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TR2/3/3A tr3 heater vacuum lock?

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newmexTR3

newmexTR3

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Hey guys,

I had a good day a got a bunch of stuff done on the car, including putting my winter thermostat in. Part of the reason I did so was because my heater core wasn't warming up much, so I thought a hotter thermostat would solve that. As usual, I was wrong. I discovered that the hot fluid doesn't seem to be circulating from the passenger side hose through the core and then out again. I'm thinking that it may be an air bubble caught in the core which is impeding the flow, if that's possible. The core has worked in the past, and i recently installed a new heater control valve on the block, which i've verified is open. I can feel hot fluid from the valve up to the firewall and then from the passenger side hose to the heater core, but then nothing.

Any ideas on what I could do to "bleed" the heater core w/o removing my carpet and/or hoses from the interior?

thanks!
Gavin
 
Scary.... I am having the same problem on my TR6!!!
I've been trying to track it down systematically. Hey, it ain't rocket science. My heater core is newly installed since I just about finished my restoration. I even blew compressed air in the inlet tube and can hear the liquid flowing through the return, but still no heat.
I installed a new heater valve when I rebuilt the engine but I guess it's possible that it could be faulty. Let me know if you find anything that helps.
Gliderman8
 
With the engine cool and off, loosen the heater return hose where it joins the tube to the water pump. Start the engine, let it idle and pull the hose off for just a moment. You should get coolant flowing from the line to the heater. If not, rev the engine up a bit. Then jam the hose back on, shut the engine down, tighten the clamp and top up the coolant.

But normally, this isn't required, just reving the engine up should blow through any air locks. If that doesn't work, I would suspect a problem like a blocked heater core or collapsed hose under the dash (both of which are common problems on TR3s).

And wasn't someone else just talking about a brand new, defective TR6 heater valve?
 
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