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3s-gte in a Camry?!?
'89 Camry Alltrac
9,090 Posts
Is this an LE?
Definitely need more info. To expand on this, if it is an LE (push-button controls), the solder joints on the control panel PCBs can go bad, which leaves you without heat. Try pulling it out and re-soldering all the connections (at the temp slider, cables between boards, etc.). Mine does it when the weather is really cold (like, below freezing - the perfect time for it to fail...)

If it is the engine not warming up, that's a different issue. If the temp gauge is at the middle, there should be enough heat in the engine coolant to heat the cabin.

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