Heating
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My 98 3.9 was doing the same thing. Disconnected the heater hoses, drained it some, and put some blue devil radiator flush in the heater core only (under half a bottle). After ten to twenty minutes, give it a good, but gentle backflush. Helped mine heat much better. Heater core might be partially clogged, so it's not flowing enough water unless the pump is moving faster.
Edit: You will have to burp it after draining the heater core. Park nose up on a hill, the highest angle you can with the radiator cap off and bring it up to temp temp to try moving any air out of the heater core.
Edit: You will have to burp it after draining the heater core. Park nose up on a hill, the highest angle you can with the radiator cap off and bring it up to temp temp to try moving any air out of the heater core.
Last edited by Skreelink; 02-05-2019 at 08:12 AM.
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#8
My 98 3.9 was doing the same thing. Disconnected the heater hoses, drained it some, and put some blue devil radiator flush in the heater core only (under half a bottle). After ten to twenty minutes, give it a good, but gentle backflush. Helped mine heat much better. Heater core might be partially clogged, so it's not flowing enough water unless the pump is moving faster.
Edit: You will have to burp it after draining the heater core. Park nose up on a hill, the highest angle you can with the radiator cap off and bring it up to temp temp to try moving any air out of the heater core.
Edit: You will have to burp it after draining the heater core. Park nose up on a hill, the highest angle you can with the radiator cap off and bring it up to temp temp to try moving any air out of the heater core.
you could also start by just burping the radiator alone to see if that works before going through the hassle of flushing stuff.