When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
USED ITEM APPEARS IN GREAT CONDITION (SEE PHOTOS). SEE PHOTOS FOR ANY DETAILS NOT LISTED HERE. ITEM SHIPS FREE WHICH SAVES YOU ALOT WITH TODAYS SHIPPING COSTS!
factory under-dash heater core housing box for classic 1968–1972 General Motors (GM) A-body vehicles equipped without factory air conditioning (Non-A/C).
Below are the breakdown specifications and design details for this original component:
⚙️ Physical Specifications
- Housing Material: The main structure consists of molded, heavy-duty black fiberglass/molded composite plastic body sections joined with metal assembly clips and perimeter hex-screws.
- Core Unit: Features a centrally mounted aluminum or copper/brass radiator-style heater core matrix with densely packed heat-transfer cooling fins.
- Firewall Connections: Standard dual coolant tubes (inlet and outlet supply lines) mounted to a sealed rust-preventative metal reinforcement plate that matches the specific firewall pattern of non-A/C passenger cars.
🗺️ Airflow & Function Details
- Multi-Tier Ducting: The elongated upper section acts as a distribution manifold, routing heated air upward directly into the firewall/dash junction.
- Control Door Flaps: Internal metal vacuum or cable-actuated blend doors direct air pressure variations dynamically between the floor and windshield defrost circuits.
- Integration Point: The lower discharge area mounts directly onto the 9790487 lower deflector floor vent to evenly disperse warm air beneath the dashboard on models lacking a full center console.
🛠️ Restoration & Identification Benchmarks
1968–1972 General Motors (GM) A-body vehicles
- OE Part Cross-Reference: Original factory units typically correlate to GM master housing assembly numbers such as 3017881.
- Physical Differences (Non-A/C vs. Factory A/C): Non-A/C under-dash boxes are significantly thinner and simpler. True factory A/C configurations include heavy, bulky under-dash duct frameworks, integrated air conditioning expansion/evaporator cores, and dedicated blend compartments that vastly differ in size.
Item location shelf P
