You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
This is for my friends 4cyl. When I hook up a store bought diagnostic computer the fan comes on,( computer says system pass with engine on and off) but once off the fan will NOT come on no matter how hot the motor gets. I changed a/c compressor from a used 4cyl. and there is no freon in system does it need freon for the a/c clutch to engage or does that have anything to do with fan not working? Also took thermostat out so car doesn`t overheat.
This ad is not displayed to registered or logged-in members. Register your free account today and become a member on Mustang Forums!
The radiator fan should come on at a designated temperature. If that OBD1 scanner activates the fan, that mean the Relay side of the fan is working. I would look at the ECT sensor next. If your 100% sure the fan does not come on when the engine warms up, you need to find out why the control side isnt activating it. You will need to probably look at some wiring diagrams and go from there.
As a last resort, you could pun the fan on a switch if that would be easier for you to do.
I changed a/c compressor from a used 4cyl. and there is no freon in system does it need freon for the a/c clutch to engage or does that have anything to do with fan not working? Also took thermostat out so car doesn`t overheat.
when there is no freon or oil in the compressor the clutch won't engage it's a safety mechanism and taking the thermostat out can actually make it run hotter. you can always unplug the fan and hook up 2 jumper wires to it and the battery to make sure the motor isn't burnt up
__________________
91 mustang 5.0 lx,306 shortblock,E-303 cam,ported and polished E7's,rebuilt stock T-5,bbk E/L shorty headers,with their 2 1/2" o/r H-pipes,70 mm maf,3G alt.3:73 gears
85 mustang: parts car for now
Best time 13.7@ 102 mph 2.04 60' on street tires(in the '85)
Best time 14.3@ 96 mph 2.13 60' on street tires(in the '91)
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
cooling fan won`t engage
