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97 965 Overheating under load 900

posted by  coverall on  Fri Aug 17 18:57 CST 2007
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last visit: Sat Aug 18 18:13 CST 2007
[RELATED]

I live in AZ, always hot or at least it seems so this time of year. Anyway, my 960 overheats under the following circumstances:
1. Drive 3000-3500 RPM for extended periods (75-80MPH)
2. On grades requiring additional power to maintain speed.
3. Cools down when slowing down
4. Cools down if heater is engaged
5. Normal "driving around town" does not pose a problem.

Here is what we have tried so far:
1. Fan - ensured fan runs both low and high speeds.
2. Fan relays - at first there was a question of whether or not the fan was kicking into high speed at the correct time.
3. Thermostat - replaced - several (in case one was bad)
4. Temparture sensor - replaced
5. Radiator & hoses - replaced
6. Head checked, valve job, head gasket replaced and timing checked.
7. Verified no bubbling occuring in reservior - there were small bubbles prior to head gasket replacement.
8. Airflow vent housings underneath in place and secured

Now we are scrtching our heads on what could be the cause of the overheating. Two ideas have been brought up, including:
1. The fan is going into high speed but is not acheiving total speed per spec.
2. Some sort of blockage in the exhaust system.

Has anyone run into this or have comments/recommendations?

Thank you all in advance,

coverall


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coverall(95/97 964/965)






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