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Doesn't have one. Temp is regulated by a blend air door that meters airflow across the heater core. If you're having temp problems, check out the blend door motor or the operation of the blend door iteself.

Rick

I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology. Visit my blog for cool articles and TSB's: http://free-auto-repair-advice.blogspot.com

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Q: Where is the heater control valve located on a 1991 grand marquis?
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