Replace a leaking or weak heater core with this premium heater core for 1973-87 Square Body Chevy & GMC Truck Heater Core with Air. USA1 Industries offers this high-quality replacement to restore proper cabin heat and dependable performance during cold weather driving.
This heater core is designed to transfer heat from the engine’s cooling system into the cab, allowing your heater to warm the interior efficiently and evenly. Built from durable aluminum, it offers improved corrosion resistance and long service life compared to older copper or worn factory units.
Engineered to meet or exceed original GM specifications, this heater core installs directly into the factory heater box with no modifications required. Each unit is pressure tested and leak checked before shipping to ensure reliable, trouble-free operation right out of the box.
Key Features
- Fits 1973–1987 Square Body Chevy & GMC trucks with factory air conditioning, K5 Blazers, Jimmys, Suburbans.
- Direct replacement for original heater core
- Restores proper cab heat and defrost performance
- Aluminum construction for durability and corrosion resistance
- 100% leak tested before shipping
- Designed to match original fit and function
- Installs using factory mounting locations
- Dimensions are 7.25X8" 3/8 x 2"
- Ideal for restorations or cooling system repairs
If your Square Body isn’t keeping the cab warm or you’re dealing with coolant leaks inside the truck, this heater core is a reliable solution built to keep your classic Chevy or GMC comfortable year-round. Doing a full restoration or fan getting weak upgrade with our 1978-87 Square Body Chevy & GMC Truck Blower Motor with AC or maybe your looking for the one without air 1973-87 Square Body Chevy & GMC Truck Heater Core, w/o Air.
- Year Range:
- 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
