{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
1999 GMC W4500 Forward
1
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
1999 GMC W4500 Forward

1999 GMC W4500 Forward Thermostats

Refine by:

Shop Catalog

Showing 1 - 9 of 9 results
Sort by:
Gates OE Replacement Thermostat
Gates®
Gates OE Replacement Thermostat
Part Number: GAT33019S
Guaranteed to Fit
$10.99
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L GAS, 195 Degree
Product Details
Prop 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Promotions : Cooling EssentialsOpening Temperature Rating : 195 degreesSeries : Gates OE ReplacementRecommended Use : OE Replacement
HD Series Thermostat
Motorad®
HD Series Thermostat
Part Number: MRD4057-85
Guaranteed to Fit
$12.49
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 4 Cyl 4.8L Temperature 185F; Oe Specified Temperature
Product Details
Location : Passenger SideQuantity Sold : Sold individuallyWarranty : 12-month Motorad limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Opening Temperature Rating : 185 degreesSeries : HD SeriesMaterial : Copper/Stainless SteelRecommended Use : OE Replacement
Thermostat
Motorad®
Thermostat
Part Number: MRD265-160
Guaranteed to Fit
$5.99
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L Temperature 160F; Alternate Temperature Option
Product Details
Quantity Sold : Sold individuallyWarranty : 12-month Motorad limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Opening Temperature Rating : 160 degreesRecommended Use : OE Replacement
High Flow Series Thermostat
Motorad®
High Flow Series Thermostat
Part Number: MRD2065-160
Guaranteed to Fit
$7.99
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L Temperature 160F; Alternate Temperature Option
Product Details
Quantity Sold : Sold individuallyWarranty : 12-month Motorad limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Opening Temperature Rating : 160 degreesSeries : High Flow SeriesRecommended Use : OE Replacement
HD Series Thermostat
Motorad®
HD Series Thermostat
Part Number: MRD4056-80
Guaranteed to Fit
$17.49
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 4 Cyl 4.8L Temperature 180F; Oe Specified Temperature
Product Details
Location : Driver SideQuantity Sold : Sold individuallyWarranty : 12-month Motorad limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Opening Temperature Rating : 180 DegreesSeries : HD SeriesMaterial : Copper/Stainless SteelRecommended Use : OE Replacement
Thermostat
Gates®
Thermostat
Part Number: GAT34769
Guaranteed to Fit
$28.49
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L GAS, 198 Degree
Product Details
Notes : 2.31 in. Total Height; 1.52 in. Depth from Flange; 1.2 in. By-Pass Flange Diameter; (1) Number of Seal; O-Ring Seal Type; OE-Exact ConstructionQuantity Sold : Sold individuallyWarranty : Lifetime Gates limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Promotions : Cooling EssentialsOpening Temperature Rating : 92 degrees CMaterial : Steel and copperRecommended Use : OE ReplacementProduct Fit : Direct Fit
Thermostat
Mahle®
Thermostat
Part Number: MAHTX5292
Guaranteed to Fit
$26.99
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L
Product Details
Notes : 57.5 mm HeightQuantity Sold : Sold individuallyWarranty : 1-year Mahle limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Promotions : European Vehicle PartsOpening Temperature Rating : 92 degrees CRecommended Use : OE Replacement
High Flow Series Thermostat
Motorad®
High Flow Series Thermostat
Part Number: MRD2065-180
Guaranteed to Fit
$9.99
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L Temperature 180F; Alternate Temperature Option
Product Details
Quantity Sold : Sold individuallyWarranty : 12-month Motorad limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Opening Temperature Rating : 180 DegreesSeries : High Flow SeriesRecommended Use : OE Replacement
Gates OE Replacement Thermostat
Gates®
Gates OE Replacement Thermostat
Part Number: GAT33019
Guaranteed to Fit
$9.49
Vehicle Fitment
  • 1999 GMC W4500 Forward W4S042 8 Cyl 5.7L
Product Details
Prop 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is 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.

Promotions : Cooling EssentialsOpening Temperature Rating : 195 degreesSeries : Gates OE ReplacementRecommended Use : OE Replacement
Page 1 of 1 | Showing 1 - 9 of 9 results

Top Rated Products

Gates Gates OE Replacement Thermostat
$9.49( Review)
Correct part
David B.
VERIFIED PURCHASER
Gates Gates OE Replacement Thermostat
$10.99( Review)
Installed this on my truck and it is so easy not having the old gasket it use to haveSee More
Robert P.
VERIFIED PURCHASER

Popular Products

Helpful Automotive Resources

P0597 Code: Thermostat Heater Control Circuit / Open
P0597 Code: Thermostat Heater Control Circuit / OpenDiagnostic trouble code (DTC) P0597 code stands for “Thermostat Heater Control Circuit/Open.”
What Does It Mean When the Engine Is Hot While the AC Is Off?
What Does It Mean When the Engine Is Hot While the AC Is Off?If you’re wondering how your engine gets so hot even if the air conditioning is off, then there are many explanations as to why. Usually, it’s due to a lack of coolant. In other cases, the culprit for an overheating engine is broken parts. Here are some of the potential
What Does Check Gauges Mean?
What Does Check Gauges Mean?The check gauge light is usually triggered once the PCM detects something reading that’s outside normal parameters. These readings include: Coolant TemperatureEngine RPMFuel LevelOil PressureTransmission temperatureTire PressureWheel SpeedVoltmeter Common Triggers of the Check Gauges Light
What Causes a Car to Overheat When Idling?
What Causes a Car to Overheat When Idling?Leaving your AC running may contribute to this problem because the car’s AC forces the engine to work harder. These factors combined can make the engine overheat very quickly. A simple solution would be to turn off the AC in hopes of lowering the temperature of the engine, but if
Why Is My Car Heater Not Blowing Hot Air?
Why Is My Car Heater Not Blowing Hot Air?The heater core distributes heat, blowing it into the air with a blower fan. In many ways, you could compare the heater core to a radiator because they are both heat exchangers. Damaged heater cores often go hand in hand with coolant problems.
Where Is the Thermostat Located?
Where Is the Thermostat Located?Have you driven your vehicle recently? Because if the answer’s yes, you’ll want to turn off the engine and let it cool down before trying to access the thermostat. This is because you’ll have to unclamp your radiator hose and drain your coolant before you can get to your thermostat.