Hi I have a 1996 Cadillac Sedan Deville that has been overheating only when idling or going slow.
The temp goes to about 223 and shuts the motor off. When going down the road it is fine, I am assuming this is from the wind keeping it cool enough. Have had the coils and ignition module checked and they are ok but it (the module) do not get as hot on the machine as it does on the car. Just had the radiator flushed also. What could the problem be? It shuts down every time around that temperature.
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Need to check the impella on the back of the water pump for corosion. may have loss a couple of fins. need to check for unrestricted water/coolant flow or lack there of. bleed all air out of cooling system use a funnel or something to get the water your putting in above the highest point of the engine and bleed the air out (temp sensors dont like steam readings)
I have a 96 cadillac sedan deville now first what happen it wouldnt drive over 40 so i checked the transmission fluid and it needed it so it was good till i took it to work i went to pass a car and my ac stop blowing cold so i brought it down to 65 then my ac started blowing cold again but my transmission hot light came on what should i do or what might be the problem
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