02 DTS overheating
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 02 DTS overheating in Past Cadillac Vehicle Discussion; Hi. New to Cadillacs and I have an 02 Deville that is overheating. I put a new water pump and ...
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    02-Deville is offline Cadillac Owners Member
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    02 DTS overheating

    Hi. New to Cadillacs and I have an 02 Deville that is overheating. I put a new water pump and a new thermostat in it today. There is no flow through the top radiator hose. Not sure what to do now.

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    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: 02 Deville dts overheating

    Quote Originally Posted by 02-Deville View Post
    Hi. New to Cadillacs and I have an 02 Deville that is overheating. I put a new water pump and a new thermostat in it today. There is no flow through the top radiator hose. Not sure what to do now.
    --------------------------
    check the PURGE LINE -

    the PURGE LINE is the only way of expelling air from the Northstar cooling system -

    it is a 3/8 diameter hose that goes from a hollow bolt in the thermostat/waterpump housing area of the engine - and plugs onto a nipple on the side of the SERGE TANK -

    with the engine running - there should be a gentle - constant flow of coolant - from the engine - to the serge tank -

    if there is no flow - the most likely cause is a blockage in the hollow bolt -

    follow the hose towards the engine - with the engine OFF - remove the hose - use a straightened metal coat hanger - or something similar - and poke it into the hollow bolt -

    the coat hanger should go in about 2 1/2 inches -

    once the hollow bolt is cleared - you can briefly start the engine to verify coolant flow - be sure to use some sort of container to catch the coolant so you don't make a mess -

    check the hose and serge tank for blockage -

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    02-Deville is offline Cadillac Owners Member
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    Re: 02 Deville dts overheating

    Ok. Thanks I thought I checked it already but it must not have been the right thing. I'll try find that tomorrow.

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    Ranger's Avatar
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    Re: 02 Deville dts overheating

    Why did you change the WP? Was it leaking?
    Did you use the correct thermostat?
    Did you run the engine at about 3K to purge the air from the system and top off as needed?
    What's your coolant level now?

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    02-Deville is offline Cadillac Owners Member
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    Re: 02 Deville dts overheating

    I changed it cuz there was no flow. And yes I used the right thermostat. Its a 180 degrees. And I let the car idle for 10 minutes then drove it around the block. Then I checked it. The overflow tank was full. I looked at it this morning and there is no fluid in the tank and the purge line and bolt is clear.

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    MoistCabbage's Avatar
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    If a water pump is turning quietly, and not leaking, it's fine.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 02 DTS overheating

    Read the cooling system operation article up ^^^ in the Cadillac Technical Archive - in the top- black bar.

    Read the sticky posts on cooling system operation and temp gauge operation in the stickys in Northstar Performance.

    Check coolant level cold only, and maintain the surge tank at the FULL COLD mark noted on the tank top and side.

    When you changed the water pump, did you check the belt tensioner pulley for smooth, quiet, viscous operation?

    Your thermostat is supposed to begin opening at 188 and be fully open at 206. With no A/C function set, fans go to SLOW at 224 and FAST at 236. With any HVAC function set that calls for A/C compressor operation, fans run in SLOW all the time.

    Annotated temperature gauge in my albums.

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    Re: 02 Deville dts overheating

    Quote Originally Posted by 02-Deville View Post
    I looked at it this morning and there is no fluid in the tank and the purge line and bolt is clear.
    Obviously there was air in the system. Top it off to the correct level (1/2 full) and take it for another ride. Then check it again after it cools. Top off again if necessary and repeat until it stabilizes. Might take 2 or 3 times.

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    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok so I've tryed everything on this car. Not sure what else I should look at.

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    MoistCabbage's Avatar
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    Have you filled the system?

    If so, did you check the purge line before or after?

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    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Yes. I've checked it after every worm up and cool down and added coolant. But there is still no flow through the radiator

  13. #12
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: 02 DTS overheating

    Quote Originally Posted by 02-Deville View Post
    Yes. I've checked it after every worm up and cool down and added coolant. But there is still no flow through the radiator
    -----------------------------
    how have you determined there is no flow through the radiator?

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    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    When the car is running and worm I grabbed the hoses and there was no fluid flowing through them. They were squishy when they should be hard

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    Re: 02 DTS overheating

    I think you are headed down the wrong path and may have even changed the WP for nothing (you wouldn't be the first). If the belt is attached, the tensioner is not frozen and the pump pulley is turning, you have coolant flow.

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    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok well. What should I be looking for. I've never worked on Cadillacs before. Mainly trucks and imports. So im not sure what to look for and what to try with this one. I'm just trying the stuff that I'm used to seeing going out.

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