Core flushed clean. Apparently not the problem. Any other
ideas?
-Bruce
On 4/10/2011 4:34 PM, Ken Bogart wrote:
I would flush the heater core to verify flow. If its
blocked and needs replacement, a temporary bypass will
certainly work to keep you on the road.
Ken Bogart
-----------------------------------------------------
96 Montego Blue FFS Coldside (His)
97 Black & Tan (Hers)
90 Crystal White (sons)
------------------------------------------------------
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On Sun, Apr 10, 2011 at 2:32 PM, Bruce Labitt
<[email protected]
<mailto:[email protected]>> wrote:
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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