Question about 1993 Toyota Previa

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Previa Heater Problem

My 94 Previa will not warm up in the winter. I am in San Antonio, Texas which is not exactly an extremely cold environment. In the winter when the heater is turned on the temp guage drops so far down that sometimes the transmission goes back into 3d gear versus overdrive. I have gone so far as to completely block the radiator with a cardboard panel. That is the only way I can keep a little bit of heat in the van. Nothing else has worked, including any number of termostats. Very puzzling and damn cold in the winter! Any answers, let me know Thanks, Brad My 1993 Previa LE heat has stopped working. Haven't used heat all summer, now weather's cooling and can't get any heat to come out! A/C works fine (although mildly noisy ringing sometimes). Any ideas on what to check? We need the heat soon! thanks

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Yes, check the thermostat. secondly if your van has more than 100,000 i recommend that you check the radiator cap for leaks this is done with a test kit.
* unfortunately the vans are know for blowing head gaskets. Its not uncommon to go through two head gaskets in the lifetime of the vehicle because its just a poorly designed motor."Sorry Toyota" Well I Hope this helps, good luck!

Posted on Dec 07, 2012

  • Micah Dale Dec 07, 2012

    yes, check the thermostat. secondly if your van has more than 100,000 i recommend that you check the radiator cap for leaks this is done with a test kit.
    * unfortunately the vans are know for blowing head gaskets. Its not uncommon to go through two head gaskets in the lifetime of the vehicle because its just a poorly designed motor."Sorry Toyota" Well I Hope this helps, good luck!

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Previa heaters are usually ultra-reliable.
So, regarding your question, the only reason for the temp gauge to drop down with the heater on is the thermostat is sticking open, or you have a lower than recommended thermostat installed. The factory thermostat is a 192 degree F/89 degrees C stat. Down your way, a lot of the parts places vend the "summer" thermostats, and I suspect that this is your problem.
Look to see what the temp degrees that are printed on the stat. Should be 192 F or 89 C. The "summer" stats are 185 F/ 85 C. Also, make sure that your stat has a small "wiggle valve", some aftermarket stats do not have this. Very important. Install the stat with the "wiggle valve" pointing straight up/12 o'clock...
Regarding your trans dropping out od OD, this is because the coolant temp is dropping below 172 degrees F. This is the threshold for the OD to engage. Below 172/no OD engagement.

Posted on Sep 24, 2008

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