Question about 2000 Jeep Grand Cherokee

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Clogged heater hoses

Unclog

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Generally heater hoses do not clog. Likely the problem is in the heater core (inside the dash). Best thing I've ever used to flush a system is the same stuff you use in an electric diswasher, to do the dishes!! Add it to the radiator when it's cold, run it for around 45 minutes at idle with the heat on high. Let it cool down and drain the system, re-fill with water and run for a minute, then drain again to get everything out of there. I've found the easiest drain method is to remove the lower hose at the radiator. (runs between the water pump and radiator). Re fill with a 50/50 antifreeze mix and you should be good to go. BUT, if your dash gauge reads below 210 degrees, when it's warmed up, you may have a thermostat that is stuck open or missing, in which case it needs to be looked at. (therm is in a housing at the engine end of the upper radiator hose. spring end goes in the engine when replacing)

Posted on Jan 11, 2013

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No heat and both the radiator and thermostat are new.


There are a couple of possibilities....

1. The heater core has been bypassed. If the core was leaking someone may have looped the heater hose back on itself. Check to ensure that the supply and return heater hoses are in place and properly routed to the firewall.

2. The heater core may be clogged. Age does a lot as does old coolant to clog up a heater core. To check the core disconnect the heater hoses at the block. Blow through one hose and see if you can get coolant/air to pass through the core. You can raise one hose higher than the other and pour water through or use low-pressure air as well. If the core is clogged, it may be possible to unclog it using a diluted drain cleaner. Pour the diluted cleaner into both hoses and let sit for a time, then flush with clear water. This may take several attempts. If it works it will save much time and expense. The unfortunate downside is that there is also the possibility of generating a core leak this way. But considering that if you hadn't tried you would have to replace the core anyway, you have nothing really to lose.

3. The blend door in the heater control box may be stuck and not letting air pass thru the core to heat the cabin. This one is hardder to verify.

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