I have a 2001 Chevrolet venture and its over heating the thermostat was taken out and it looks like there is oil in the water


Asked by Nov 28, 2014 at 08:54 PM about the 2001 Chevrolet Venture Warner Brothers Edition

Question type: Maintenance & Repair

7 Answers


That's usually a sign of a bad head gasket. Sure hope I'm wrong.

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Pull the oil dipstick. If there's white milky "goop" on it you most likely have a blown head gasket. Pressure test the cooling system. With the system under pressure start the engine. If the needle on the pressure tester's gauge bounces, head gasket is blown. HTH. -Jim


There is no water in the oil

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I hav the fans hooked up directly to battery

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Do you think what you thought was oil in the coolant was actually melted wax? Automotive thermostats have a wax pellet in their construction to help them operate. Possible to believe your thermostat leaked out the wax which caused it not to function properly.


For sure its a thick sludge. I can clean the cap and the very next stop its back. It collects at cap


Sounds like one of two things is going on. Either someone (possibly a previous owner) put some stop leak junk in the cooling system to "fix" a leak or someone put the regular green antifreeze in the cooling system. You cannot mix Dexcool type antifreeze with anything except an antifreeze that specifically states "all makes all models" on the bottle. Doing so creates a chemical reaction that sludges up the cooling system as it eats your engine from the inside out!! Stop leak products clog up everything. Radiators, heater cores, cooling system passages inside the engine, etc. Don't use them! The only exception to this is the tablets that you buy from your local GM dealer that say AC Delco on the package. They're specifically formulated for use in GM engines such as the Northstar, the 3.8 liter V6, and the 3.4 liter V6. Using anything else, in my opinion, is just asking for trouble!! HTH. -Jim

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