: HELP Cooling system



stever06
07-19-13, 09:17 AM
Please help my 2004 ctsv is pissing me off. basically stock engine aftermarket exhaust and CAI. If I'm in traffic or sitting still with the a/c off my car is running 208 to 213 if the a/c is on im at 230 and climbing in the 95 degree temps lately the car overheats I hit 250 with the a/c on it did the same thing with the stock leaking radiator. I installed an ALRADCO to help cooling and get rid of my leaking but now the airflow is worse because these fans suck and the rad is thicker. They only way im at 195 and the a/c works is on the highway. In traffic I have to turn off the a/c or im screwed this doesn't work to good when your in a tie seeing clients. Yes the fans are running full speed. Someone please help.

HAMSTAR
07-19-13, 09:32 AM
The easiest thing you can do is to increase the ratio of water:coolant. More water will help you cool better, though too much water will risk freezing in the wintertime. Sounds like you should probably run 4:1 water:coolant as an emergency measure. Next, you could replace your tstat with a 160 degree stat. That will open up the water flow earlier and maybe help to head off some of the higher temps. Along with the low temp tstat, you should get your computer reprogrammed to turn on the fans earlier to make sure you don't go that high up in temps.

stever06
07-19-13, 09:42 AM
Thanks for the info can I reprogram the fans with a controller or do I need a shop to do that.

Andringa
07-19-13, 10:37 AM
Honestly it sounds like you have a problem. That isn't normal behavior. How many miles are on your car? What did the old coolant look like when you swapped radiators?

My bet is that you aren't moving enough water, or you have air in the system.
Are you positive that your thermostat is opening all the way?

stever06
07-19-13, 11:08 AM
The coolant looked good but when I changed the rad I put new 50/50 dex cool in. I am 90% sure the tstat is opening hose is hot all looks ok under the hood. I really think its all about the air flow with the fans the system ran the same with the old rad the only difference now is the a/c is a little worse because of the thicker rad again going back to the air flow.

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Sorry the car is a 2004 with 65000 miles and was maintained very well I have all the documentation. Thanks for the help.

RyRidesMotoX
07-19-13, 11:34 AM
I would change the Tstat. Its a pretty cheap part and it's not hard to change. I had a similar issue in my old S10.

stever06
07-19-13, 11:59 AM
I will try that thanks. I thought I read some where on the forum about one of the guys changing the fans to two 5 blade for better air flow wonder if that would help.

Skidmarcx
07-19-13, 12:01 PM
Sounds like the tstat is opening or else the car wouldn't cool at higher speeds... Have you improved your engine and chassis grounds? Perhaps there is a problem there? I agree on getting the fans reprogrammed to the lowest setting and perhaps even going with a 180 degree tstat

RyRidesMotoX
07-19-13, 12:04 PM
Sounds like the tstat is opening or else the car wouldn't cool at higher speeds... Have you improved your engine and chassis grounds? Perhaps there is a problem there? I agree on getting the fans reprogrammed to the lowest setting and perhaps even going with a 180 degree tstat

I think he means 160… but yea the tstat could be sticking shut and not opening til it gets really hot. I dunno its just cheap insurance. He dropped the coin on an alradco I figure a $13.49 part isn't a huge deal

Napa pn: 506186
Product Line: NAPA Thermostats
IMPORTANT INFO: 186 Degrees;Seal Included

stever06
07-19-13, 12:32 PM
I did go through the grounds which made my oil temp reading a little better. I will install a 180 I live in Chicago and will have to drive the car in the winter when its not snowing. It just gets so hot when not moving is why I think its the fans not moving enough air.

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Also this morning driving in to work it was about 83 and humid the car was running 192 on highway and 208 in traffic the a/c was doing ok but once the temp hits about 210 the a/c is done unless I can get the car moving and get some air through the condenser.

HAMSTAR
07-19-13, 12:37 PM
210 is normal operating temp for a stock engine, IIRC. Maybe you need your AC recharged?

stever06
07-19-13, 12:52 PM
Nope a/c is great Im an HVAC service tech for 15 years checked a/c charge looks good if air is moving through the condenser like on the highway the a/c is ice cold have to turn the a/c fan down.

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I agree with reprogramming the fans to come on sooner (lower temp) but when the a/c is on the fans are running on high all of the time correct.

Andringa
07-19-13, 05:30 PM
Does the car actually complain when coolant temps hit 250F? I know that the Oil temp alarm goes off at 300F.

Like HAMSTAR said 210 is a perfectly fine running temp. I honestly do not know what temp you should start to be concerned at while stationary.

stever06
07-19-13, 05:49 PM
oh ya past 250 starts binging and dinging the other day I had both the water and oil binging and ding had to turn off a/c and open windows and then the temp dropped a little.

JFensty
07-19-13, 06:35 PM
My guess is that the fans aren't working correctly. With a/c on, both fans should be on. With a/c off, fans are temp specific. IIRC, one fan turns on at 208 or something ridiculous and the secondary comes on at 215. I would stay with the 195 tstat and change the fan temps.

Make sure they both fans are on with the a/c on. Airflow shouldn't be an issue. Heat index here is 114 and I am 198-205 with a/c on stock radiator, and stock temp tstat. I had my tuner change my fan temp settings.

Before changing my fan temp settings, the temp would go down if I turned the a/c on.

stever06
07-24-13, 12:11 PM
Does anyone think the lower splash guard has anything to do with the cooling mine is not there it was missing when I bought the car.
Those temps JFensty posted are great. I can see both fans running while a/c is on but my temps sure don't go down with the a/c on.

HAMSTAR
07-24-13, 12:19 PM
Well, you need a lower splash guard because it helps guide the airflow under the car. Without it, people have reported their hood jumping up and down at high speeds.

However, your problem doesn't seem to be related. Have you replaced your thermostat yet? Stat needs to be replaced with stock (at the minimum) because the stock one could be sticking shut and not flowing enough coolant or replaced with 160 stat (optimally).

stever06
07-24-13, 12:25 PM
Thanks for the info I ordered a 180 should be here Friday going to replace it this weekend. wanted to stick with 180 because of cold temps here in Illinois.

HAMSTAR
07-24-13, 12:52 PM
Thanks for the info I ordered a 180 should be here Friday going to replace it this weekend. wanted to stick with 180 because of cold temps here in Illinois.

Great. Hope you enjoy the ritual quarterly coolant draining session.

carlson_mn
07-24-13, 01:23 PM
Quarterly coolant draining? Why would you do that? Maybe I missed something. Just changed mine out at 100k miles looked great car runs cool.

HAMSTAR
07-24-13, 01:32 PM
Quarterly coolant draining? Why would you do that? Maybe I missed something. Just changed mine out at 100k miles looked great car runs cool.

That was a bad joke about how often I have to have the rad out for various reasons.

JFensty
07-24-13, 09:36 PM
Running a lower temp tstat is pointless unless you lower the temp at which the fans turn on. Otherwise you may actually increase your temps due to the tstat being wide open and flowing the coolant too fast through the radiator not giving sufficient time to dissipate the heat.
I would say yes you need the lower splash guard. When driving it will help pull more air through the radiator.

AAIIIC
07-25-13, 12:14 AM
I will try that thanks. I thought I read some where on the forum about one of the guys changing the fans to two 5 blade for better air flow wonder if that would help.
Search for posts in the last month or two by Naf, he was the one that was talking about doing that.


I did go through the grounds which made my oil temp reading a little better. I will install a 180 I live in Chicago and will have to drive the car in the winter when its not snowing. It just gets so hot when not moving is why I think its the fans not moving enough air.

Also this morning driving in to work it was about 83 and humid the car was running 192 on highway and 208 in traffic the a/c was doing ok but once the temp hits about 210 the a/c is done unless I can get the car moving and get some air through the condenser.
Mine is behaving much the same way. When I'm stopped or going slow I'm apparently not getting enough air through the condenser and radiator. A/C stops blowing cold air and coolant temp starts to go up. Once I get rolling, A/C will start blowing cold air and coolant temp will eventually come back down. I had the A/C checked by the dealer a couple weeks back and they confirmed it's fully charged.

I do wonder if the Alradco radiator (I have one, too) isn't helping the low speed airflow, but with that said, there are other Alradco folks who don't seem to have problems. :confused:


210 is normal operating temp for a stock engine, IIRC.
Depends on when he's hitting that 210F. If it's stationary, that's not horrible. If it's at speed, that's definitely not normal.


My guess is that the fans aren't working correctly. With a/c on, both fans should be on. With a/c off, fans are temp specific. IIRC, one fan turns on at 208 or something ridiculous and the secondary comes on at 215. I would stay with the 195 tstat and change the fan temps.
The fans aren't always on if A/C is on - they're triggered by refrigerant pressure (~210# for low speed, ~265# for high speed - and no, I have no idea what those translate to as far as ambient temps or interior temps are concerned). And the low speed fans should come on at 202F, which doesn't strike me as ridiculous based on what the stock thermostat rating is. High speed fans come on at 220F.


Otherwise you may actually increase your temps due to the tstat being wide open and flowing the coolant too fast through the radiator not giving sufficient time to dissipate the heat.
That's an old wive's tale. Heat transfer in a heat exchanger is proportional to the mass flow rate of fluid.

stever06
07-26-13, 11:24 AM
My a/c was operating the same way with the stock rad. With the alradco its only slightly worse because the alradco is a little thicker again going back to the airflow with the fans while the car is not moving.

stever06
08-05-13, 02:33 PM
update installed the 180 tstat the temp is a little better but it looks like the pass side fan is not working properly so does anybody know if the fan assemblies on ebay are the same for the standard cts and the v. I do still believe the need to be reset with a tune to a lower temp.

stever06
08-20-13, 05:55 PM
Update #2 installed new fan on pass side, also installed 5 blade fan on pass in place of the 7 blade there is definitely more airflow temps today are near 90 while driving on the highway the temp is at 195 solid, the a/c is ice cold. on the local streets the temp rises to 210 to 220 if im siting still for a while it starts to creep up to 230 this is all with the a/c on if I don't get moving it starts to get to 244 the a/c is long gone by then. the heat soke with the a/c on is killing the temps. also installed the lower splash guard it helped a little with airflow. and yes the fans are running I have pulled over to check. pretty frustrating!!!! im sure a tune will help but again the fans should be running when the temps are that high and a/c is on.

HAMSTAR
08-21-13, 12:13 PM
I'm wondering if there's maybe something going on with your water pump. Have you called alradco for their advice?

Also, have you tried changing your coolant to water ratio from 1:1 to like 1:2 or 1:3?

stever06
08-21-13, 01:55 PM
Thanks for the reply Hamster I did add water the last few times I pulled the rad it prob at 1:2 now. Ill have to contact Alradco for some advice thanks for the good idea. Water pump issue, havnt really thought about the water pump being an issue all looks ok from the outside and the car is ok without the a/c running it seems to be a problem from the added heat soak of the a/c condenser with the a/c running.

odla
12-19-13, 12:12 AM
update on this? please.

atvguy585
12-23-13, 02:03 AM
Here is stock fan temps http://www.cadillacfaq.com/faq/answers/fantemps.html

stever06
12-27-13, 03:51 PM
Update, the cooler temps came and all is well obviously. Waiting for spring to have the fan temps changed to turn on at a lower temp. When I use the defrost if the car isnt moving the windows fog. I know the fans need to run sooner but Im pretty confident theres a problem with the a/c its really wierd. And dosnt make sense that the car has to be moving for the a/c or defrost to work.