Before we can accurately diagnose problems with an automotive heater, we first need to answer the question asked by thousands of…
Do Not Attempt a Heater Core Replacement Without Detailed Procedures for Guidance
When replacing your heater core, remember that heater core replacement procedures vary from vehicle to vehicle. Refer to the heater core replacement instructions for your specific vehicle and NEVER attempt to replace a heater core without following a heater core replacement procdure for your vehicle. Too many parts have to be disconnected or removed in order to access the heater core for you to attempt it without a step-by-step procedure.·A subscription to AllDataDIY is the smartest investment anyone can make.
Tools Needed for a Heater Core Replacement
The basic tools required for a typical heater core replacement include a straight-slot screwdriver, a set of open-end wrenches, a set of sockets and a pair of pliers.·This will also be a good time to replace the heater core hoses, hose clamps, thermostat and the radiator cap.
Manufacturer Technical Service Bulletins·
Some manufacturers have issued Technical Service Bulletins (TSBs) to address the cause and recommended remedies for heater core failures. A single TSB may cover a wide range of models and years. For example, Ford Motor Company issued TSB 06-21-19 to address electrolysis-related premature heater core failure in over 200 Ford, Mercury and Lincoln models.
Bypassing Your Heater Core
This tip will render your heater completely inoperative because it bypasses the heater core. So, make sure you can live without a heater for a while before you undertake this procedure. On the other hand, if your heater core is leaking, you probably aren't able to use the heater because of the mist that forms on the windows during cold weather. Besides, you should not be breathing the mist that forms when your heater core is leaking because it is toxic. The best bet is simply to park your vehicle and not drive it until you replace the heater core. But if that's not an option, then you will find this tip very helpful.....
To stop your heater core from leaking so that you can drive the vehicle until you can replace the heater core, simply drain a couple gallons of coolant from the radiator, remove both heater hoses from the heater core pipes, and connect the ends of the heater hoses together. This allows the coolant to flow normally without passing through the heater core. You can get an inexpensive cooling system flush kit at the local Walmart or auto parts store that will have have an adapter that will connect your heater hoses.
Simply install the adapter to join the hoses together, replace the coolant that you drained and check for leaks. As seen here, the garden hose fitting makes a great way to top off the cooling system to reduce or eliminate air blocks that sometimes develop when filling through the overflow tank.
