If you lived around here you would fix the heat first

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I have read that the monovalve on the passenger firewall might be the culprit.
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Make sure you are getting 12vdc to the monovalve solenoid with the key on. If you are not start troubleshooting from there. Pull the monovalve insert and inspect the rubber. If it is busted or the solenoid portion does not cheak out with an ohmeter then replace it.