93 FD Cooling Fan Operation
05-20-17, 01:26 PM
#1
93 FD Cooling Fan Operation
Hello,
I'm a new owner of a 93 FD and have a question about cooling fan operation. I've driven it several times now but have yet to notice the fans coming on. The outside temperatures have been cool (40-50 deg) and I haven't driven it at extended high speed but is this normal? I've also let the car idle for a long time with no fan operation. The temperature gauge always comes up to normal. I've read much about overheating so want to a make sure the fans are working properly. The car is stock except for downpipe and slightly larger radiator. Any insight is appreciated.
Thanks
I'm a new owner of a 93 FD and have a question about cooling fan operation. I've driven it several times now but have yet to notice the fans coming on. The outside temperatures have been cool (40-50 deg) and I haven't driven it at extended high speed but is this normal? I've also let the car idle for a long time with no fan operation. The temperature gauge always comes up to normal. I've read much about overheating so want to a make sure the fans are working properly. The car is stock except for downpipe and slightly larger radiator. Any insight is appreciated.
Thanks
05-20-17, 02:11 PM
#4
With that low of ambient, moving down the road with good air-flow and the larger radiator it's probably normal. The stock fan thermoswitch temperature threshold for low speed is 108 C. (226 F.)...which is kinda high. I recommend the S5 FC thermoswitch which lowers the threshold to 96 C. (205 F.)
Sitting and idling it might take a few minutes.
If the car is completely stock I strongly recommend adding two gauges...Boost and a Temp gauge. DO NOT rely on the stock temperature gauge. It's not linear...it goes to just below half way from (IIRC) about 180 F. and stays there until about 240 F. So if it ever moves above that, it's almost too late.
Sitting and idling it might take a few minutes.
If the car is completely stock I strongly recommend adding two gauges...Boost and a Temp gauge. DO NOT rely on the stock temperature gauge. It's not linear...it goes to just below half way from (IIRC) about 180 F. and stays there until about 240 F. So if it ever moves above that, it's almost too late.
05-20-17, 10:34 PM
#5
Cool. Another addition to my to do list. Nothing is better to me than an easy improvement using a relatively low cost stock part from another model. Are there more tricks like this? And yeah I have the gauges on my list. I'm also thinking of adding the second oil cooler...
Thanks for the info and advice. It is much appreciated.
Thanks for the info and advice. It is much appreciated.
05-21-17, 08:01 AM
#6
For a lot of other ideas take a few evenings and stroll through the FAQ sticky at the top of this (and the 3rd Gen. Tech) section. It's hard to imagine that an issue or question you might have on your car hasn't already come up previously and been dealt with. The forum is a great resource if you learn how to search.
*There are other valid ways, but for the temp gauge sender install, this location has been great for me over the years: https://www.rx7club.com/3rd-generati...d-idea-392910/ . I think the list of fittings is on post #37 or so. I put mine there way back in the day when my car was still very stock. I've since removed AWS but I kept that hose and still use it for my temp sender today.
When it was stock:
*Get some upholstery foam and plug the gaps around the face of the radiator and IC duct. Just look through the nose of the car with a flashlight and you'll see what I'm talking about.
*Use as much distilled water to coolant as you can safely get away with in your climate.
When it was stock:
*Get some upholstery foam and plug the gaps around the face of the radiator and IC duct. Just look through the nose of the car with a flashlight and you'll see what I'm talking about.
*Use as much distilled water to coolant as you can safely get away with in your climate.
