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98 Dodge Dakota Heater Not Working?

I recently changed out my heater core because it was leaking. I purchased an after market part which turned out to be slightly smaller than the original. After putting everything back together I didn't get the same heat as before. If I sit parked I get heat, but once I drive down the road, it cools off. Someone told me if I put it on max ac, it will recirculate the cab air, and then it works decently. If I switch it to defrost or any other setting, it starts to cool down.

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It's as if I have too much air coming in and bypassing the core. The gauge on the dash says the temp is good and I have done everything possible to trouble shoot this (thermostat, bleed the coolant line, etc.). I also have a draft coming from the passenger side under the dash. What am I missing? I had plenty of heat before this all took place.

By Kent R

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February 1, 20140 found this helpful

I have a 1995 Chevy Silverado k1500 and I have the same problem. If you have fixed yours please post the issue. I also have had my hand on the heater core when hot then turned on the fan to blow hot air and half the core will be ice cold while the other side of core is hot. This is with the brand new core put in.

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