Not only does the dash require removal,but you will also need to completely remove the hvac module assembly from the vehicle after the dash is out of the way. the module will have to be diassembled in order to replace the core.--hvac module removal will require ac refrigirant recovery and coolant replacement.--it sounds like a lot of work but should only take you about one good saturday if its your first time around the block.---good luck.
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check that the heater control (tap) that allows water through the core is actually opening Remove a heater hose and see it the water is circulating through the heater core.
i am assuming you mean heater core, you have to remove the pass rear cargo trim panel and any trim that interlocks to it as well as any connectors then the heater box and hoses from under the vehicle as well as if it has rear ac the ac system needs to be discharged first and those lines removed as well, then remove the box from the vehicle and seperate the case halves and replace the core, the reinstall in the reverse order of removal
You have a leak in the heater core. It will have to be replaced. It's not all that rare these days, with the poor quality factory heater cores. The replacement cores are much better.
I think that one still uses cables to control the blend doors and vent doors. Are you sure those are working and/or connected.
Also when you replaced the thermostat and heater core did you bleed the cooling system? With the engine cold remove the radiator cap and let engine idle up to operating temp while keeping the radiator topped off with coolant.
The heater uses water to deliver heat and the A/C delivers cold with freon. If you have no water, the heater valve is stuck, or your heater core is plugged, you will not get heating but your A/C will still work just fine.
No, Relays control the fan running. But you said it is running. Low coolant level, clogged heater core or sticking temperature door could be the problem. Is the engine running at normal temp? Open thermostat could cause low temperature.
You can remove both hoses from the core and put them together using a short length of copper plumbing pipe. No problem to engine from this it flows through just like its going to core( engine can't tell the difference)
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