Help with overheating issue

[mpete1]

New member here, but long time LS owner. My wife's 02' LS has 200K on it and we have been having some overheating issues of late. I have looked through some of the threads relating to this, and I believe I have a few ideas as to what the problem(s) may be but would like some of your input.

The overheating has all begun since the weather has started to turn warm. Last night on the way home from work she turned on the A/C and the car immediately started to overheat, about 3/4's of the way on the temp gage. She proceeded to roll the windows down and drive home with the heat on, which I heard about in no kind fashion. Now after doing some looking around I believe I may have a multitude of issues. I have replaced the DCCV valve, but that has been 3-4 yrs ago, I can't remember the exact symptoms for changing back then, but I believe they were similar,and it was winter time. I checked the hydraulic fan reservoir and the fluid is milky pink, which now tells me there is H2O in the reservoir, and more than likely at a minimum the solenoid needs replaced. These are the two things I should start looking at first.

Does anyone have any other things I may check to try and narrow the problem down even further?

If I replace the DCCV valve again, should I replace the thremostat, it was replaced about 6 yrs ago.

I will also burp the coolant system at the degas bottle when she gets home tonight, while the care is still hot..that's always fun.

Thanks,

 

[hite337]

First off you bleed the system at the bleeder screw next to the degas bottle, I have never heard of burping at the degas bottle.

Next, the dccv controls the temp on each side of the interior. It can cause overheating but ots more than likely one of the plastic cooling system parts or your hydraulic cooling fan.

If you are planning on keeping the LS for awhile the replace the degas bottle, thermostat, thermostat housing, and coolant fill tower.

If your cooling fan has 'strawberry ' milk in it, convert the fan to electric rather than replace parts on it because they aren't cheap. Remove the fan amd pump, get a shorter serpentine belt and install an electric cooling fan such as the Flex-A-Lite 183. You can do this for about $320 if you do it yourself. I did a write up about this procedure but I'm on my phone right now so i cant get you the link yet. I will post it later of you want

 

[mpete1]

Thanks for the response, sorry about my terminology, I will bleed the system from here on out.

I finally had a chance to drive the car this weekend. Here is what is happening. From a cold start and turning the AC on 60 , blowing warm to hot air out of the vents. Drove 15 minutes, and stopped at the store, started again...same thing warm/hot air blowing from vents, a few minutes into the drive a high pitch sound heard from the inside of the car and cool air comes on, no overheating this time? Pulled into the garage and opened the hood fan is blowing, really hot air off the radiator, but I am not sure whether it is on high speed. Let is sit for a few minutes and it maintained temperature.

Now I am a little more confused on what to replace?

I will look for the electric fan replacement write-up.