I'm trying to diagnose if I have either a bad water pump, or
just a clogged heater core. The hose at the output of the
heater core has been spliced to insert a GM temperature
sensor in the line. [Other than the temp sensor splice, the
cooling system is stock.] The GM sensor is reading
correctly - it reads cold and the heater line *is* cold.
However, at the back of the head, the sensor which goes to
the dash reads very hot (after the engine has warmed up, of
course). It is as if there is no flow out the back of the
head.
Things I've tried:
0. Removed thermostat, put housing back. Still overheats.
Have new tstat, but have not installed.
1. Remove GM sensor splice, and inspect the inline housing.
Can see daylight through the hose connections.
Conclusion: temp sensor housing is not clogged and not
impeding coolant flow.
2. Added classic coolant flush tee in place of the inline
temp sensor. Flushed 12 gallons thru system. Pretty ugly
looking coolant, if I must say so. It still does not quite
look like clean water, but it is far more water like than
before.
3. Put back GM temp sensor.
4. Refilled with water. Installed a burp bucket on
radiator, ran engine. Filled bucket 1/3 way. Bottom rad
hose does not seem like it is full of coolant. Feels like
it is not uniformly hot. Tried squeezing hoses, etc to
burp. Not much happened with respect to coolant level.
Engine heated up - back of head sensor showed quite warm -
heater core loop quite cool to the touch.
What I'm going to do next:
1. Bypass heater core. Is there an 'easy' way to get these
hoses off? I cut them when I replaced them last summer.
Are they 'welded' on by now?
2. Maybe, flush core, if above works.
Anything else?
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