When you step on gas temp goes down to nom and you have heat no anti freeze leaks
IF you have a viscous fan hub the overheat at idle problem will be there. Replace it with a brand new one. If you have electric fans check heat sensors and circuits, Check for fault codes
Maybe the water pump has been eaten away
The GM Dexcool hasn't worked out well for the last
years or so
May have to do the water pump & go to a universal
coolant
If your saying it is only a cabin heat issue then your going
to have to understand the system & diagnose that part
SOURCE: 2000 Cadillac Deville DTS is in anti- theft mode
you can reset the system by turning key to on position for 5-10 mins and then try starting it but its probably a short or grounding prob try the engine to chassis ground
SOURCE: 1998 cadillac catera anti-freeze leak
First things first don't use Dexcool.
It would happen only once in a while likely because the overflow bottle doesn't always fill to the point of where the leak is located. It would be very easy to unbolt the bottle and fill it with water to find the leak and patch it up.
SOURCE: it idles pretty bad when car is in a complete
check the hose coming from the air intake manifold going to the throttle body its called a plenum hose it may have a leak
SOURCE: 1998 cadillac deville fans not coming on starts
If your fans are not coming on then your engine is not receiving the signal that it is overheating. This can be caused by bad fans (unlikely they are both out) a bad relay, or coolant temperature sensor. I would start by checking or replacing the temperature sensor as it can become corroded which is what the PCM uses to turn the fans on. Many vehicles use two sensors, one for the gauge and the other for the ECU, make sure you check/replace the right one. It should be a cheaper part and if you are unsure then match the new one with its location; it should be on the intake manifold or near it, generally with one or two wires. I think you will find your problem as they are common failed parts.
Good luck!
For car running hot and overheating issues, I suggest to you go
through this help links. Click this link below and go through the
troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and
troubleshooting?
http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.
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