Question about 1991 Honda Accord

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Coolant flow and exhuast fan

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!

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  • jphilippimcc Dec 06, 2008

    wut do you mean by [stuck closed thermastat or plugged radiator?



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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

Posted on Dec 05, 2008

  • yard3 Dec 07, 2008

    what i mean by stuck closed thermstat is the thermstat is not opening at operating temperature. a plugged radiator is blocked by a build up of sludge or corrsion,either one of those problems will stop the flow of coolant threw the radiator. YARD3



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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

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I have a 92 accord LX. I have replaced the Radiator and the hoses, thermostat and fan switch. Car is still reading hot in a matter of 5 to 10 mins of running. Fluids are topped off. I am not sure why it is...

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.
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When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.


Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.




You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!


Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
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If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost


A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

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