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2000 DTS heating prob. HELP me please


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Hi there

I have a 2000 DTS Caddy, today I faced the biggest problem in this lovely car, after I drove the car for almost 200 KM then it start to heat I turned off the engine for almost 15 min. then I start the engine and refill the coolant tank just a bit may be half letter then it start to drink it. So, I continue driving the car for almost 200 km again then it starts to heat again till it reach the last quarter before the red zone. I pulled the car for 5 min. then I opened the coolant tank a half till the steam goes a way for almost 7 min. I opend the cover of the tank and it looks full so I start the engine to let the radiator to drink the water to cool down the heat but unfortunately the never drinks any water it just push out more water and steam!!!!

So, I waited 2 hours and then try to start the engine and the same heat come again and the car did not drink any coolant the tank the same.

What should I do to fix it???

My brother told me to wait till the car cool down for almost 5 hours then I should start the engine and open the coolant cover and refill while the car heated up gradually and drink the coolant gradually!!!

But one of my friend told me this kind of cars have one way out for the coolant system which is the coolant cover. So the coolant pipes and radiator has been filled with air & steam and I should to open lower scrw under the radiator to let all the air goes up and the radiator filled with water !!!!! is this true????

How about the water pump, how can I know if it’s working or not?????

Can you please advise me by the solution?? Cause both radiator fans work and there is no leak but the weather was too hot almost 48 c and as I think it let all the coolant run out!!!!

Please please please help me to find the solution.

Many regards

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First, where do you live?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok

You have mentioned that you put WATER in a few times, do not use water as coolant, especially in temps like you get in your part of the world

Check these things

1) check the coolant to water concentration it should be at least 50%

2) check to make sure the cooling system holds pressure and that there are no leaks

3) check that the cap holds pressure

4) check the water pump belt and tensioner

5) The cooling system lets AIR out of the system at the high point in the system, you must make sure that the purge line is clear, when the engine is cool and full of coolant, start the engine, and pull the 3/'8" hose off the top of the black coolant tank, and coolant should flow, be sure its the hose that goes to the engine and its not the overflow hose.

6) Check the thermostat, change if it has not been changed recently

7) Check the cooling fan operation

Never put cold or cool coolant into a HOT engine, it will spontaineously boil and you risk cracking the block. You should stop the engine if you get temps over 245

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok

You have mentioned that you put WATER in a few times, do not use water as coolant, especially in temps like you get in your part of the world

Check these things

1) check the coolant to water concentration it should be at least 50%

2) check to make sure the cooling system holds pressure and that there are no leaks

3) check that the cap holds pressure

4) check the water pump belt and tensioner

5) The cooling system lets AIR out of the system at the high point in the system, you must make sure that the purge line is clear, when the engine is cool and full of coolant, start the engine, and pull the 3/'8" hose off the top of the black coolant tank, and coolant should flow, be sure its the hose that goes to the engine and its not the overflow hose.

6) Check the thermostat, change if it has not been changed recently

7) Check the cooling fan operation

Never put cold or cool coolant into a HOT engine, it will spontaineously boil and you risk cracking the block. You should stop the engine if you get temps over 245

Many thanks for your advice, I finally found the problem today I remember I went to a mechanic to cancel the heater tank so what he does is to cut the heater pipe and blocked with a spark plug!!!!!!

As a result, the pipe he blocked is the same one from the coolant tank so the engine runs on circulation without the coolant tank unfortunately.

I know it is an easy way to fix but I don’t have time so I parked the car to one good mechanic to fix it by 30 $ and he will cancel the heater as well cause he just has to connect the 2 pipe line from and in the heater in the connector which come from the coolant tank and connect it to the engine and it will do a full circulation as I hope. It was a nightmare to me to see my caddy suffering and I hope nothing goes wrong.

By the way, those cars as I seen in this scenario runs in hard conditions cause in my caddy it’s circulate the coolant for almost 3 weeks without the coolant tank.

Best regards to all assistance you provide to me.

I hope to fix the other issue with A/C vents cause till now it blow normal (it was hot air till I blocked the heater) air every 4 min. after I drove the car above 100 or I increase the speed paddle vastly.

I don’t trust those electricians cause they just want money with no benefit.

Regards

Wajeh

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If you need to block the heater pipe to get cool air you are having problem with a temperature actuator

Do you know if this is an EXPORT model of the cadillac or is it a US Domestic Cadillac?

If it is an export the DTC codes you extract will be different. But, you need to extract codes.

Go to the top of this page, go to caddyinfo.com, go to HOW TO, go to DTC CODES and follow the directions for your year and model Cadillac.

Extract the codes that come up on your DIC (dash) and post them here, we should be able to help you with your problems

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Many thanks for your advice, I finally found the problem today I remember I went to a mechanic to cancel the heater tank so what he does is to cut the heater pipe and blocked with a spark plug!!!!!!

That is no mechanic.

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