Having problems with your 1997 Plymouth Voyager ?

Heater i am having heat problems with my 1997 plymouth grand voyager' and i was told the backflush the heater core lines. i am not even sure where the heater core is. but i was hoping that someone could tell me how to do this. i really need some heat cuz its negative 20 out here in iowa. this might not be the problem cuz whats happening is we dont get any heat unless we are revving the engine to the point that the tachometer is atleast running at 2000 RPM.

Posted / edited by AnonymousUser on : 11-02-2019

Answers :

You can find the heater hoses easily. they generally are two either 5/8 or 3/4 inch hoses that run from the engine into the firewall one of them may have a control unit on it that is vacuum operated. To flush, Remove the hoses at the engine, let them drain out, then hole both above the engine and fill one with white vinegar, till it comes out of the other one. Let it sit about a hour, then attach a garden hose to either hose and turn it on full blast and let it run fro about five minutes, then attach hose to other one and do the same. After you have finished, attach them back on the engine and run with heat on high and add whatever you lost back into the radiator. Most times the heat will be much better. Also make sure the engine is reaching operating temperature ...If not, replace the thermostat.
It may be helpful to get yourself a haynes or chilton manual...they are around $20 and are very helpful for a novice.
Good luck! (there are harsher chems you can use for flushing but I have used vinegar and it seems to work just as well...it is basically acetic acid in a mild form. If you need something harsher, generally the core is too plugged to flush in the first place and nothing will correct that except replacement)
Repair Help & Product Troubleshooting for 1997 Plymouth Voyager

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