Question about 1999 Cadillac DeVille

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Does a blown head gasket cause pressure build up in a surge tank

I have an overheating problem when driving at highway speeds (55mph+). I can let car idle for long periods of time and no problem, drive 40mph or less, no problem. I recently replaced a cracked radiator, put on new hoses, replaced thermostat and surge tank cap (16#). Upper radiator hose heats up fine, thermostat opens around 195', plenty of heat, no white smoke from exhaust, no visible leaks or puddles, purge line flows. I revved engine up to 2500 rpm for several minutes to warm engine up with temp set at max hot. Symptoms: I put a cup under surge tank overflow line and captured coolant escaping from NEW Surge tank cap. If system is building pressure when hot, blows out coolant through surge tank cap/overflow line, then overheats-probably from low coolant, is this an indication of a blockage, trapped air, a blown head gasket or something else?

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Could be a air pockets in the coolant system that have top bled out
it is a simple exercise to have a compression test done to check for head gasket or cracked head

Posted on Mar 14, 2017

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SOURCE: my 1999 cadillc deville delegance

IF COOLANT SYSTEM BEEN BLED AND PLENTY COOLANT IN COOLANT SYSTEM. THE IGNITION TIMING LATE OR VALVE TIMING LATE TIMING CHAIN WORN WITH A LOT OF SLACK JUMPED A TOOTH ON CRANKSHAFT GEAR TEETH OR ENGINE CYLINDER BLOCK WATER JACKETS CLOGGED ENGINE BLOCK NEED FLUSHING. IF ENGINE OVERHEAT WHILE SITTING IDLING LONG TRAFFIC LINE COOLANT FANS NOT TURNING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FANS RELAYS OR BLOWN FUSE.PCM FAULT.CHECK ENGINE OIL IF IT LOOKS LIKE MILK SHAKE YOU HAVE BLOWN HEAD GASKET.

Posted on Jun 05, 2011

SOURCE: my 1999 cadillc deville delegance

Buy a block tester. It hooks up to your radiator and lets u know if exhaust gasses are mixing with your coolant wich would mean u have a (blown head). Do this before you spend anymore money.

Posted on Dec 10, 2012

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Blown head gasket may cause this to occur as exhaust pressure goes into cooling system and builds up pressure over time

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It is best to be systematic about this. It could be either the water loss or the overheating which is the basic cause, either one could come first.

- there is a test for combustion gases in the water jacket, from a blown head gasket. This will very quickly cause overheating, and the excess pressure will blow the water out the overflow reservoir. If the car has already overheated and died, this is unfortunately quite likely

http://www.youtube.com/watch?v=1_SIwHMLmkM


- the temperature sensor in the block may have failed. This will prevent the fans from running when the engine overheats, and you can see this. The fans are not driven by a belt. P68....

http://www.turboninjas.com/camry/eg2.pdf


- the thermostat may have stuck closed. You will have to get it out and test it, but this is not difficult. See p328


http://www.turboninjas.com/camry/eg2.pdf


- this model of Camry has a plastic top tank to the radiator, which eventually cracks. Look there carefully.

- it may be that a radiator hose has gone soft and closed up. Check they are allowing good coolant flow.

- it could be that in a car this age that the radiator has silted up and is not allowing coolant through. Disconnect the top and bottom radiator hoses, when cool, and run water through from a garden hose to get some idea about that.

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you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

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When does it overheat? At idle, or at highway speed? Is the coolant level where it should be? Overheating at idle or highway speed may be a faulty thermostat. If it overheats only at idle then it is likely a cooling fan fault. To determine if the fan is working start the engine and switch the A/C on, the fan should come on, if it does not, then you need to have the computer "scanned" to see if it can detect the reason for the fan not coming on. If the fan is switching on, then you need to have the water pump checked to see if in fact it is pumping coolant (this could also be the cause of overheating at highway speed) If you are overheating only at highway speed you may want to have the enigine checked for a blown head-gasket, or faulty radiator.

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CHECK COOLANT LEVEL FIRST BUT IT SOUND LIKE FAULTY THERMOSTAT OR LEAKING HEAD WILL ALSO CAUSE OVERHEATING WHILE DRIVING.I WOULD REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP FIRST.THAT WAY YOU KNOW IF HEAD GASKET LEAKING.CHECK ENGINE OIL IF IT LOOKS LIKE MILK SHAKE HEAD GASKET BLOWN.

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