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Poor or no heat issue with 1992 Mazda 626

#452125
Digger89LDigger89L
Participant

    Quoted From EricTheCarGuy:

    Keep in mind that the core can be restricted and still have flow through it, it’s like a radiator in that there are many passages in it so some can be plugged and others can be clear. With a situation like this you would get ‘partial’ heat because you are only using half of the heater core.

    Well …my worst fears have been realized: it has now gotten considerably colder, and the heat output has been reduced to virtually nil !!! Crap!!

    We have been having a very mild winter here on the Canadian prairies …daytime temps in the -5C to +3C or higher range since early December. The coldest its been is about -15C overnite. ….and the heater has been putting out acceptable levels of heat.

    Well, yesterday and today, the temp has been -28C during the daytime (-18F) with windchills in the -47C range (-52F) range. You can imagine what the windchill might be while driving 100 kmph down the highway!!!

    Even though the temp guage gets up to the “normal” range ….there is almost no heat from the heater at highway speeds, and almost acceptable heat when sitting at idle for a few minutes.

    Am I still dealing with air in the system here, or do I have another problem??? I’m putting the cardboard in front of the rad again tomorrow, in hopes of keeping the heat level up while driving on the highway …

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