[TR] TR3 Maradyne Heater

[Kinderlehrer]

Bill, I don't know anything about this heater, but on my original TR3A heater,
when t he output goes down from dismal to cold, it's usually because the
capacity of the core is being deminished by buildup in the core itself.B 
Water coming out the output hose is hot because it never makes it way through
t he core.B  When that happens, I remove the heater, fill it with vinegar and
water, shake rinse, flush, and repeat until I can fill it with whatever the
rated capacity is. Perhaps your heater is similar in that regard. B 

Bob



----- Original Message -----


From: "William Brewer" <wsb1960tr3a at att.net>
To: "Triumphs" <triumphs at autox.team.net>
Sent: Tuesday, November 8, 2011 7:28:44 AM
Subject: [TR] TR3 Maradyne Heater

B B  B  So last night I removed the heater discharge hose at the through
bulkhead
fitting in the engine compartment. I started the engine and steaming hot water
shot out through the fitting, showing that the heater core is clear and moving
coolant.
B B  B  I had previously blocked off the coolant bypass (the little hose)
using a
pipe plug. I got the idea from Bob Schaller. I decided to remove that, which
made no change.
B B  B  It looks like something is preventing the coolant from returning from
the
heater core to the radiator. I'll check tonight to see if the line is clear
from
the through bulkhead fitting (on the return) to the radiator. The car has a
185
thermostat in it and heats up to 185 when driving it on a cold night, so it
appears the thermostat is working right. I also have the electric fan set to
185. I am thinking about changing out the thermostat tonight, but I fail to
see
what this would have to do with the heater return line.
B B  B  Any ideas?

B B  B  -Bill in Tehachapi



B B