water in a Car Radiator

In an automotive cooling system, the working fluid must transfer heat efficiently, prevent corrosion, and operate safely under high temperature and pressure.
While plain water has good heat-absorbing ability, it cannot provide full protection required for modern engines.

📌Boiling and Freezing Characteristics

Water boils at 100 °C, but inside an engine the temperature can exceed this.
Engine coolant (ethylene glycol or propylene glycol mixture) raises the boiling point to about 120–130 °C and lowers the freezing point below −30 °C, ensuring stable operation in all climates.

👉 This prevents:

Overheating in traffic or heavy load

Coolant freezing and cracking engine parts

📌 Corrosion and Scale Protection

Plain water contains minerals and oxygen that cause:

Rust in radiator, water pump, and engine block

Scale deposits blocking radiator passages

Reduced heat transfer efficiency

Coolant includes corrosion inhibitors and anti-scale additives that:

Protect aluminum, iron, and copper components

Keep cooling passages clean

Extend radiator and engine life

📌 Lubrication of Cooling Components

Modern cooling systems rely on the water pump seal and bearings.
Water provides no lubrication, causing early pump failure.

Coolant contains lubricating additives that:

Protect pump seals

Reduce wear and leakage

Improve long-term reliability

📌Heat Transfer Stability

Although water absorbs heat quickly, coolant mixtures provide controlled and stable heat transfer without boiling, foaming, or forming steam pockets.
This ensures:

Uniform engine temperature

Better combustion efficiency

Reduced risk of head-gasket damage

✔ Best Practice Recommendation

For most vehicles, the correct mixture is:

50% Genuine Engine Coolant + 50% Distilled Water

This ratio provides:

Maximum thermal protection

Corrosion resistance

Long service life of radiator, pump, and engine

Dr.mechanics

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02/05/2026

The Navajo Police Department would like to extend our deepest condolences to the Arizona Department of Public Safety and to the families, friends, and colleagues of the two personnel who tragically lost their lives in the helicopter crash this morning. Their service, courage, and dedication to protecting others will not be forgotten.

We are profoundly grateful for the continued partnership and air support provided by the Arizona Department of Public Safety to the Navajo Nation. Even in the face of such heartbreaking loss, your commitment to public safety and service reflects extraordinary strength and professionalism.

Our thoughts and prayers are with the entire DPS family during this difficult time. We stand with AZDPS in grief and honor the service and sacrifice of those lost. May the memories of these fallen heroes bring comfort, and may their legacy of service continue to inspire us all.