Re: '85 GT cooling probs

[zm@mhcnet.att.com (Zafer Mehmood [209])]

Eric,

Considering that you have problems with the temp fluctuating, here are some
obvious items to rule out (you may done this already):

- Operation of the radiator cooling fan. This could be turning on/off at
the wrong times or running at the wrong speed. This can easily create the
symptoms you describe. The thermoswitch that determines the engine temp
and turns the fan on/off could be flaky. I would suggest checking the Bentley
manual for specifics.
- If this checks out ok, try replacing the thermostat.
- You mentioned adding fresh coolant recently. Is the coolant concentration
still within spec? High conc of coolant reduces its heat dissipation properties.
The conc should be about 50% with protection down to -38 F.

Hope this helps,

Zafer

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Zafer Mehmood				   AT&T Bell Laboratories
zm@mhcnet.att.com			   Murray Hill, NJ