| Author | Message | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 31 Registered: 12-2002 |
Bill, good point!!! Now I need to go and check that out too. | ||
| Bill McAlister (Wmcalister)
New member Username: Wmcalister Post Number: 14 Registered: 9-2001 |
had an overheating problem and found that one of the fans was turning the wrong way. No idea how that happended but reversed leads and rotation was corrected and cooling worked. | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 28 Registered: 12-2002 |
Well I hooked them back up today and all worked according to plan. The past owner must of bypassed them just to keep them running all the time? Car did not over heat. Right fan came on with AC and both came on when it got to 185' or aroung there. Thanks for all your help. Richard. | ||
| Dr Tommy Cosgrove (Vwalfa4re)
Member Username: Vwalfa4re Post Number: 515 Registered: 5-2001 |
DeMarzo, It doesn't matter which way you hook it up. The plug just completes the circuit at the correct temp. Thats all. | ||
| Philip Airey (Pma1010)
Junior Member Username: Pma1010 Post Number: 126 Registered: 7-2002 |
Mario Sounds normal given the operating range which causes the fans ot come on/cycle off. Philip | ||
| mario navetta (Mar308)
New member Username: Mar308 Post Number: 1 Registered: 2-2003 |
My 308QV cooling fans cycle normal in the winter months, in the warmer months once they come on they stay on. Is this normal? | ||
| Mike Dawson (Miked)
Junior Member Username: Miked Post Number: 75 Registered: 2-2001 |
I had the same type of experience as Hans. Back about 1970 a friend had a Mini Cooper that would occasionaly severely overheat. There was no particular pattern to the overheating and sometimes the temperature would return to normal just as fast. We did the usual things, replaced the thermostat, flushed the radiator and even removed the thermostat. For 6 months nothing fixed the problem. We finally pulled the radiator (no easy task in a Mini) and found a cork stopper floating in the bottom tank. Apparently it would float around and block the hose outlet enough to slow the coolant circulation. Without the cork the car never overheated again. | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 27 Registered: 12-2002 |
You are right. The plug is still in, wires I think have been but together. I hope they are the right wires. Could be a reason for that. I guess the only way to find out is to hook them up. Does it matter which wire goes to which terminal. If so I have a 50/50 chance to get it right the 1st time. Will let you know when I complete. S/B easy to tell if its working or not!! | ||
| Hans E. Hansen (4re_gt4)
Member Username: 4re_gt4 Post Number: 868 Registered: 4-2002 |
DeMarzo: Are you sure yours is missing? They would have had to insert a plug in its place. The wire you found is probably guilty part. | ||
| JRV (Jrvall)
Member Username: Jrvall Post Number: 921 Registered: 11-2002 |
Low Temp or Normal 2 Prong Fan Switch for 944 Porsche (1985) from NAPA or BAP-GEON. Normal Sw. turns on @ 187Fdeg-92Cdeg LowTemp Sw, turns on @ 173Fdeg-85Cdeg | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 26 Registered: 12-2002 |
I guess I need to Ferrari part number. Does anyone or could anyone take a picture just to make sure I know what i'm looking at? Grazie, Richard | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 24 Registered: 12-2002 |
Okay, Fan runs all the time. Were is the radiator fan temp switch? I see a wire that has been jumped on the right side next to the head lights. Like JVR said. That's probably were it went. Any idea were part number from local auto parts store. | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 23 Registered: 12-2002 |
Okay, Fam srun all the time. Were is the radiator fan temp switch? I see a wire that has been jumped on the right side next to the head lights. Like JVR said. That's probably were it went. Any idea were part number from local auto parts store. | ||
| Frank K Lipinski (Kaz)
Junior Member Username: Kaz Post Number: 139 Registered: 11-2002 |
You guys blow me away with your knowledge and expertise... BTW - Hans I keep your "Will work for tune up" pix handy when I need a picker upper... | ||
| Rob Schermerhorn (Rexrcr)
Junior Member Username: Rexrcr Post Number: 230 Registered: 11-2002 |
Wiring in a switch is actually an authorized 348 Challenge modification. We received a technical bulletin outlining exact procedure. The factory is concerned about feedback into the ECU, so the switch had to be wired right or poof goes the ECU. I'm sure there are other ways, and I'm sure Billybob has figured this one out, too. The theory is that the aero of the 348 is such that even at speed, the fans must be on at all times, there were cooling issues with the race cars, and this is one solution. Other was cutting out the fiberglass louvers in the rear wheel wells and replacing with heavy duty wire screens to improve the exit flow of the heat exchangers. There was also additional oil coolers, but I digress from the original post.  | ||
| Hans E. Hansen (4re_gt4)
Member Username: 4re_gt4 Post Number: 866 Registered: 4-2002 |
Frank: The car originally had an overheating problem that they couldn't fix. New engine thermostat, lower rad temp switch, etc. The fan switch was yet another attempt at a cure. The ultimate problem: They pulled the radiator to have it flushed and found that someone at the factory had put a length of heater hose inside the radiator hose, thus restricting it. Removed it and no more problems. Sabotage!! (sp) And, yes, it was apparently hard on the fan motors. Both quit at the same time this last summer. | ||
| Frank K Lipinski (Kaz)
Junior Member Username: Kaz Post Number: 138 Registered: 11-2002 |
LOL Hans...so now he tells you..... Not a bad idea, but seems like a lot of wear on the fan motor and from what I understand, they ain't cheap to replace.. | ||
| Frank K Lipinski (Kaz)
Junior Member Username: Kaz Post Number: 137 Registered: 11-2002 |
Rob - You are so correct!  Recovers fine..actually overcompensates at times...Varooom..sounds real healthy... | ||
| Hans E. Hansen (4re_gt4)
Member Username: 4re_gt4 Post Number: 864 Registered: 4-2002 |
My car has a 'mystery switch' under the dash. Being a little paranoid, I was afraid to touch it. However, I did notice that my fans ran all the time. After finding the phone # of the original owner, he asked, "Did you find the fan switch I put under the dash?" He simply wired the switch to short together the radiator temp switch. | ||
| Rob Schermerhorn (Rexrcr)
Junior Member Username: Rexrcr Post Number: 229 Registered: 11-2002 |
Frank, as far as the dip in engine revs when fans cycle on, you've got the right answer. It is the transient load on the electrical system, and the idle speed motors must "catch" the dip, this takes a moment, not instantaneous. It will dip, then over-compensate, then stabilize. The system does recover though, yes? | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 22 Registered: 12-2002 |
Both fams come on when the key is on. I will check to see if they are plugged together. | ||
| JRV (Jrvall)
Member Username: Jrvall Post Number: 919 Registered: 11-2002 |
When both fans come on when key is turned on the radiator fan switch wires have been jumpered/plugged together. Done to test fans or when the radiator fan switch (lower right corner of radiator) has gone bad. When replacing the fan temp switch it's not a bad idea to install a lower temp version...in all warm/hot climates. Keeps water temp more under control and helps AC blow cooler. | ||
| Randall Booth (Randall)
Junior Member Username: Randall Post Number: 88 Registered: 1-2003 |
Demarzo- Do both the fans come on when your key is in the "on" position? My car does that, and I'm pretty sure it's not right. | ||
| Matt Lemus (Mlemus)
Intermediate Member Username: Mlemus Post Number: 2077 Registered: 8-2002 |
DeMarzo, Are you sure it's the fans and not the blower? I am asking because you did not say that you SAW the fans running. If it's not the fans then your blower is running. | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 21 Registered: 12-2002 |
Thanks, Thats what i thought. Now it's time to go and figure what's up. | ||
| Frank K Lipinski (Kaz)
Junior Member Username: Kaz Post Number: 136 Registered: 11-2002 |
Not the A/C John...had it off cause I had the top down. Hate to say this, but the traffic jam was on US 1 along the beach. Top Down, blue sky, babes everywhere & people just gawking at the car! Life is good...  I'm thinking possible too heavy load on alternator or something...I think the fans draw a lot of current and the car has a 100 watt amp...not sure  | ||
| john beaucher (Spider348)
New member Username: Spider348 Post Number: 28 Registered: 11-2002 |
Frank, Possibly your AC cycling at the same time, creating an additional load? No sympathy here Frank, your temps 80F. My 348 spider is hibernating in MA, current temp 8F! | ||
| Frank K Lipinski (Kaz)
Junior Member Username: Kaz Post Number: 135 Registered: 11-2002 |
OK - Not to hijack this thread, but I have a fan question also on a 355. Yesterday the temp was in the low 80's and I was stuck in a MAJOR traffic jam for about 30 minutes. The car temp goes up to about 190, then the fans kick in just fine. However, what what I noticed is that when they first kick in the engine will "lug down" for a few seconds, then the ECU seems to correct it. Doesn't make sense because the fans are driven by elec, not a pulley on a belt like an A/C pump.. Anybody have any insight on this? | ||
| Mike Procopio (Pupz308)
Junior Member Username: Pupz308 Post Number: 95 Registered: 10-2002 |
Hey DeMarzo--I did a quick search, since I wasn't 100% sure myself how the fan logic works out, but here you go: http://www.ferrarichat.com/discus/messages/112/167154.html 1. Coolant cold, AC off -- both fans off 2. Coolant cold, AC on -- RH fan runs 3. Coolant warm, AC off -- both fans run 4. Coolant warm, AC on -- both fans run To test them, check out: http://www.r-design.net/308/techtip3.htm The general idea is, until your coolant warms up (approx 195F), the fans should be off. Also, no matter what, with the air conditioning on, the right hand fan should be on. First, be happy that both of your fans *do* run. Second, it sounds like, almost for sure, this is a problem with the thermostat that controls (directly or indirectly) sending power to the fans. It should engage above a certain temperature (run fans), and cut off at a lower temperate (don't run fans). The link above has gives the specs and a procedure for testing the thermostat. --Mike | ||
| DeMarzo (Demarzo)
New member Username: Demarzo Post Number: 20 Registered: 12-2002 |
Just an question about the radiator fans, Should they be on when the car is running? I think they shouldn't and only when the temp is high or the ac is running. Anyone know the correct anwser. My 308 seems to run all the time. |