05 LS2 Engine Tempature

[blbrownssr]

I have a question about the running tempature and Idle tempature. The car is 05 SSR automatic the elevation is over 6000 feet above sea level. I complained to Al Serria Chevrolet that during warm summer days (high 80's to low 90's) that during a stop light cycvle the tempature would reach 240 degrees. I also informed them that the fan was running very slow and quite. They checked the computer and found no record of it overheating (well duh), I didn't let that happen. I was also told the fan is a single speed fan. I have two other cars that have electric fan and they both sound like a jet engine when they run but not the SSR. During normal driving the tempature stays a little below 210 degrees and that's with the air on.

Any feedback would greatly appricated.

I haven't post a picture of the SSR yet but it will happen.

[WOW_FCTR]

Originally Posted by blbrownssr

I have a question about the running tempature and Idle tempature. The car is 95 SSR automaticn the elevation is over 6000 feet above sea level. I complained to Al Serria Chevrolet that during warm summer days (high 80's to low 90's) that during a stop light cycvle the tempature would reach 240 degrees. I also informed them that the fan was running very slow and quite. They checked the computer and found no record of it overheating (well duh), I didn't let that happen. I was also told the fan is a single speed fan. I have two other cars that have electric fan and they both sound like a jet engine when they run but not the SSR. During normal driving the tempature stays a little below 210 degrees and that's with the air on.

Any feedback would greatly appricated.

I haven't post a picture of the SSR yet but it will happen.

I'm guessing you hit a '9' instead of '0' in your post making it an '05 SSR....
It's a two speed fan...

I would suggest that you use the search box in this forum and read as many posts as you can because there is an awful lot of info on the fans including 2 people (at my last count) selling replacement fans and/or auxillary fans.

Good luck

[Bagger]

Originally Posted by blbrownssr

I have a question about the running tempature and Idle tempature. The car is 95 SSR automatic the elevation is over 6000 feet above sea level. I complained to Al Serria Chevrolet that during warm summer days (high 80's to low 90's) that during a stop light cycvle the tempature would reach 240 degrees. I also informed them that the fan was running very slow and quite. They checked the computer and found no record of it overheating (well duh), I didn't let that happen. I was also told the fan is a single speed fan. I have two other cars that have electric fan and they both sound like a jet engine when they run but not the SSR. During normal driving the tempature stays a little below 210 degrees and that's with the air on.

Any feedback would greatly appricated.

I haven't post a picture of the SSR yet but it will happen.

There's quite a bit of info on this issue in the tech forum of this site. Use the search function. But in a nutshell it is a two speed fan and it sounds like yours is not going on the high speed. Turn your AC on and inside fan speed to max (at least above 3) and see if the fan comes on the higher speed. If not, that's your problem.

[Mike in AZ]

With Air Conditioning OFF......
You are only on the temperature driven logic for the main fan.....
1) Fan goes from off to low speed at 226F (rising) and shuts back off at 219 (falling).
2) Fan goes from low speed to high speed at 235 (rising) and back to low at 226 (falling).

With Air Conditioning ON.......
All temperature logic (above) applies, PLUS.....
You are also operating on the A/C system pressure logic.
1) When system pressures in the A/C require airflow across the condenser, the fan will go to low speed. When system pressures rise to a higher level, the fan will go onto high speed.
2) Not all SSRs act the same. There may seem to be some variability in the pressure switch points, but it is really just the freon charge in the system, cabin blower speed, outside air temp, inside air temp and vehicle speed.
3) At speeds above 35 mph, the A/C system pressure logic is disabled and you are back onto the temperature logic only.

Hope this helps your understanding....


Mike

[Rube]

Originally Posted by Mike in AZ

With Air Conditioning OFF......
You are only on the temperature driven logic for the main fan.....
1) Fan goes from off to low speed at 226F (rising) and shuts back off at 219 (falling).
2) Fan goes from low speed to high speed at 235 (rising) and back to low at 226 (falling).

With Air Conditioning ON.......
All temperature logic (above) applies, PLUS.....
You are also operating on the A/C system pressure logic.
1) When system pressures in the A/C require airflow across the condenser, the fan will go to low speed. When system pressures rise to a higher level, the fan will go onto high speed.
2) Not all SSRs act the same. There may seem to be some variability in the pressure switch points, but it is really just the freon charge in the system, cabin blower speed, outside air temp, inside air temp and vehicle speed.
3) At speeds above 35 mph, the A/C system pressure logic is disabled and you are back onto the temperature logic only.

Hope this helps your understanding....


Mike

I know there is enough thread on this fan issue for Mike in AZ to weave a Navajo rug, but here goes: Yesterday I picked up my 05 auto from the local tranny shop following an install of Greg Ducato's convertor and Servo. They had the battery disconnected a couple hours during the install and had it out for a test drive already. The fan was operating perfectly before, but now has no high speed. When I punch the AC button, it goes from slow to off. There must be a fuse or relay for me to check first. Where is it?

[Mike in AZ]

Originally Posted by Rube

I know there is enough thread on this fan issue for Mike in AZ to weave a Navajo rug, but here goes: Yesterday I picked up my 05 auto from the local tranny shop following an install of Greg Ducato's convertor and Servo. They had the battery disconnected a couple hours during the install and had it out for a test drive already. The fan was operating perfectly before, but now has no high speed. When I punch the AC button, it goes from slow to off. There must be a fuse or relay for me to check first. Where is it?

You have two relays in the fan circuitry. Both of them are on the driver's inner fender panel, forward of the windshield washer fluid bottle. The black one is low speed (has the blue 12 ga. wire coming out of it) and the grey one is high speed (has the grey 10 ga. wire coming out of it).

The fan itself does not have two separate circuits internally. High speed input goes directly to the motor and low speed input goes through an internal 1 ohm resistor to the same point inside the motor. The 1 ohm resistor limits the current through the motor and drops about 6 vdc in the process. Giving you about 6 volts to the motor on "low speed".

If you have the A/C on and the "recirculate" button pushed, you will drive the fan to high speed most of the time. Remember that the system pressures are the controlling factor here.

If you need any more troubleshooting help, send me a PM with your phone number and we can talk through it.

Regards,

Mike

[Rube]

Thanks Mike, I found the relays and tried the AC w/ recirc and get what I think is only slow fan that doesn't stay on constantly. I recall the high speed to have been noticably audible. W/O AC, brought it up to temp and beyond and slow fan engages so coolant signal works. I'll have a dealer check the relay next week. I ordered your air dam a couple days ago. I think I'll probably need a few other simple engineering items too if it turns out the fan is operating properly.

[blbrownssr]

I did all the test and everything seem to check out, and the fan is operating properly but it is not doing it's job. I think a replacement system is in order. Thanks for the help to all.
See ya in Estes Park...

[abadssr]

if the eplacement one is in order for yours get the dealer to put on a new one then go home and order the set up for repladcement fan on the ls2 engine ssr's from mike in az take off the dealer fan and put mikes on problem solved and you still have new factory fan (you could maybe sell it) buy mikes the guy knows what he' doing

[artsmart]

Originally Posted by abadssr

if the eplacement one is in order for yours get the dealer to put on a new one then go home and order the set up for repladcement fan on the ls2 engine ssr's from mike in az take off the dealer fan and put mikes on problem solved and you still have new factory fan (you could maybe sell it) buy mikes the guy knows what he' doing

did that...new fan didn't do the job, put in Mike's aftermarket (also aux fan), had Joe reset turn on temps and it is working great...have OEM sitting in the attic in case I ever need it If this summer's temps are too much for the new fan we will be looking at Mike's radiator as well

[mikepowell]

literally

I'm getting the full simple engineering compliment as soon as he catches up

[blbrownssr]

Originally Posted by artsmart

did that...new fan didn't do the job, put in Mike's aftermarket (also aux fan), had Joe reset turn on temps and it is working great...have OEM sitting in the attic in case I ever need it If this summer's temps are too much for the new fan we will be looking at Mike's radiator as well

Is it necessary to reset the turn on settings or just advisable? The reason I ask is that I don't know of a reliable shop in my area except the Corvette Center between Pueblo and Colorado Springs and they are booked.

[Mike in AZ]

Originally Posted by blbrownssr

Is it necessary to reset the turn on settings or just advisable? The reason I ask is that I don't know of a reliable shop in my area except the Corvette Center between Pueblo and Colorado Springs and they are booked.

You have lots of options here.......

With only a main fan, I'd recommend reprogramming the temps to 210 (low speed) and 220 (high speed). This will still keep the "two speed" function and allow your truck some room between the thermostat opening point (195) and the fan turn on. This will mean that you have to get someone to make the adjustment for you.

If you choose to do the Aux Fan and also reset your temps, I'd recommend setting the Aux fan for 205, the low speed at 215 and high speed at 225. This allows a little room for each one to try to regulate the temp. This configuration is the most desireable, as it has a stair step (3 steps) effect of fans for cooling the system....

You can also choose to install only the Auxiliary Fan kit. This will do for 95% of the SSRs that want a little more cooling and avoid messing with your fan set points. If you set the Aux Fan to come on at 210, it will stop almost all of the temperature swings.

The Aux Fan was designed to fill most of the operational voids that GM left in the cooling system without impacting anything else or reprogramming any software. It is a pretty simple little unit that does a remarkable job.

Randi's (Artsmart) truck was an exceptionally challenging one, since it seems to have a propensity for running hotter than the rest. Don't ask why....... we still have not really figured it out....... But we have that one tamed, now.

Drop me a PM if i can help.....

Regards,

Mike

[RUN ROD RUN]

Randi's (Artsmart) truck was an exceptionally challenging one, since it seems to have a propensity for running hotter than the rest. Don't ask why....... we still have not really figured it out....... But we have that one tamed, now.

Artsmart even got her foot doctor involved in this too... and the diagnose is looking good for a comfortable running temperature this summer.