Why would temp gauge move up while driving then cause the AC to blow warm?

Asked by KimfromHouston May 26, 2021 at 10:01 PM about the 2006 Toyota Sienna XLE 7-Passenger

Question type: Maintenance & Repair

2006 Toyota Sienna XLE - Temp gauge moves up about half-way between
normal and hot while driving and causes the AC to start blowing warmer air
(compressor went off?).  Then at some time later (doesn't seem to be any
consistent trigger) the temp gauge goes back to normal and AC starts
blowing normal again.  Repeats somewhat randomly but is worst when
ambient temp is hotter (don't really notice the problem when outdoor temp in
70s but today it was 84 and issue was pretty bad.  Had the AC system
replaced last year and it seemed to fix AC (mostly - but also had cooling
system issues last year - thought we fixed).  Since the temp is high now, the
issue is very prevalent.  This also happens when I'm in a drive through or at
a light - temp goes up, AC blows warm until I get going - it's kind of random
when AC comes back on.

3 Answers

157,625

Sounds like you have air trapped in the cooling system. Hope that helps! Jim

1 people found this helpful.
27,570

Some makes and models, if computer thinks engine is overheating, it may shutoff the ac compressor, it's a protection from overheating. good luck

1 people found this helpful.

Would this just 'happen'? We have not done anything to the cooling system in a long time. Is this something that would have happened after servicing or could it happen on its own anytime? Could there be a blockage? If so how would I diagnose or attempt to 'fix'? Thanks!!

Your Answer:

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