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Thermostat Kit Compatible with Mercury Marine Mercruiser 2.5L 3.0L Engine Replace# 59078Q3 59078T3 59078 Sierra 18-3650
✅ In stock
F
Grade
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Oct 8, 2026 6:04 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0/20
Deal Strength
0/20
Momentum
0/10
📝 Product Overview
🏪 Sold by
AUTO SOLUTION 2022
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓【Compatibility】: The thermostat kit is compatible with MerCruiser MCM GM 2.5L 3.0L inline 4-cylinder and 6-cylinder engines 120HP, 140HP, 165HP models.
✓【Replace Part Number】: Mercruiser 59078Q3 59078T3 59078T4 59078 59078A1, 59078B, 47590, Sierra 18-3650 18-3550 18-2831, GLM 13370 13020 31430, Mallory 9-43153, 9-43020, 9-60012.
✓【Durable Material】: The thermostat is made of high-quality copper, featuring excellent thermal conductivity. It can quickly sense the temperature change of the coolant and respond promptly, ensuring the engine operates at the optimal working temperature. Copper is corrosion-resistant and high-temperature resistant, enabling reliable long-term use even in seawater environments. The gasket is made of non-asbestos material, which is high-temperature resistant and effectively prevents coolant leakage.
✓【Precise Temperature Control】: The Thermostat Open at 60°C/140°F. It precisely regulates engine temperature, maintaining optimal operating range to effectively prevent overheating, thereby extending engine life.
✓【Package Included】: 1*140°F Thermostat, 1*Thermostat Cover Gasket.
⚙️ Specifications
HIMARKLIF
HIMARKLIF
Thermostat Kit
1.76 ounces
5.98 x 3.93 x 1.35 inches
ASMMT78Q3
No
ASMMT78Q3
Manufacturer
HIMARKLIF
Brand
HIMARKLIF
Model
Thermostat Kit
Item Weight
1.76 ounces
Package Dimensions
5.98 x 3.93 x 1.35 inches
Item model number
ASMMT78Q3
Exterior
No