Here's a general overview. This is not a detailed, step-by-step guide and should not be considered a substitute for a proper repair manual specific to your 1970 Dodge Charger's engine (e.g., a 383, 426 Hemi, etc.). The procedure varies slightly depending on the engine. Always consult a repair manual for your specific vehicle and engine.
Before you start:
* Safety First: Allow the engine to cool completely before starting any work. Coolant is hot and can cause serious burns.
* Gather Tools: You'll need various tools including wrenches (likely metric and/or SAE), pliers, possibly a socket set, and a drain pan to collect coolant. Gloves are highly recommended.
* Have Replacement Parts Ready: Purchase the correct thermostat for your engine. You might also need a new gasket.
General Steps (Highly engine-dependent):
1. Drain Coolant: Locate the radiator drain petcock (usually at the bottom of the radiator) and carefully open it to drain the coolant into your drain pan.
2. Locate the Thermostat Housing: This is usually on the engine block, near the top of the engine where the upper radiator hose connects.
3. Remove the Thermostat Housing: This will likely involve removing clamps (hose clamps) on the upper and/or lower radiator hoses and then loosening bolts holding the housing in place. Be prepared for some coolant spillage even after draining.
4. Remove the Thermostat: Once the housing is off, the thermostat will be inside. It's usually a spring-loaded valve.
5. Clean the Housing: Carefully clean any debris from the inside of the housing.
6. Install the New Thermostat: Install the new thermostat, ensuring it's seated correctly. Make sure the new gasket is properly in place.
7. Reassemble: Reinstall the thermostat housing, tighten bolts to the manufacturer's specifications, and reconnect the radiator hoses with clamps.
8. Refill Coolant: Refill the radiator with the correct type and amount of coolant (check your owner's manual). You may need to bleed the cooling system to remove any air pockets. This typically involves opening the radiator cap and running the engine until the thermostat opens (it will feel warmer).
9. Check for Leaks: After refilling, check for any leaks around the thermostat housing and hoses.
Again, this is a general outline. Refer to a repair manual specific to your 1970 Dodge Charger's engine for detailed instructions and torque specifications. Improper installation can lead to engine damage. If you're not comfortable performing this task yourself, it's best to take your car to a qualified mechanic.
