SOURCE: coolant fill procedure
You may have air trapped in the system or rust plugging up the rear heater core. core, if it is just an air problem do this: Fill the radiator and the coolant recovery tank as full as possible, then raise the front of van as high as you can with a floor jack, run the engine until it is at normal operating temperature, let it cool down, running water over the radiator speeds this up, this should purge the air out of te system and cure your issue with the rear heater. Make sure you have a good radiator cap if it is the original one replace it. If the system still has no flow to the rear pull out the rear heater core and flush it out or replace it.
SOURCE: Coolant filling up overflow bottle
You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.
SOURCE: mitsubishi galant 2000 heater core replacement
If the air coming from your heater smells like antifreeze or your passenger side floor is wet with antifreeze, then your heater core is shot.
Till then it's fine as it could be a $700-1000 job.
Report those Bozo's
SOURCE: Heater core burned out and I want to bypass the coolant hoses.
use a short length of 15mm copper pipe and join the heater pipes together where ther connect to teh heater feed pipes in the engine compartment
SOURCE: my 2002 Galant is leaking
Your heater core is leaking. I'm guessing that when you turn on the vents for heat or a/c, you are probably getting vapor/steam inside the car. If this is the case, you need to have your heater core replaced.
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