HELP Cooling system
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2004-2007 Cadillac CTS-V General Discussion Discussion, HELP Cooling system in Cadillac CTS-V Series Forum - 2004 - 2007; Please help my 2004 ctsv is pissing me off. basically stock engine aftermarket exhaust and CAI. If I'm in traffic ...
  1. #1
    stever06 is offline Cadillac Owners Member
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    HELP Cooling system

    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.

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    HAMSTAR is offline Cadillac Owners Enthusiast
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    Re: HELP Cooling system

    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.

  4. #3
    stever06 is offline Cadillac Owners Member
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    Re: HELP Cooling system

    Thanks for the info can I reprogram the fans with a controller or do I need a shop to do that.

  5. #4
    Andringa is offline Cadillac Owners Enthusiast
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    Re: HELP Cooling system

    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?

  6. #5
    stever06 is offline Cadillac Owners Member
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    Re: HELP Cooling system

    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.

  7. #6
    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    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.

  8. #7
    stever06 is offline Cadillac Owners Member
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    Re: HELP Cooling system

    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.

  9. #8
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    Skidmarcx is offline Cadillac Owners Fanatic
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    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

  10. #9
    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by Skidmarcx View Post
    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

  11. #10
    stever06 is offline Cadillac Owners Member
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    Re: HELP Cooling system

    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.

  12. #11
    HAMSTAR is offline Cadillac Owners Enthusiast
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    Re: HELP Cooling system

    210 is normal operating temp for a stock engine, IIRC. Maybe you need your AC recharged?

  13. #12
    stever06 is offline Cadillac Owners Member
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    Re: HELP Cooling system

    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.

  14. #13
    Andringa is offline Cadillac Owners Enthusiast
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    Re: HELP Cooling system

    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.

  15. #14
    stever06 is offline Cadillac Owners Member
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    Re: HELP Cooling system

    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.

  16. #15
    JFensty's Avatar
    JFensty is offline Cadillac Owners Enthusiast
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    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.

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