Ok, i replaced the temp switches and water pump on my 91 accord dx but when i run the car the top of the radiator gets hot but the bottom doesnt, also my fan doesnt turn on when my radiator does get hot. It's been doing this since i got the car and i also replaced the fan being the old one melted off the shroud. I also replaced the relay so im really stuck on this one. If anyone has a solution to this problem i can get my car on the road finally lol.. Please resond asap. Thanks!
Leave the radiator cap off till it reaches operating temperture,check for bubbles in coolant,if you have bubbles [bad head gasket] or check for the coolant curculating,if not curculating [stuck closed thermasat or plugged radiator
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could be or the thermostat getting stuck check your cool in fan motor too and sensor it all works in conjunction any if the radiotor is bad you should replace the thermostat .good luck.hugos1915 @live.com.
First pressure test the radiator for leakage throughout the cooling system (or Blockage) then you should have it checked for flow percentage. If that all checks out do a complete flush making sure to use the correct anti freeze. (providing you have checked rad fan switch, cool temp sensor, and cap.) If there is no water showing in the oil then check for bubbles in rad while car is running. Just make sure by vin # that you use the correct antifreeze because adding or mixing the green and red can cause gelling in the coolant system.
Is the thermostat installed up side down. That does happen sometimes and will cause that.
Is the radiator a new one if not could be plugged and won't let the antifreeze flow.
Is the water pump functioning right. Check your belts as well.
Is the fluid in the rad up where it should be. Low fluid will cause the water pump to not work. Just thoughts of what would cause your problem.
If you have no air in the system, cooling fans & water pump are working properly, and you didn't install the thermostat backwards, you could have a head gasket problem. Also, make sure the gauge is reading correctly, and the engine is actually hot & the gauge is not giving you a false reading. If you installed the thermostat upside down, it will not open to allow coolant to circulate. This 5-10 minute time frame you give points to a water pump or thermostat. I hope this helps.
The core pipes in your radiator may be blocked with particles of junk. There is no easy way to clear them other than to remove the top and bottom tanks of the radiator and push a rods through the individual pipes to push out the junk.
You could try back flushing the radiator, that is force the water back through the radiator the oposite way it normally goes with a high flow hose.
I presume the engine is actually overheating -(not just a temperature gauge sender issue - check for poor connection at sender).
If so, go through the checklist following:-
1) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok,
2) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle. 3) Check coolantreservoir pressure cap is serviceable, 4) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on). 5) Check condition of radiator core:- i) for blockage of air flow to (bugs/grass etc), ii) for core internal blockage to coolant flow,
The coolant temp sensor tells the computer tempurature of engine at all times.It tells the coolant fans to come on,and also very important,when to cut off.If the fans don`t go off by them selfs,then temp is not going down.Now this is if the ac is off,cooling fans come on any time ac is turned on,so check for fans coming on and off with ac off.A bad coolant sensor would cause the fans not ot come on,but not to cut off nessasaralyCoolant systems must be bled of air trapped in systemfor the engine to be cooled .If air is in the system,the coolant won`t flow correctly.
does the fan come on when supposed to? you could hook your fans to a toggle switch and run them manually from start to finish this may help. also did you bleed the system after replacing these parts and purge all air from cooling system? is the coolant coming out of the resovoir hose?