Question about 1997 Chevrolet Lumina

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I have motor oil in my radiator and water reserve but no water in my oil, what could be the problem. Can an intake valve that is stuck cause this problem

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Try doing this shut down your vehicle and let it cool open the radiator cap start your car and rev up your engine while remaining in neutral gear and hand brake being applied if bubbles appear in the radiator then the head gasket of your vehicle has blown (it usually happens when a vehicle over heats) there is also a possibility that the oil cooler of your vehicle has leaked furthermore, a stuck intake valve may also have damaged the cylinder head and the relevant piston as well as the cylinder liner/block. this thing needs immediate attention and a good job from a qualified technician.

Posted on Mar 12, 2011

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Your problem sounds like the transmission oil cooler lines,which are located in the radiator tank itself inside the radiator,has a leak which means the radiator needs replacing and the cooling system needs a good coolant flush to get all the oil out of the cooling system,be aware that you may have to replace all the rubber hoses as the oil will cause the rubber to swell and come apart,there is no connection between the cooling system and the valve system in any motor as they are completely separate systems

Posted on Mar 11, 2011

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Most likely, you have a cylinder head gasket leak. The gasket can leak in such a way that oil is pumped into the coolant or coolant into the oil or both ways at the same time. It just depends on the location of the leak--and whether it is on the compression stroke or intake stroke (under vacuum). A cylinder compression test would be able to verify this.

Posted on Mar 11, 2011

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2nd the motion of the transmission cooler. although both situations are very possible. you can check your trans fluid to check if the cooler is at fault. if its the trans cooler at fault, you will need to replace the radiator and do a trans flush

Posted on Mar 12, 2011

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Oil in radiator , but there is no oil and water mixing in sump

I am assuming its motor oil and not transmission fluid, right ?
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Overheating coolant boiling out into reserve tank

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Possibility of a cracked block. how can i be sure/

Vehicles: Any with the above symptoms

A cracked cylinder block will cause either:
(a) motor oil contamination of engine coolant
(b) coolant contamination of motor oil
(c) white exhaust smoke, due to coolant seeping into one or more cylinders.
(d) more than one of the above
(e) all of the above

Oil infiltrating into coolant is easy to see - drain some coolant out through the pepcock at the bottom of the radiator, and place it into a styrofoam coffee cup. Oil droplets floating on top of the green (or orange) coolant are easily seen. Or visualize oil by looking into the top of the radiator through the radiator cap.
Coolant infiltrating into and mixing with motor oil will permanently damage the engine (seizing it up through loss of lubrication), and must be prevented.
A leak from above the front suspension is, as physicians like to put it, "nonspecific", with the most likely cause a water pump seal or hose/hose connection.
A leak from near the fire wall will usually be a heater core hose, or hose connection.
A coolant leak on the same side of the engine as the water pump is a leaking water pump or water pump seal until proven otherwise.

To rule out everythng else, here's the 1999 Honda CR-V Troubleshooting Guide for Coolant Loss/Coolant Leaking:

Priority Action Part Type Cause
1 Inspect Water Pump - Worn, Cracked or Leaking Water Pump, or Water Pump gasket.
2 Inspect Head Gasket - Leaking Head Gasket.
3 Inspect Radiator - Leaking Radiator Hose(s).
4 Inspect Radiator Cap - Worn or Damaged Radiator Cap.
5 Inspect Radiator Hose - Ruptured, Cracked or Leaking Radiator Hose.
6 Inspect Freeze Plug - Leaking Freeze Plug(s).
7 Inspect Intake Manifold Gasket - Leaking, Worn, or Damaged Intake Manifold Gasket.
8 Inspect Water Outlet - Cracked, Leaking or Damaged Water Outlet.
9 Inspect Heater Control Valve - Leaking or Faulty Heater Control Valve.
10 Inspect Radiator Drain Pepcock - Loose, Damaged, or Faulty Radiator Drain Pepcock, or Pepcock O-ring.
11 Inspect Engine (DOMESTIC ONLY) - Cracked Cylinder Block Leaking Coolant into at least one Cylinder, causing white exhaust smoke.

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1 Answer

Over heating could it be radiator fan motor?

Three quick ideas. Make sure the vehicle sits overnight and check the radiator fluid level
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should always be fluid in the reserve tank.

Second, radiator cooling fan not coming on. If your air conditioner is not working well at
stop lights, then this is usually the culprit, since the fan helps to move air across the air conditioning coils. Everybody replaces relays but generally it is the motor becoming intermittent, since they are open framed and exposed to the elements.

Third is the thermostat may be stuck in the closed position, which will cause overheat.
Hope this helps.

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86 nissan pickup 3.0 5speed 4x4 and i got oil in the water and none visible on the dipstick though,,,i also seem to have lost oil pressure but the light isnt on just low guage and when i got home valves or...


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My mutsuibish shogun 1994 v6 keeps overheating and building up so much pressure that it keeps spliting the radiator hoses???????? PLEASE HELP

ur car is overheating because it does not have the capacity to dissipate high coolant temperature from ur engine to ur radiator or heat exchanger/ check auxilliary fan operation/ if electrically operated check fuse or motor condition/ if no motor check fans silicone oil/ could be too less/ check radiator condition it coul be blocked that why it restrict coolant flow/ check thermostatic valve condition could be stuck up and restrict coolant flow to the radiator...check coolant reservoir if water has oil in it/ if it has oil in it then ur engine cylinder head gasket is broken....

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Too much smoke coming from the exhaust

chk your PCV valve. If faulty it will allow oil to be sucked up and burned. Its the critter stuck into the valve cover and has a rubber hose on it. Good

luck, Ned It's an easy fix and inexpensive. So not to panic.

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