null

Heat & AC Parts

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • BESTfit Heater Valve With 5/8 Inch Inlet/Outlet Replaces W865850, MA1000 For Kenworth

    BESTfit Heater Valve With 5/8 Inch Inlet/Outlet Replaces W865850, MA1000 For Kenworth

    BESTFIT TRUCK PARTS

    $120.99
    BESTfit Pull To Close Heater Valve With 90 Degree Elbow* High Quality Heater Valve* Inlet: 5/8 Inch* Outlet: 5/8 Inch* Cable Controlled* 90 Degree Elbow* Sold Individually * Warranty On Heater Valve...
    02-070000026
    SKU:
    02-070000026
    Diameter Options:
    5/8 Inch
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $120.99
    Qty in Cart: 0
    Price:
    $120.99
    Subtotal:
  • BESTfit Heater Valve With 5/8 Inch Inlet/Outlet Replaces 869261, MA1680 For Kenworth T300

    BESTfit Heater Valve With 5/8 Inch Inlet/Outlet Replaces 869261, MA1680 For Kenworth T300

    BESTFIT TRUCK PARTS

    $187.99
    BESTfit Cable-Controlled Water Valve For Kenworth T300* High Quality Heater Valve* Inlet: 5/8 Inch* Outlet: 5/8 Inch* Type Of Operation: Cable Controlled* Pull To Open: Kenworth T300* Additional New...
    02-070000025
    SKU:
    02-070000025
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Interior
    $187.99
    Qty in Cart: 0
    Price:
    $187.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit 12V Thermostatic Switch W/ 12 Inch Capillary Tube Replaces RD5-8938-0 For Kenworth

    BESTfit 12V Thermostatic Switch W/ 12 Inch Capillary Tube Replaces RD5-8938-0 For Kenworth

    BESTFIT TRUCK PARTS

    $53.99
    Thermostatic Switch 12V W/ 12 Inch Capillary Tube By BESTfit Replaces RD5-8938-0 Fits KenworthMaintain reliable temperature control in your Kenworth truck's air conditioning system with the BESTfit...
    02-070000024
    SKU:
    02-070000024
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $53.99
    Qty in Cart: 0
    Price:
    $53.99
    Subtotal:
  • BESTfit 2 Pin High Pressure Switch Replaces 650697 For Kenworth T2000

    BESTfit 2 Pin High Pressure Switch Replaces 650697 For Kenworth T2000

    BESTFIT TRUCK PARTS

    $67.99
    BESTfit High Pressure Switch With Metric Fitting, 355 PSI Open & 250 PSI Close* High Quality High Pressure Switch* Fitting Style: Metric* Wire Type: For Pigtail Use 1546* Type Of Operation: Open -...
    02-070000022
    SKU:
    02-070000022
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $67.99
    Qty in Cart: 0
    Price:
    $67.99
    Subtotal:
  • BESTfit 2 Pin Binary Switch Replaces K301-370-1, 79PSD4-1 For Kenworth T400, T600, T660, T800

    BESTfit 2 Pin Binary Switch Replaces K301-370-1, 79PSD4-1 For Kenworth T400, T600, T660, T800

    BESTFIT TRUCK PARTS

    $75.99
    BESTfit Binary Switch For Kenworth* High Quality Binary Switch* Metric Fitting Style* Normally Closed:  - High: Off 426 PSI, On 241 PSI  - Low: Off 28 PSI, On 40 PSI* R12/R134A Refrigerant Type*...
    02-070000021
    SKU:
    02-070000021
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $75.99
    Qty in Cart: 0
    Price:
    $75.99
    Subtotal:
  • BESTfit 2 Pin Low Pressure Switch Replaces B652578 For Kenworth

    BESTfit 2 Pin Low Pressure Switch Replaces B652578 For Kenworth

    BESTFIT TRUCK PARTS

    $29.87
    BESTfit Low Pressure Switch Fits Kenworth T2000, T300-T450, T600, T660, T680, T700, T800, T880 & W900* High Quality Low Pressure Switch* Low Pressure Switch* Metric Fitting Style* R134A Refrigerant...
    02-070000020
    SKU:
    02-070000020
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $29.87
    Qty in Cart: 0
    Price:
    $29.87
    Subtotal:
  • BESTfit 7.875 X 8 X 2 Inch Heater Core Replaces 108263 For Kenworth T600, T800 & W900L/B/S

    BESTfit 7.875 X 8 X 2 Inch Heater Core Replaces 108263 For Kenworth T600, T800 & W900L/B/S

    BESTFIT TRUCK PARTS

    $192.99
    BESTfit Heater Core With 5/8 Inch Inlet/Outlet Fits Kenworth T600, T800 & W900Keep your cab heating system performing efficiently with the BESTfit 7.875 x 8 x 2 Inch Heater Core, designed to replace...
    02-070000019
    SKU:
    02-070000019
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    Height Options:
    7 1/2 Inch
    Length Options:
    2 Inch
    Width Options:
    8 Inch
    $192.99
    Qty in Cart: 0
    Price:
    $192.99
    Subtotal:
  • BESTfit 8 X 12 X 2.5 Inch Heater Core Replaces 110640, MC1005 For Kenworth T300-T450, T600, T660, T800, W900

    BESTfit 8 X 12 X 2.5 Inch Heater Core Replaces 110640, MC1005 For Kenworth T300-T450, T600, T660, T800, W900

    BESTFIT TRUCK PARTS

    $230.99
    BESTfit Heater Core With 5/8 Inch Inlet/Outlet Fits Kenworth T300-T450, T600, T660, T800 & W900* High Quality Heater Core* Height: 8 Inch* Length: 12 Inch* Inlet: 5/8 Inch* Product Name: Heater Core*...
    02-070000018
    SKU:
    02-070000018
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $230.99
    Qty in Cart: 0
    Price:
    $230.99
    Subtotal:
  • Kenworth T300-T450, T600, T800, W900 AC Expansion Valve, Block Style Replaces 589500BSM, RD-5-7115-0 By BESTfit

    Kenworth T300-T450, T600, T800, W900 AC Expansion Valve, Block Style Replaces 589500BSM, RD-5-7115-0 By BESTfit

    BESTFIT TRUCK PARTS

    $46.00
    BESTfit Trinary Switch Port Expansion Valve With 2 Ton Capacity Fits Kenworth* High Quality Block Style Expansion Valve* Inlet: Hose Side In #6/Out: #10 Female Insert O'Ring* Rating: 2 Ton* Port...
    02-070000013
    SKU:
    02-070000013
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $46.00
    Qty in Cart: 0
    Price:
    $46.00
    Subtotal:
  • BESTfit Pull To Close Heater Valve Replaces MA1695, 870084 For Kenworth

    BESTfit Pull To Close Heater Valve Replaces MA1695, 870084 For Kenworth

    BESTFIT TRUCK PARTS

    $90.99
    BESTfit Cable-Controlled Heater Valve With 5/8 Inch Inlet & Outlet* High Quality Heater Valve* Driver Side* Sold Individually* Warranty On Heater Valves Against Defects In Workmanship & Material From...
    02-070000004
    SKU:
    02-070000004
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $90.99
    Qty in Cart: 0
    Price:
    $90.99
    Subtotal:
  • BESTfit Expansion Block Replaces 540446BSM For Kenworth T680, T800 2012-2016

    BESTfit Expansion Block Replaces 540446BSM For Kenworth T680, T800 2012-2016

    BESTFIT TRUCK PARTS

    $48.79
    BESTfit Expansion Block With 2 Ton Rating & 2 Service Ports* High Quality Expansion Block * Features:   - 2 Ton Rating   - Block Type Mounting   - R12/R134a Refrigerant Type  - Number 6 Hose Inlet...
    02-070000002
    SKU:
    02-070000002
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $48.79
    Qty in Cart: 0
    Price:
    $48.79
    Subtotal:
  • FREE SHIPPING
    BESTfit AC Evaporator Replaces 2719524 For Kenworth T600, T660, T680, T800, W900

    BESTfit AC Evaporator Replaces 2719524 For Kenworth T600, T660, T680, T800, W900

    BESTFIT TRUCK PARTS

    $264.99
    AC Evaporator Fits Kenworth By BESTfitKeep your Kenworth AC system performing at its best with the BESTfit AC Evaporator, a precise replacement for 2719524. Constructed from copper, brass, and...
    02-070000001
    SKU:
    02-070000001
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $264.99
    Qty in Cart: 0
    Price:
    $264.99
    Subtotal:
  • FREE SHIPPING OVER $249
    OEM Single Shaft Blower Motor 12V CW For Peterbilt 300 Series

    OEM Single Shaft Blower Motor 12V CW For Peterbilt 300 Series

    OPP - ORIGINAL PARTS PROGRAM

    $131.99
    Blower Motor Fits Peterbilt* High Quality Blower Motor* Sold Individually* Warranty On Blower Motor Against Defects In Workmanship & Material From Date Of Purchase*|** This Is An OEM Replacement...
    01-1503029
    SKU:
    01-1503029
    Truck Class:
    Heavy Duty
    Diameter Options:
    3 Inch
    Length Options:
    4 Inch
    Color:
    Black
    Make:
    Peterbilt
    Product Type:
    Interior
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • FREE SHIPPING
    HVAC Blower Motor Replaces ABP N83 301073, HA12600 For Peterbilt 378, 379, 387

    HVAC Blower Motor Replaces ABP N83 301073, HA12600 For Peterbilt 378, 379, 387

    OPP - ORIGINAL PARTS PROGRAM

    $447.99
    Blower Motor Fits Peterbilt* High Quality Blower Motor* Sold Individually* Warranty On Blower Motors Against Defects In Workmanship & Material From Date Of Purchase*** This Is An OEM Replacement...
    01-1503028
    SKU:
    01-1503028
    Truck Class:
    Heavy Duty
    Diameter Options:
    3 Inch
    Length Options:
    5 Inch
    Color:
    Black
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $447.99
    Qty in Cart: 0
    Price:
    $447.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Interior Fresh Air Filter For Peterbilt

    Interior Fresh Air Filter For Peterbilt

    CAB FRESH FILTER CO.

    $22.07
    Peterbilt Interior Fresh Air Filter AssemblyKeep the inside of your cab fresh with this aftermarket interior filter from CAB Fresh. This filter features internal antimicrobials that stops mold...
    01-1503026
    SKU:
    01-1503026
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $22.07
    Qty in Cart: 0
    Price:
    $22.07
    Subtotal:
  • FREE SHIPPING OVER $249
    Cab Fresh Replacement Filter For Peterbilt

    Cab Fresh Replacement Filter For Peterbilt

    CAB FRESH FILTER CO.

    $17.91
    Interior Replacement Filter Fits PeterbiltFind aftermarket CAB Fresh replacement air filters for your Peterbilt at 4 State Trucks. It mounts under the dash in the interior of your cab and features...
    01-1503019
    SKU:
    01-1503019
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    $17.91
    Qty in Cart: 0
    Price:
    $17.91
    Subtotal:
  • FREE SHIPPING OVER $249
    Interior Cab Fresh Air Filter For Peterbilt 330, 335, 340, 357, 367, 377, 378, 379, 385 & 386

    Interior Cab Fresh Air Filter For Peterbilt 330, 335, 340, 357, 367, 377, 378, 379, 385 & 386

    CAB FRESH FILTER CO.

    $46.73
    Peterbilt Cab Fresh Air FilterThis air filter is easy to install under the dash. Just slide it into the existing OEM track located by the passenger door. Follow these simple steps, and you'll have it...
    01-1503018
    SKU:
    01-1503018
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $46.73
    Qty in Cart: 0
    Price:
    $46.73
    Subtotal:
  • FREE SHIPPING OVER $249
    Interior Cab Fresh Air Filter Replacement For Peterbilt 377, 378, 379 & 385

    Interior Cab Fresh Air Filter Replacement For Peterbilt 377, 378, 379 & 385

    CAB FRESH FILTER CO.

    $43.85
    Peterbilt Interior Cab Fresh Air FilterThis air filter fits under the dashboard on the passenger side. Simply slide the filter into the existing track next to the passenger door. It replaces the...
    01-1503017
    SKU:
    01-1503017
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $43.85
    Qty in Cart: 0
    Price:
    $43.85
    Subtotal:
  • FREE SHIPPING OVER $249
    Chrome AC Dash Vent For Peterbilt

    Chrome AC Dash Vent For Peterbilt

    UNITED PACIFIC

    $7.78
    Chrome A/C Dash Vent Fits Peterbilt 200 SeriesDo You Need An Aftermarket Vent For Your 2006 Or Newer Peterbilt? 4 State Trucks Offers Chrome-Plated Dash Vents By United Pacific To Replace Your...
    01-1503010
    SKU:
    01-1503010
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Peterbilt
    Finish Options:
    Chrome-Plated
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $7.78
    Qty in Cart: 0
    Price:
    $7.78
    Subtotal:
  • FREE SHIPPING OVER $249
    Chrome Round A/C Vent Direct Replacement For Peterbilt 359

    Chrome Round A/C Vent Direct Replacement For Peterbilt 359

    UNITED PACIFIC

    $18.28
    Round A/C Vent - Chrome Plated PlasticRefresh the look of your Peterbilt 359 interior with this Chrome Round A/C Vent Direct Replacement, built for dependable performance and lasting style. Built...
    01-1503002
    SKU:
    01-1503002
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Peterbilt
    Finish Options:
    Chrome-Plated
    Product Type:
    Interior
    Shape Options:
    Round
    Ready To Ship:
    Yes
    $18.28
    Qty in Cart: 0
    Price:
    $18.28
    Subtotal:
  • Total: items /

Adding your products to cart

Frequently Asked Questions About Heat & AC Parts

How do I know if a heater or AC component will fit my truck?

Heat and AC parts are often specific to the make, model, and year of your truck, as well as the cab configuration. Check the product listing for compatible makes and models before purchasing, and compare part numbers with your existing component whenever possible. If you are unsure, our customer service team can help confirm fitment before you order.

Can I install a heater core, blower motor, or AC component myself, or do I need a professional?

Many components, such as blower motors, resistors, and control switches, can be replaced by drivers or shop technicians comfortable with basic electrical and mechanical work. However, jobs involving the AC refrigerant system, such as compressors, condensers, or evaporators, require certified equipment to safely recover and recharge refrigerant, so these are typically best left to a qualified technician.

What is the difference between OEM and aftermarket heat and AC parts?

OEM parts are made to match the original specifications of your truck and are often priced higher, while aftermarket parts are manufactured by third parties to fit and function similarly, usually at a lower cost. Both can be reliable options, so it often comes down to your budget, the specific part you need, and any preference for original manufacturer branding.

Why is my truck's AC or heater not working as well as it used to?

Reduced heating or cooling performance is commonly caused by issues like a failing blower motor, a clogged heater core, low refrigerant, a worn compressor, or electrical problems with switches and resistors. Diagnosing the exact cause usually requires checking airflow, listening for unusual noises, and inspecting for leaks or worn components before selecting a replacement part.

Do heat and AC parts come with a warranty?

Warranty coverage varies by manufacturer and specific part, so we recommend checking the warranty information listed on each product page before purchasing. If you have questions about a warranty on a specific item, our customer service team is available to help clarify coverage and terms.


Introducing the Official 4 State Trucks Mobile App – Gear Up On the Go!