In many cases, yes. One of the many radiator "stop-leak" products, put into the radiator will normally do the job.
Follow the manufacturer's instructions and add the stop-leak product, turn the heater on and set it to it's hottest of settings. Doing so will open the heater control valve, allow the maximum amount of radiator water to reach the heater coreand let the stop-leak product to do its work.
The way most of these products work is, they cool and solidify when they reach the leak and are suddenly exposed to cooler air. Just don't forget to turn the heater on- if the control valve won't allow the heated radiator contents to get to the heater core, it won't do any good.
Stop leak products sometimes do more harm than good. They can clog thermostats or reduce efficiency of radiator by reducing heat transfer ability. A quick fix is bypassing. Simply connect the two hoses together.
Not necessarily. It depends on what you mean by a bad heater core. The core will either be leaking or stopped up. If it is leaking, then it can cause the engine to overheat and the only fix is to replace it. A clogged or plugged heater core can sometimes be fixed by flushing it. You can also temporarily bypass the heater core until you can get it fixed. Just connect the inlet & outlet heater hoses together.
Without knowing what application you have this cannot be answered. For the majority an engine does not have to be pulled. It all about whether you can access the heads for removal or not.
Probably the heater blower motor.
We need to know what is wrong with the heater before it can be fixed.
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Check the temperature gauge. If it is running cold, replace the thermostat.
I would check to see if your heater core is plugged. I recently had the same problem and I flushed the heater core with fresh water from both inlet and outlet hoses(I used a garden hose with one of those nozzles that you can change the water pattern and set it on full). That fixed the problem for me.
Could be a bad heating element or a bad breaker, either of which can be fixed. The only reason to replace a water heater is if it is leaking. Anything else can be fixed cheaper.
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Low coolant? Heater core airbound, restricted, or plugged? Water pump not circulating coolant? Bad thermostat? Same prob on my 2000 Police Interceptor. Found out the blower motor was wired backwards from the factory. A friend fixed it so I didnt see. They swapped wires and now I have have heat!
I changed the heater cable. 10 minute job. Heater fixed and cost $10 for the part brand new at Kelly Holden.
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