Hey guy. Phil here. I know someone out there smarter than I will have some know how for me.
I have had my 95 lt1 for a few weeks. All has been great. Car runs amazing. Tonight when I pulled into the drive way and turned the car off and got out I noticed the cooling fan was still running. (Note this is the first time) I walked back out 30 or so minutes later to it still running. I pulled the fuse for an easy fix to turn the fan off. It came right back on if I replaced the fuze. Mind you the car was driven home with no a/c and windows down. I pulled the temp sensor on the water pump and re-plugged it back in. Then after putting the fuze back in the fan did NOT turn on. I then started the car and shut it off after a minute or so....fan stayed on again.
Im not sure what the issue is. Does anyone have some advice? I read a lil on a similar issue but none stated the fan stayed on after shut off. Most were (constantly running) fan issues.

Please and and thank you!
Phil

 

Any help will be greatly appreciated!!



Hey guys. Phil here. I know someone out there smarter than I will have some know how for me.
I have had my 95 lt1 for a few weeks. All has been great. Car runs amazing. Tonight when I pulled into the drive way and turned the car off and got out I noticed the cooling fan was still running. (Note this is the first time) I walked back out 30 or so minutes later to it still running. I pulled the fuse for an easy fix to turn the fan off. It came right back on if I replaced the fuze. Mind you the car was driven home with no a/c and windows down. I pulled the temp sensor on the water pump and re-plugged it back in. Then after putting the fuze back in the fan did NOT turn on. I then started the car and shut it off after a minute or so....fan stayed on again.
Im not sure what the issue is. Does anyone have some advice? I read a lil on a similar issue but none stated the fan stayed on after shut off. Most were (constantly running) fan issues.

Please and and thank you!
Phil[/QUOTE]

 

Hope this helps. The pages may not be in the correct order but you should be able to see the page numbers.

 

Your 95 has 3 relays that control the fans. They are located on the drivers side of the radiator fan shroud. The pages provided to you by ajd3rd are from the factory service manual and describes the diagnostic procedure to check the function of the relays. It may well be that one of the 3 relays is bad or one of the wires has come loose.

 

Thank you so much guys. I pulled relay 1 and found a definite fault. One wire ( Blue ) was burnt pretty badly. And on the fuse side as well. I will add the pictures. At this point I know I can replace the relay, but do I just clean the connector side? Or can I replace that as well? What do you suggest?
thanks again guys!! What a family corvette owners are. I really do appreciate your time.

Burnt on top right prong.

Lower right inlet

 

So what I’m finding on Eklers and CC is f5 pin. My relay is a 4 pin. Can I use the 5 pin relay?
heres what I’m finding 👇🏻

 

If it were me, I'd be looking for a new connector.

 

Great news! Found a replacement. Required the new connector and put in new relay. All is well!!
Thank you guys for your help and input. It was a true help.
Phil

 

Im having an issue with what appears to be high speed not working. I have a tech 2 and am going to be storage to retrieve it but I dont think I will find my factory manual (who knows but doubt it). On the supplied PDF the tests refer to relay, 1,2,3, Can someone tell me which is which/? I have 4 of them in the area as you can see by the attached photo.

I got stuck in traffic and noticed my temp almost got to the warning area.. please tell me I didnt warp my heads...

EDIT: I should have mentioned, both fans run but low speed and nothing stays on when I shut the car off and they used to. I also had lowered my fan run temp.. cant remember to what.. Hopefully can find my jet programmer too. Moving sucks.

EDIT EDIT: I checked all 3 fuses. one in the passenger door, and the two big boys in the engine compartment.
Edit again: Can someone tell me how to pull the relays without breaking the plastic tabs? It looks like there is a cover and the actual connector can be removed as well?? Weird.

 

Well I found my manual but cant find my tech II which really sucks for this. Tested all three relays and all are good. What was weird is I found 12v on each side of the coils on 2.. but then after reading the manual I think thats there for testing the circuit to make sure its complete. Then the PCM ECM whatever takes it to ground when it meets the temp.

Both fans run in slow speed with AC on in a cold car now.. they shut off when I turn off ac. If I remember right both fans ran slow AC on or off when I got home.

I didnt realize in the 96 there is a sender for the analog gauge (head) and sender on the water pump for digital. When my gauge was at 3/4 I failed to look at the digital gauge to verify. As long as I kept moving the analog dropped to normal. Im starting to suspect one of the two senders is bad, This past summer the fans ran on high almost always, AND this is the first time Ive driven in the winter without the HVAC in auto.. so maybe that is the issue as well, the fans werent running even in low because AC was off.

My water pump was replaced just before I bought it.. I sure hope it isnt bad.

So basically Im pretty confused now.I will take it for a drive tomorrow and leave the hvac in auto and see what happens and also check the digital gauge against analog. I dont know why my compressor runs when its 40f out. I cycles so maybe freon is low.. Gotta research that. thats why I took it out of auto hvac.

If anyone with a 96 can chime in on this id appreciate it. When I really need the tech 2 I cant find the darn thing.

For those wondering #2 and #3 are on right top being #2 I believe.

 

I feel like I'm talking to myself here but in the spirit of contribution here is what I found. My car is fine, I was driving with settings I was not familiar with, I normally have my HVAC in auto but because my ac was cycling I went to manual and It appears the fans arent easily set to high mode in this condition. I was never able to determine if the fans would go to high because I didn't want to run my coolant temp up. I also found that there is a 15-degree discrepancy between the analog and digital gauges. The digital is 15 lower. Im not sure which is accurate but Id sure like them to be the same. In manual HVAC my car when moving lives around 200f digital. If I stop and let it idle it will run up quite a bit (forget how I high I let it go).. but as soon as I turned on auto I heard the fans go from low to high and the temp dropped.

I dont know if this is by design or not but I'm going to look into this and see if I cannot make it work the way I want. No need to run to what is close to the shaded area of analog while not moving. So essentially this was a big nothing and based on reading posts pretty par for the course on the 96. I also probably need to fix the leaking valve in the ac. Bought a tool but it doesnt fit to remove it.

Went for a nice 1 hr drive and all was fine. The drama continues in maintaining this old thing and worrying about it.

 

I just wanted to point out a couple of things: The temp sensor on the passenger side of the engine is used to send a signal to the analog gauge only. That signal is not used for anything else. My understanding is that it is the signal from the sensor by the water pump that provides the temp for the digital readout and this signal is also the one that goes to the PCM and is used for all other related functions.

The analog gauge is not considered to be accurate and should only be used for "general reference". On my 95 LT1 both fans default to high-speed mode when the AC is turned on.

I believe that all of this is the same on the 94 - 96 LT1.

 

Yes this is correct (two sensors). However, some say the analog is not linear.. that is not what I found. I found it to be quite linear, just 15 off of digital. I mean within reason as I can only go by what is marked but it sure looked linear. The first unmarked mark in mine is 200f on digital.I thought there was something unique about the 96 but sounds like not so much. I suspect if I put in both new sensors Id get the same result but who knows. I am tempted to replace the digital sensor with something high quality because if it malfunctions it would likely be catastrphic (blown gasket and or warped heads). Pretty cheap insurance if you can establish what a "good one" is.. I suppose dealership part to be sure.

In my car when turning on ac it DOES NOT default to high mode. It has to reach a certain temp which I dont know what it is before it goes to high. I verified this.. ran ac when the car was cool and they were both in low. But they do default to ON... just not high necessarily.

 

In my FSM (for 95) on page 6E3-C12-10 it states that:

1) the PCM will command both fans to run at low speed once the digital indication reaches 226F (and turn them off once the temp lowers only 5 degrees at 221F)

2) If the digital temp reaches 235F it commands both fans to switch to high speed (and turns them off --- from highspeed--- once the temp lowers by 5 degrees to 230F).

I'm not positive that this is the same for 1996 but don't see why it would be different as these systems did not change between 95 & 96.
Hope this helps!

 

Thanks.. I dont seem to have the "6e" pages in my factory manuals.. I need to dig some more. I was looking for those last night. I lowered mine but for the life of me cant remember to what.. My programmer is MIA so have to find it.