Question about 1990 Toyota Land Cruiser

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Have replaced radiator thermostat and head gasket , now when it gets to normal operating temp it loses power when in gear

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Try a compression test?

Posted on Dec 10, 2009

Testimonial: "thanks i will try that in morning it was running fine b4 radiator blew the bottom tank"


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My grand am still overheats even after i changed the termostat and water pump plus, the fan only runs when the temp sensor is unplugged

I had the same problem with my 1999 grand am .I changed water pump, thermostat. I heard the Pontiac engines , 3.4 had overheating problems one is the intake gasket if your losing water but don't know were its going its leaking at the intake gasket and burning off or if you check the oil cap or the dip stick and theres a milky substance on them it would be your head gasket I had to change my head gasket and while I was there I changed the intake gasket too. I haven't had any problems sence I changed them hope this helps. Jack

Jun 11, 2014 | 1997 Pontiac Grand Am

1 Answer

I have bubbles in the coolant overflow tank when the car is at normal operating temp. When the engine is cold there are no bubbles, only when operating temp and especially after I drive it. I thought a...

If the car is running, you can probably rule out a head gasket. And even if it were a head gasket problem, you'd probably see the coolant level drop and have white smoke coming out of your exhaust. Have you removed the radiator cap and checked the fluid level inside the radiator? The coolant recovery tank is usually connected by a rubber tube to a vent on the side of the radiator fill mouth, and nothing flows through that tube unless the cooling system pressure increases beyond the pressure rating of the radiator cap, or radiator coolant level drops below the full level, in which case additional coolant from the recovery tank will be drawn into the radiator. This does not normally happen until the engine reaches normal operating temperature and the thermostat has opened, allowing coolant to flow through the radiator in order to keep the coolant for overheating. Again, check the radiator level. If it's OK, don't worry about it.

Oct 08, 2013 | 1999 Honda Accord

2 Answers

1995 mitsubishi Galant 2,4 v6 overheating replaced thermostat and flushed system fine for a while with some rise in temp at times now pressurising water out header tank and temp gauge does not move above...

a few things to check before we condemn it as a leaking head gasket(pressurising water out).
First check the radiator cap seal,no cracks and that it takes some pressure to push the spring loaded part down.
Does both the top and lower radiator hose get hot as temp gets to normal(where thermostat should be open).if not,the thermostat may be a faulty one or has slipped out of seat as the cover was bolted back down onto it.(temperature will differ either side of it).I have had some of these come in with part of the waterpump impellor rotted away.same symptom of one hot and one cold hose,and water doesnt flow inside radiator with cap off(ensure this is not removed if engine is hot)and temp where the thermo should be open.
Possibly the radiator needs sending out for the top or side tank to be removed and each tube cleaned out.this is a lot more effective than trying to reverse flush with water only.
But if temp is normal these areas should be fine.
Do the hoses swell with pressure and become hard to squeeze in a short time?this could reveal a leaking head gasket and should be tested with a teekay type tester for the presence of cylinder gases in cooling system.
Do the fan(s) come on if sitting idling at normal temp for 5-10mins?water can be pushed out if they dont come on or their cut in/out temp is incorrect.hope this helps.
let me know some times re when it pushes water out,do you hear a boiling sound from inside engine or radiator when this happens,any other info that may help diagnose.

Feb 17, 2011 | 1995 Mitsubishi Galant

2 Answers

Check engine light on. Does not reach normal op temp. When tested temp steady at 185. Coolant comes out of radiator when cap is off instead of circulating through. Engine surges at idle and idles over...

If the head gasket is "blown" you will find oil in the radiator and water on the oil dipstick, and the vehicle will likely run hot. The symptoms you describe sound more like your thermostat is stuck in the open position. I suggest that you drain, flush, and refill the cooling system, and replace the thermostat before you consider tearing the heads off for a gasket replacement.

Jan 22, 2011 | 1996 Ford Explorer

4 Answers

Engine is running hot what could cause this after changing termostat and water pump

You could have a plugged radiator if your not losing water otherwise you could have a bad head gasket, cracked head, warped head if you are losing water.

Jun 11, 2010 | 2001 Chevrolet Venture

3 Answers

Water pump went out, it was replaced along with new fan clutch, new belt, new coolant temp sensor, 3 or 4 thermostats, and a couple of radiator caps and it gets pretty hot while driving it and when the...

It sounds like you have a partial blockage in the cooling system. If liquid gasket material was used with the pump an or thermostat replacement some of this material may be in the coolant path. Other things to consider; your thermostat is the wrong temperature, you got a bad water pump. Take the radiator off and start the car when it is cold. Let it idle and watch to see if coolant begins to circulate after the engine reaches the operating temperature to be sure the thermostat is working correctly as well as the pump.

Jan 01, 2010 | 1991 Chevrolet S-10

2 Answers

Over heating

try having your radiator pressure checked , or replacing your cap

Sep 12, 2008 | 1997 Ford Taurus

3 Answers

Location of thermostat and replacement

Finding the thermostat is easy. Just follow the top radiator hose back to the engine.
The question I have is how to get to the bottom screw of the thermostat housing.

Any Sugustions anyone?

Jun 22, 2008 | 1999 Volvo S80

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