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New Heater core, still no heat

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Old 01-07-2013, 12:49 PM   #1
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New Heater core, still no heat

I replaced my leaking heater core and have ran into trouble since then. The air only gets slightly warm, never hot enough to keep the cab at a comfortable temperature. Is there a way to bleed the coolant system to make sure hot coolant is getting to the core?

Also I installed an electric cooling fan at the same time, the thermostat for that fan kicks on at 185 and off at 170. The problem is once it kicks on it never kicks off, I'm assuming this is because it can't get the temperature down below 170. I did a search and it looks like most people have coolant temps closer to 200. Could this be why my heater isn't very warm? I ordered a new thermostat that kicks on at 200 and off at 185 and hopefully that will help.

Finally the blower for my heater is making a hideous noise unless it I turn it all the way on, then back to 3/4. Is there a good place to buy a new blower? Thank you. It is really cold here and I am tired of bundling up to drive somewhere.

Nate
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Old 01-07-2013, 12:51 PM   #2
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If the vehicle thermostat isn't working, you won't have fluid to the heater core.
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Old 01-07-2013, 12:58 PM   #3
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yes if the thermostat sticks open, you will be running cold and will not have heat. This happened with me and i also back bad fuel mileage. I changed the thermostat and voila back to HEAT
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Old 01-07-2013, 01:01 PM   #4
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I installed a new thermostat when I put a new motor in it a few months ago so it should be working. The temp gauge gets to right below the middle and never goes any higher, is this running cold? I will try a new thermostat because they are cheap though. Thanks, any other ideas?
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Old 01-07-2013, 01:05 PM   #5
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Quote:
Originally Posted by natemoore2088 View Post
I installed a new thermostat when I put a new motor in it a few months ago so it should be working. The temp gauge gets to right below the middle and never goes any higher, is this running cold? I will try a new thermostat because they are cheap though. Thanks, any other ideas?
Test it before you buy it. Just throw it in 185° F water. If it opens when hot and closes as it cools down...it's good.
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Old 01-07-2013, 01:10 PM   #6
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Just make sure you haven't mixed coolant types, ever. Mine created the sludge. It's okay to use the new stuff (Prestone any make, any color) as long as there is no trace of the old stuff.
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Old 01-07-2013, 01:33 PM   #7
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Too cold

I agree with the advice already given. Despite the thermostat being new, it's possible that it was/is defective. Doing the quick test in hot water first before installation (or with taking it out for a quick inspection) should indicate what you have. I was also thinking that you might have some air trapped in the line...you may need to burp the system. Also, verify that your collant levels are where they need to be and that you aren't running low. Top it off as needed.

You can try running a hotter thermostat, but do the research. Typically speaking, if you were comfortable with the heat at the start, then you probably only need to put in the same temp replacement thermostat. I recommend going with the OEM replacement rather than an aftermarket solution. I have an Ultragauge and monitor the coolant temperature. Winter or summer, once the engine warms up to operating temperature, it stays very close to 180 degrees (just takes longer to warm up in the winter). To get the engine to temperature quicker, you might opt for a partial radiator block in the winter months. Not sure how cold it gets for you there in the NW, but a partial block might be the way to go to keep the temperature near 180. The warmer the better when it comes to FE, but you want to keep the engine close to manufacturers specifications, especially if you are under warranty. Good luck!
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