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One thing you haven't tried is removing the thermostat to see if that helps at all. It's just possible that your t'stat is sticking, causing the temp. to rise quickly and drop again. Test the t'stat...

Sounds like your temps. are OK and from what you've described, if you do have a head leak it's so tiny not to be a concern at this stage. All seems to be well as far as I can see though it wouldn't...

The coolant's probably leaking from the water pump weep hole and that happens when the pump shaft bearings wear out and the seal is broken. The only other possible source in that area is the...

I forgot to mention hood vents. Yes, they're a good idea 'cause releasing all that pressurized hot air from the engine compartment will allow more cooler air to flow through the radiator. That is,...

Well I haven't a clue what the A/F ratios are at various coolant temps. except that I know the engine runs rich with more timing advance when the engine's cold. At 160*F the PCM has already gone into...