Could be a couple of things:
You stated that the "fanS" were working, but it could be that the high speed fan is working only. If the low speed fan is not working it will reach a higher temp, then high speeds come on, lowering it.. cycle, cycle, cycle.
Another is WP failure (or partial failure)
When replacing (25 minutes for the impellar half only..)
use a revised white plastic impellar or metal impellar.
(Some metal ones have had leaking problems around the shaft. yeah, I've seen a white one fail too, but I can count THOSE on one hand...
I would opt for the white impellar everytime.
~60 for a new impellar housing and belt/gasket. remove, clean the old gasket material off the car... apply new gasket and mate together... done.
top off with coolant mix, and enjoy.
(if this fixes your problem, you're done. If it is the same, then don't be discouraged, as you NEEDED to replace it, either way.. HAVE to.. lol)
then you can look at the low speed fan relay, or the connector may have come undone.
Ray
