I have replaced the radiator , themostat,water pump,belts,all hoses, flushed motor, checked that waterpump is flowing and it is, and even replaced complete temp guage, and finally replaced fan clutch twice and this car is still overheating after it has been warmed up and driven for 25 min. I have no water in the oil and motor runs good......Im at a lose for what to do. ANY suggestions?????
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Re: Cressida still pegs temp guage????????
1st do you loose water from the header tank or water dripping anywhere under car when stopped yes or no if yes to loss of water from h/tank then the problem is you have a Head Gasket blowing compression into the water jacket next to the cylinder,and its only small now but will get worse very soon, so get the Head removed and cracked tested and Head surface ground . Ron
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You mean the car is running fine but just No Heat? If so -Sound like the heater hoses are plug. or the control valve is no function
-Check the heater control valve and flush the heater unit with water of garden hose from both directions. Q: How do I know that is working or not? A: Slide the heater control from Hot to cold or cold to hot and check it turn or not. (If not turn at all. The cable is broken or slip off)
You may have a blown head gasket. They can leak outside the motor, inside the cylinders (causues white smoke), or into the block causing water in the oil (light brown color and or bubbles on the dipstick) or oil in the radiator. Hopefully you have none of those, so the next step is a radiator flush as you probably have something clogging up the radiator or thermostat. You have to drain the radiator and fill with clean water. Pull out the thermostat and leave it out for the flush. There are radiator flush products that I suggest highly. Run the truck to operating temp (about 20 min) with the heat on and dump the system by removing the bottom hose hose from the radiator, after the truck cools off. With the hose still off dump water through the radiator to clean it out fully. fill with water and let it run once again to clean the block, then reinstall new thermostat and anti-freeze. This should clean out any rust and stop leak that is causing your problems.
try flushing your coolant system. if you have air compressor.remove hoses to heater core and try ro blow it out. also with the car running see if the hoses are the same temp. if not try blowing out the heater core. also start the car and see if the water pump is pushing water out of the hose goimg to the heater core. also a bad radiator cap could keep it from heating up.let the car run and see if the top hose gets hard to where you can not squeeze it. if you can than replace the radiator cap. hope this helps leave comment.
have you replaced yor thermostat? have you checked your radiator cooling fans to see if they are coming on while your car is heating up? when your temp. guage is halfway up your fan should come on. you can check fuses and relays in fuse box[black box under hood drivers side] check those to see if fuses are blown or if fan relays are coming on[ticking while engine heating up]radiator could need flushing out also, just narrow your search some by elimination. if you open radiator cap before you start engine,then start motor, let it warm up.look for circulation,,flow of fluid,bubbling, then thats a sign it's circulating,thermostat is good. no flow means that thermostat not opening,thats bad thermostat.replace the thermostat.if not that are fans coming on? when engine at mid range on temp. guage does fan come on? if not check fuses @ fan relay. if fan comes on ,it's good.check water pump pulley for wobbly pulley while motor not running, shake pulley back @ forth for play. any play in pulley means bad water pump. are the belts on? i went through everything i would look for myself. hope this finds your problem!!!!
Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.
The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.
So, other components which are likely to cause hot readings (in this order) are:
- lack of coolant (or leakage somewhere): is there sufficient green coolant at the correct level? Top up mixture to correct level. Repair any leaks.
- collapsed radiator hose: when engine is cold, start engine, then quickly watch both upper & lower radiator hoses to see if either begins to flex inwards (collapse). Replace if either hose is collapsed.
- bad/incorrect thermostat rating : when replacing thermostats, you must ensure it is of the SAME temp rating (they all differ).
- Incorrect Temp sensor rating: the ratings of this sensor must be within manufacturer's spec's.
- bad waterpump: the engine relies on the waterpump to distribute the coolant throughout the entire system. If waterpump is faulty, coolant will not flow quick enough, causing overheating.
If you still believe all of the above components are OK, then have your cooling system "pressure tested". This test should be done, before looking further at other electrical components.
"if this has helped you in any way, please rate this solution"
Your overheating problems can have several possible causes.
1) Airlock in heating system - solution - bleed air from cooling system. Method is dependent on make/model of vehicle
2) Radiator blocked - solution - drain and flush radiator
3) Failed waterpump - solution - fit new waterpump
4) Engine thermostat stuck in closed position - solution - fit new thermostat
5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors
6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage.
7) Faulty temperature gauge giving incorrect reading
Sorry to hear it wasn't the thermostat, Other possible causes inlcudes low coolant, water pump and or waterpump belt, radiator blockage, and radiator cap not maintaining pressure. Check you coolant level first, fill if it's low, typically if it was the pump you would devolop a coolant leak as the pressure builds in the pump assembly. Check the belt though, any squeaks while running? Also if the seal in the raditor cap is bad then no pressure can build. To test the pump remove the raditaor cap (ensure the motor is COLD!!) and start the motor w/o the cap installed, watch the coolant level as it is should be going down slowly as it pumps through the system. Also check the seal on the raditor cap for any cracks's or visible damage.
The temp sensor is a possibilty but a rare one at that.