my heat takes a long time to heat up
my heater will take from my house (with a five minutes warm up) to town which is 30 min away from my house my ambient temp sensor
fluid level could be low, bad stat, or it could need a cooling system flush.
I had exactly this problem on a chevy car and it really just needed a good flush. after that it heated great.
I just put a piece of cardboard in the fins
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