Question about Dodge Ram 1500

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What if the inlet get hot but the outlet doesnt an aready flushed it out several times, what could be the problem?

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  • Dodge Master
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The clog still exists. Maybe try to replace the heater core or the radiator or replace the part that has a blockage.

It's not clear to me by the description of the problem if the problem is more with the engine or with the heater core itself.

Good luck on this repair.

Posted on Jan 02, 2011

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Looking for location on engine side of heater core hoses. I can see the outlet hose but am unable to locate the inlet hose to the engine.


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The core may be plugged, or it may have an air lock, or the core may be fine and the doors in the heater case may not be opening properly to pass heat.

With the engine at normal operating temperature, feel both the inlet and outlet core hoses at the firewall. If the coolant is circulating both hoses should be hot. If only one is hot, try cracking open the outlet line, with engine running, to get flow started from an air block. (The outlet line will run from the firewall to the front of engine near or at the water pump housing. The inlet for the heater comes off the top of engine from a head fitting and goes to the firewall.) If no flow results, the core may be plugged. To flush the core, take both hoses off at the firewall or off at where they fit on the engine, and put a garden hose into the outlet-flush it backwards-run until clear-let the water run to ground or use a catch can if able to. Some people use compressed air into the core instead of water flushing. Either way, you should see some sediment come out if it had any blockage. Once you get the heater core circulating, any further heater problems need to be addressed at the heater case. Make sure the temperature blend door can open and close-this door opens to let blower fan air pass across the heater core.
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I have a 2000 pontiac grand prix GT-- I all of a sudden have nothing but lukewarm heat at best blowing. Also my car always runs at 210 but now doesnt get even close to that. We replaced the thermostat, had...


There is an inlet and outlet rubber hose going to your heater core. At operating temp the 2 hoses should be the same hot temp, if not, swap them making the inlet the outlet vise/versa and see if it makes a difference. Run vehicle like that a few days and this will make sure the core is unplugged. If this does not work there is a thermal relay in the blower compartment that may be faulty. To get at that you pull out the fan blower under dash and it will be right next to it. You may need to access the mounting screws for it through the hood and air sytem filter. I will put my money on a plugged core, even though it was flushed!!

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yes drain the coolant and then add 200grms of caustic soda and run engine till hot then give a good flush and then remove the heater feed pipes and flush with hose reversing direction a couple of times ,might help but cant guarentee it because the layout of the heater coil is such that the water doesnt pass from one side to the other but the inlet and outlet are both on teh same header tank .But the caustic will help to more some of the clag

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