Help! Cooling Fan(s) Help Needed

[CAJUN C4]

My 95's Left Fan is not coming on. When I first purchased it it acted up sometimes it would run and sometimes it wouldn't.I changed all 3 Relay's.Worked fine and I thought I had fixed the Problem. Yesterday with the A/C on the Temp. started to creep up as I was in traffic.Got to 215F.
I stopped and opened the hood and sure enough, the Left Fan was not running. This morning I checked it and the same thing ,No Left Fan.Right side is running on Low and High speeds.Someone along the way,as I am the 3rd owner,re-set the fan's to come on primary 184 and secondary 195 without changing the stock 180F Thermostat.The Fan's have been running forever all the time. I suspect it's the Fan Motor? Am I on the right track as I changed all 3 Relay's.Could it be a PCM Issue? The Right side comes on High when I turn on the A/C.

 

[vetteoz]

Thermostat temp should have no effect on fans; once it is open you have full flow.

 

[CAJUN C4]

I agree...What I meant was that for I don't knoe for how many years my Fan's have been running and not being able to turn off because of the Lower Settings someone made keeping the stock 180F Thermostat..

 

[Hib Halverson]

Some observations:

With the fan-on temps lowered to 184 and 195 and using a 180 thermostat, the fans will probably run most of the time.

215 is not really hot but that doesn't mean one dead fan is not problem.

Given your description of fan operation right now, I'd say that left fan motor is not inop. or the power feed to that fan is faulty.

Pull the left fan and test it.

 

[CAJUN C4]

Some observations:

With the fan-on temps lowered to 184 and 195 and using a 180 thermostat, the fans will probably run most of the time.

215 is not really hot but that doesn't mean one dead fan is not problem.

Given your description of fan operation right now, I'd say that left fan motor is not inop. or the power feed to that fan is faulty.

Pull the left fan and test it.

Thanx Hib..You have a Test Procedure? Maybe a certain amount of ohm's accross the contacts? Should I get 12 V at the Motor? I know it's a 2 speed.

 

[Hib Halverson]

Thanx Hib..You have a Test Procedure? Maybe a certain amount of ohm's accross the contacts? Should I get 12 V at the Motor? I know it's a 2 speed.

First thing I'd do is pull the wires from the left fan and see if you've got power there. I'm not sure how the circuit works but I'll bet it works when the relay grounds the fan circuit so you may have to test for power when the ECM commands fan-on.

Either connect the battery direct to the motor and see if it runs or take the motor out and connect to a 12-volt power supply. Don't forget to observe polarity.

The motor is not a "2-speed" per se but the ECM varies the supply voltage between one of two values to produce the high and low fan speeds.

I'm talking "off the top of my head" because I didn't have time to research this in my 95 FSM. If you have the manuals, I'd read them first.

 

[CAJUN C4]

Will Do

Thanx Again Hib

 

[JimBobC4]

The motor is not a "2-speed" per se but the ECM varies the supply voltage between one of two values to produce the high and low fan speeds.

I'm talking "off the top of my head" because I didn't have time to research this in my 95 FSM. If you have the manuals, I'd read them first.

CAJUN C4 I have a 1995 FSM at home if you need a circuit description and a maybe a diagram or two Won't be home till this evening though.

 

[CAJUN C4]

CAJUN C4 I have a 1995 FSM at home if you need a circuit description and a maybe a diagram or two Won't be home till this evening though.

Thanx Jim Bob

I also have one.I'm new to using it though. I'll see what I can find tonight as well..I'll give you my E-Mail address if you need it.

Thanx again

BTW I did check how to replace the Fans looks like they come out from the bottom. You have to remove the Skid Plate / Rails ????

 

[CAJUN C4]

Some observations:

With the fan-on temps lowered to 184 and 195 and using a 180 thermostat, the fans will probably run most of the time.

215 is not really hot but that doesn't mean one dead fan is not problem.

Given your description of fan operation right now, I'd say that left fan motor is not inop. or the power feed to that fan is faulty.

Pull the left fan and test it.

Hib:I'd pull it to check but the FSM says jack it up and remove the Skid Bars from the bottom so it looks like they are removed from the bottom???

I wonder how difficult a job it is???

 

[Hib Halverson]

I've never had to remove my fans so I can't answer the question very well.

Consult the Factory Service Manual for fan removal.

Also, are you sure you're looking at the FSM and not some non-factory repair manual. I don't remember my C4 as having a "skid plate".

 

[CAJUN C4]

I've never had to remove my fans so I can't answer the question very well.

Consult the Factory Service Manual for fan removal.

Also, are you sure you're looking at the FSM and not some non-factory repair manual. I don't remember my C4 as having a "skid plate".

Yes Hib In Sec. 6B It refers to removing the 2 Skid Pads / Plates,Take off Radiator Shroud etc.

I believe they come out from the bottom.

 

[jmccloud]

'95 radiator fans

On a '95 the two fans are wired in series for low speed (that means there are 6 volts across each fan). For high speed the fans are wired in parallel so there is 12 volts across each fan. The fan relays accomplish this. So if you've got only one fan running in low speed, the other is conducting but not turning. If you've got only one fan running in high speed, one fan is dead or has bad wiring for the 12 volt feed.
Since your car was modified by the previous owner, the above may be poppycock. The only way to tell is test each fan.
A resistance reading will not tell you much, the coil in the fan motor will read 0 ohms or so close to it that specialized equipment would be needed to get an accurate reading. The easy way to test the fans is to wire 12 volts to each fan separately (disconnect the harness plugs) and see if they run. If both run, test the fans in 'low speed' or 6 volt operation. Use wire leads to connect the two fans in series and see if they will run with 6 volts across each (harness plugs remaining disconnected). To wire the fans in series, connect one lead of fan A to the +battery, connect the other lead of the fan A to one lead of fan B, connect the second lead of fan B to the -battery terminal.
Hope this is clear enough (I'd be glad to try again if not, please ask).
I expect that you have a fan with shot bearings (it may run with 12v but not 6v) or a real wiring screw-up by the PO.
Good luck

 

[CAJUN C4]

Thank you so much

I'll do these test's and let you know. I really think it's a bad motor.It won't run at all...Low or High. I believe it comes out from the bottom.

Thanx J

 

[jmccloud]

'95 cooling fan removal

Sorry for the late info; the wife is having the carpets replaced and the whole house is 'tossed' so it took a while to find the FSM.
You should be able to diagnose the fans without removing them. But if they must come out, here it is. Yes they come out the bottom. Be careful jacking and supporting the car.
The skids are part of the 'air bag system' so take care to disconnect the battery, etc.
The front 'skid plates' and fascia don't have to come off, only the 'skid bars' directly under the fans (I didn't even know the were there). The bars are sort of a rearward extension of the plates.
There are two bolts to the rear of each bar holding it to the trans oil cooler (only about 5 ft-lbs torque so be gentle) and one bolt holding the front of the bar to the back of the 'plate'.
The passenger side fan comes out first then the driver's side with the shroud.

Good luck.

 

[CAJUN C4]

Thank you very much. Now,your saying the top Radiator Shroud doesn't need to come out?

 

[jmccloud]

'95 cooling fan removal

Thank you very much. Now,your saying the top Radiator Shroud doesn't need to come out?

Sorry, I was so focused on the 'skids' that I didn't go back and check the fan removal starting point. Yes, it says to 'remove or loosen' the 'upper radiator support' (what I would call a shroud) that's in front of and above the radiator. What the FSM calls a shroud is the rectangular surround of the round fans that sits behind the radiator. That 'shroud' is the other item on the 'remove or loosen' list.
Looking at the actual car, there's a cross beam behind the fans that prevents the driver's side fan from moving rearward enough to clear their shroud. So all the other stuff (support and shroud) must move forward a couple of inches to allow the driver's side fan to clear the shroud. The passenger side fan has more room (it's lower) except for the A/C collector that would be easy to move. Big PITA to even loosen that upper radiator support!
But I'd bet that you could unmount and lift the A/C collector (don't disconnect it's plumbing) then drop both fans and shroud out the bottom as a unit. After removing the 'skids' of course.
Hope this helps more that confuse.

 

[Hib Halverson]

Yes Hib In Sec. 6B It refers to removing the 2 Skid Pads / Plates,Take off Radiator Shroud etc.

I believe they come out from the bottom.

Ok. I get it. By skid plates you mean those things I call "supports" which run under the front of the car. I guess they could be called skid plates, skid bars, crash bars or whatever.

In any event, I figure you have either a bad fan motor or a wiring problem.

I'd take others' advice and test the fan first before I'd remove it.

 

[CAJUN C4]

Thanx Guys for all your help

Dennis

 

[CAJUN C4]

We got em changed out.We took them out from the top also.Completed in 1 hr. 45 min.