You may not need to. I had the same problem. I had my heater core flushed. It had all kinds of black goo in it and now it works fine. I flush it myself about once a year now.
Brakes lock up on fast stops also horn doesnt work after truck is started.Horn works when key is off...
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Brakes lock up on fast stops also horn doesnt work after truck is started.Horn works when key is off could they be related?