Question about 1993 Toyota Previa
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? Could it be as simple as replacing the thermostat? We need the heat soon!
If there is a leak in the watercycle and the water level drops below a certain level the heating will not work.
The solution is to detect the leak and to replace the relevant problem part.
Posted on Oct 06, 2008
Thanks for the quick reply. What you have is a thremostat that is stuck in the "open" position. This would explain why the temp gauge reads low. Also, this condition will also cause the engine to seem like it is "revving up". Why? Because the OverDrive will not engage until the temperature of the coolant is 172 degrees F. When the coolant reaches that temp, the OD solenoid gets power from the ECU, dependant on the temp mentioned above...NOW, when the temp of the coolant DROPS below 172 (as in having a seized open thermostat), the solenoid is de-energized by the ECU, and the trans shifts OUT of OD. Downshifting to the next lower gear cause the RPMs to incerase. In any case, replace the thermostat, and whilst you are doing this, replace the coolant, also. If you have RED coolant, that is factory Toyota coolant. Is is a GOOD IDEA to continue using the red coolant if you already have it in your cooling system. Buy the stat and the coolant at a Toyota dealer. Do NOT buy an "aftermarket" stat. The cheaper ones do NOT have the air "wiggle" valve built into the stat. Install the stat with the little "wiggle valve" pointing straight up; "12 o'clock". Add 50-50 coolant water mix, Bleed the air from the cooling system & you will be fine.
Posted on Sep 24, 2008
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Posted on Jan 02, 2017
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