[flash-1295]

Does anyone know how to test the electric fan. The previous owner even installed a manual high speed swith but it is not turning on now. Checked the under hood fuse. Problem began a couple of days ago on a very hot day in traffic with a/c on. Overheated. Replaced temperature sensor and switched thermostats couple of times. Now have a 160 degree drilled in place. The fan was working the other day. Here is what I need to know. Does the gauge inside have anything to do with fan operation. The instrument cluster gauge is off. It starts below cold and overheats at the O in normal. Any possiblity of a connection. I don't think so because the manual swith is not turning it on either now. The air conditioner seem to make it overheat quickly. The idle does not seem to be increasing with the a/c on. There is no coolant leaking from the weep hole in water pump.

Any one have any ideas?

[flash-1295]

More questions here. I went out a couple of minutes ago and the fan came on when I turned on the a/c. Problem solved I thought. Then I went for a short drive and stopped after a few miles and checked. With the a/c still on the fan was not operating. Turned off the a/c and drove home. And the fan was working again. Does the high speed fan operate the entire time the a/c is on or just when needed. A real puzzler since the manual switch did not turn it on either. Thoughts?

[flash-1295]

Also there does not seem to be a ton of water pressure on the radiator return hose when I crimp it. Anyone have a water pump go bad with no leak from weep hole or noise while running?

[rich96cobra]

hey flash,

The way I understand it, when someone installs a manual switch, it works only one way. You cut the switch on and it cuts the fan on. You cut the switch off, the fan cuts off. The computer controls the fans at certain temperatures. coolant switch controls when the fans come on and off.

Now it sounds like you got some electrical issues where some "back yard" idiot tried to wire it and screwed things up. As far as the A/C goes, the A/C is on, the fans are on. A/C off, fans off (until a certain temp) is reached. But if the A/C is on, the fans are suppose to be on.

The water pump in mine went out, but the bleed or overflow started leaking. It still did not over heat though

Now, there will be some geeky people here that will throw out some better suggestions. But if the previous owner goofed up the wiring up (which I have seen) the smart mechanics here can only still throw out suggestion until someone looks at it.


Good luck,

Richard

[flash-1295]

Thanks for the reply. The strange thing is the switch seemed to be working fine till just recently. I am still fifty fifty about the fan or the water pump . I just don't see how the pump could quit working though. There is a little noise at first but I think it may be antifreeze on the pulleys. It quits after it runs a while. The fan thing is a real puzzeler though.

[flash-1295]

I have done some more investigation and think it might be the
CCRM (constant control relay module). I can hear it clicking when I turn on the manuel switch but the fan is not coming on. Since the fan works sometimes I think that might be the problem. Just wanted to post this for others with same problem to check.

[flash-1295]

10807 *
1996-1997 4.6l Mustangs And Mustang Cobras Exhibiting Concerns With Overheating During High Ambient Temperatures In Slow Speed, City, Or Stop And Go Traffic May Lack High Speed Cooling Fan Operation. All 4.6l Mustangs Are Equipped With A Dual Speed Cooling Fan That Is Controlled By The Constant Control Relay Module (ccrm). Check The Ccrm On Vehicles Overheating During The Described Driving Modes. The Ccrm Is Located In The Right Front Fender Cavity And Can Be Accessed By Loosening The Fender Splash Shield. The Correct Ccrm For The 4.6l Mustang Will Have A White Label With The Part # F6sf-12b577-aa Written In Blue Ink. Also, Make Sure The Vehicle Has The Air Deflector (8326) Installed. In Ambient Temperatures Above 90 Degrees (f) It's Not Uncommon To See The Needle On The Temperature Gauge At The Letters "m-l" In The Normal Range. This Type Of Reading Alone Does Not Indicate An Overheating Condition And Should Be Considered Normal.
Effective Date: 07/29/1997

[flash-1295]

Always check the fan first. lol Pulled wire from fan and it had shorted. Problem solved.

[Flame]

I had the same problem, I read online and my local Ford dealer told me that this year model runs warm anyhow. Said that was normal, mine runs on M or A on the gauge even at highway speeds. I thought that there was something fishy about that, so I started researching online. I found about 300 or so other people who had the same issue. Just about all said that Ford put to small of a radiator in from jump. They allso said that there fans dont come on till 260 degrees, set like that from the factory. Dont know if it is true, but I got the info off some consumer complaint link listed in the Kelly blue book site. Again, dont know how accurate it was, but a new radiator solved my problem. It stays just on the R now. I live in Ga, and it gets pretty hot here in the summer.

[flash-1295]

Thanks for the info. Radiator was already replaced so it really had me puzzled. Just put in the new fan and that seems to have solved my problem.