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Re: Brrr it's cold
Did the heat work and then stop?
Check the Vacuum switch on the heater hose just before the heater core at the firewall.
Pull the vac line with the Jeep running, turn the heat on high and see if there is vacuum at the line. If not you need to find the vacuum leak. My did this and I just unhooked the vac switch at the actuator arm on the switch (there is a small circlip that holds the arm on the switch). The valve stays open all of the time when this is done, but the heat works.
I hope this works.
Good luck.
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