Take cap off rad when cool enough to do so. Start the car with cap off & heater turned on,(not defrost) and let it run for a while, as in wait for rad fan to come on 2 or 3 times. Add coolant/mix as needed while doing so. My guess is that you have an air lock in cooling/heating system that hasn't been bled out yet. Once in a while just rev engine a little, for about 30-second to 1 minute to increase flow through system, to help bleed & circulation. You should start to feel heat coming. Only put rad cap back on after rad fan has come on after 2nd or 3rd time. Check return bottle & fill it to mark as specified. If that doesn't do it, take it back to guy who flushed it, he should know what he did wrong.
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Outstanding outcome, I took the car back to the shop and explain the problem. They made the statement that there was air in the system and they repeated the service at no cost to me. The heater works just fine now. I really like my Crown Vic. its not the best looking car however the performance and ride on these cars are outstanding.
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