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over heatin on a99 deville


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check your water pump belt. It is towards the front of the engine on the drivers side. It is driven by a cam shaft on yhe front head. This belt often goes neglected, because it isn't obvious with the belt gaurd.

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check your water pump belt. It is towards the front of the engine on the drivers side. It is driven by a cam shaft on yhe front head. This belt often goes neglected, because it isn't obvious with the belt gaurd.

i pulled the cover and looked at the belt but the belt had no damage any other ideas

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Welcome aboard

Do a search, overheating, we have a TON of info.. There is a saying, God helps those who help themselves.. The search function can turn up a lot here...ESPECIALLY on this subject.

check:

purge line

cap

water pump belt and tensioner

cooling fans

pressure test the system

then have the coolant checked for combustion by-products to see if you have a bad head gasket

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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Welcome aboard

Do a search, overheating, we have a TON of info.. There is a saying, God helps those who help themselves.. The search function can turn up a lot here...ESPECIALLY on this subject.

check:

purge line

cap

water pump belt and tensioner

cooling fans

pressure test the system

then have the coolant checked for combustion by-products to see if you have a bad head gasket

Thank u i really appreciate the info

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One more thing, explain what you mean by overheating, is it boiling over or is it a temp thing?

Add to the list above:

Make sure that the coolant has at least a 50/50 concentration

Made sure you use the GM cooling supplement tablets

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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check your water pump belt. It is towards the front of the engine on the drivers side. It is driven by a cam shaft on yhe front head. This belt often goes neglected, because it isn't obvious with the belt gaurd.

i pulled the cover and looked at the belt but the belt had no damage any other ideas

The belt can stretch with age, and the tensioner might not be providing proper tension. I'm going to be looking at this on my car here soon, too. My belt has some play in it.

WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn.

Cheers!

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One more thing, explain what you mean by overheating, is it boiling over or is it a temp thing?

Add to the list above:

Make sure that the coolant has at least a 50/50 concentration

Made sure you use the GM cooling supplement tablets

its both it gets up to 242 degrees ill shut it down boil out thru tha over flow thats with the right of amont of water an fluid

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check your water pump belt. It is towards the front of the engine on the drivers side. It is driven by a cam shaft on yhe front head. This belt often goes neglected, because it isn't obvious with the belt gaurd.

i pulled the cover and looked at the belt but the belt had no damage any other ideas

The belt can stretch with age, and the tensioner might not be providing proper tension. I'm going to be looking at this on my car here soon, too. My belt has some play in it.

how do u tell if the belts streched

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Look for cracks, polished sections that look smooth from slipping, missing sections. Check the tensioner to see if it is binding at all.

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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i have a 99 cadilac deville 32v northstar thats over heatin, i change tha radiato , the hoses,thermostat. theres no leaks b :mellow: ut still over heats . eletric fans kick on please write me if u have any ideas
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i have a 99 cadilac deville 32v northstar thats over heatin, i change tha radiato , the hoses,thermostat. theres no leaks b :mellow: ut still over heats . eletric fans kick on please write me if u have any ideas

Check for a clogged purge line/ bypass hose. My 98 Deville had that after they changed the radiator. Are you watching the temp displayed on your information system? Mine went up to over 240 F. From memory the fan kicks on about 220. According to the dealor, the auto shut down sensor is on the other side of where the bypass gets clogged. You might get a clogged bypass if someone ever puts in the wrong type of anti freeze

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i have a 99 cadilac deville 32v northstar thats over heatin, i change tha radiato , the hoses,thermostat. theres no leaks b :mellow: ut still over heats . eletric fans kick on please write me if u have any ideas

Check for a clogged purge line/ bypass hose. My 98 Deville had that after they changed the radiator. Are you watching the temp displayed on your information system? Mine went up to over 240 F. From memory the fan kicks on about 220. According to the dealor, the auto shut down sensor is on the other side of where the bypass gets clogged. You might get a clogged bypass if someone ever puts in the wrong type of anti freeze

would u know were the purge line or bypnoideaass is located i have

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i have a 99 cadilac deville 32v northstar thats over heatin, i change tha radiato , the hoses,thermostat. theres no leaks b :mellow: ut still over heats . eletric fans kick on please write me if u have any ideas

Check for a clogged purge line/ bypass hose. My 98 Deville had that after they changed the radiator. Are you watching the temp displayed on your information system? Mine went up to over 240 F. From memory the fan kicks on about 220. According to the dealor, the auto shut down sensor is on the other side of where the bypass gets clogged. You might get a clogged bypass if someone ever puts in the wrong type of anti freeze

would u know were the purge line or bypnoideaass is located i have

I posted to check the purge line on my first post to you, you didn't check it yet?

I just did a search and came up with this. See post #15 in the following thread

http://caddyinfo.ipbhost.com/index.php?sho...65&hl=purge

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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i have a 99 cadilac deville 32v northstar thats over heatin, i change tha radiato , the hoses,thermostat. theres no leaks b :mellow: ut still over heats . eletric fans kick on please write me if u have any ideas

Check for a clogged purge line/ bypass hose. My 98 Deville had that after they changed the radiator. Are you watching the temp displayed on your information system? Mine went up to over 240 F. From memory the fan kicks on about 220. According to the dealor, the auto shut down sensor is on the other side of where the bypass gets clogged. You might get a clogged bypass if someone ever puts in the wrong type of anti freeze

would u know were the purge line or bypnoideaass is located i have

I posted to check the purge line on my first post to you, you didn't check it yet?

I just did a search and came up with this. See post #15 in the following thread

http://caddyinfo.ipbhost.com/index.php?sho...65&hl=purge

thank u most helpful just check purge line ...cloged i was lookin for which line was cloged for ever but could figure it out i appreciate it

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i have a 99 cadilac deville 32v northstar thats over heatin, i change tha radiato , the hoses,thermostat. theres no leaks b :mellow: ut still over heats . eletric fans kick on please write me if u have any ideas

Check for a clogged purge line/ bypass hose. My 98 Deville had that after they changed the radiator. Are you watching the temp displayed on your information system? Mine went up to over 240 F. From memory the fan kicks on about 220. According to the dealor, the auto shut down sensor is on the other side of where the bypass gets clogged. You might get a clogged bypass if someone ever puts in the wrong type of anti freeze

would u know were the purge line or bypnoideaass is located i have

I posted to check the purge line on my first post to you, you didn't check it yet?

I just did a search and came up with this. See post #15 in the following thread

http://caddyinfo.ipbhost.com/index.php?sho...65&hl=purge

thank u, most helpful i checked the pure line...cloged i knew there was a clog n the system some where i just counldnt figure it out i really appreciate it

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DEFINATELY let us know how this turns out....

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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DEFINATELY let us know how this turns out....

whats the highest temp it should reach be 4 it goes back down the purge line was cloged an makin it skyrocket but its fixed now i was just wondering the temp it stays at or it fluxuates

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It really depends on the outside temps in your area. Keep in mind that with the AC on it makes a difference. If I recall your AC is not functioning is that correct? In that case, you probably will hit 226-228 before it starts to drop

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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It really depends on the outside temps in your area. Keep in mind that with the AC on it makes a difference. If I recall your AC is not functioning is that correct? In that case, you probably will hit 226-228 before it starts to drop

is that nornal or should work on the AC to get the car runnin coller?i drove it yesterday at 95 F outside n stop n go traffic it got to 206, then i drove it again at night at 85 F it got to 203 an started droping back 190s dose that seem nornal to u?

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Sounds GREAT.... With the AC on, the FANS run 100% of the time CONSTANTLY...because the fans run all the time you won't see wide ranging temps. With the AC off, the FANS don't turn on till 226 to 228 and you will see wider ranges of temps.

Your temps sound good

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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Sounds GREAT.... With the AC on, the FANS run 100% of the time CONSTANTLY...because the fans run all the time you won't see wide ranging temps. With the AC off, the FANS don't turn on till 226 to 228 and you will see wider ranges of temps.

Your temps sound good

thank u i would of never figured it without ur help.

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No problem, keep an eye on it. Glad we could help

(LOOK AT HOW MUCH YOU LEARNED!!)

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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