Quote:
Originally Posted by hk20000
So what is a proper range for the aux fan to be triggered by hot radiator? 100C or even higher? Because I was there when the mechanic is hooking up the freon the fan only started spinning when the water temp gauge is pointing a bit higher than 100 (say 105?) And that's a bit late and discerning.
Coolant temp cut-in spec is 105C
Many guys lower this by putting a resistor accross the coolant temp sensor.
likely to be caused by low freon level, yes?
Yes..that is why I mentioned the jumper test. I suspect you have no fan for a/c pressure system. Do the test to find out ...
The fan does run I'm just a bit concerned about how it is activated as late as 105C coolant temp. Is it also normal that every time u start the car from a long term parking the fan comes on momentarily (for about 20 seconds or so) for self testing?
that's the major concern here, yes. Why is the fan activated so late if the A/C is off? 105C? That's alarmingly high compared to many cars I have touched.
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That is normal spec for that car..remember , the fan is only an aux aid to control extreme thermal taxation of the system..it is not there for normal operation..only when it is needed , as in high ambient temps , towing, stop/idle in traffic, etc. If it is not called for , it just does not come on.. but if your a/c fan is not coming on , then the coolant suffers the burden and that triggers the high fan. These are BOTH only system aids in controlling
temps and pressures when they are being taxed by adverse conditions..you can run an a/c all day long and never see the fan being called for b/c the high-side never gets into a high thermal load condition..see that all the time in Moderate climates..but in Fl, the fans should come on right away b/c of the high ambient temps/conditions ...so, if you have high ambient temps and the system does not get to high side pressure trigger spec, it that can have an effect on the coolant temp.... and this can be caused by a shortage of refrigerant...[enough in there to get the cond hot , but not enough to trigger the high pressure switch] ..so, do the high pressure sw jumper test to see if that fan even works......could be a simple as a fuse .
VERIFY FAN OPERATION......
You may have no problem at all, but I would want to know if fans are working when they should..
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