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Old 13 Jun 2009, 01:01 am
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Default i have a 1991 acura legend my cars heat jumps up and down it doesnt stay stable?

i replace the radiator and the thermastat and its also runnin on one coolling fan
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Old 13 Jun 2009, 01:46 am
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Sensor or relay for fan
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Old 13 Jun 2009, 02:01 am
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the seccound cooling fan is a backup incase the car gets way to hot, this fan once it has come on will not turn off until the car is cool even after you turn the car off, as for the heat if it isent getting to the H matk on the gage i wouldent worry to much about it.
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Old 13 Jun 2009, 02:16 am
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There is a bleeder screw next to the thermostat housing . You need to open it and leave it open until you see coolant coming out the screw. The system has air in it that is what is causing the temp fluctuation. If you open the screw and don't see any fluid, add coolant until you do.
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Old 13 Jun 2009, 02:31 am
Les Les is offline
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Your cooling system consists of the following items:1. Water pump2. Radiator3. Thermostat4. Radiator cap5. Hoses6. Fan7. Temperature switch8. Temperature sending unitRunning on one cooling fan is normal as the other fan is associated with the air conditioning system. Yes, it could very well come on when heat reaches a high setpoint.You have a few known things...1. Your radiator is obviously good because it's new.2. The thermostat should be good too because it's new but do not discount that you could have a bad new one. Also, is it installed correctly? In some applications it is possible to put it in backwards. It should also have a little hole that should be positioned to the highest point up. This allows for purging the system of air.3. The temperature switch is good because the fan comes on.4. The hoses are good as you speak of no leaks.5. The radiator cap seems to be holding as you speak of no release of coolant to the reservoir tank.This leaves you with only a few things...1. A bad water pump2. A bad temperature sending unit3. Air in the system.Getting the air out of the system is easy... See the following link and check out item #12. #12 is the bleeder bolt. With the engine cold (and the thermostat installed correctly), take the bleeder bolt completely out and ensure that it is not clogged. With it clear, reinstall it loosely (about one turn from fully tight). Remove the radiator cap and add coolant until coolant comes out of the bleeder bolt. Tighten the bleeder bolt once no more air comes out. Completely fill the radiator and put the cap on. Add coolant to the proper level in the reserve tank.Start the engine and let idle until the temperature gauge indicates normal and the fan has come on. With any luck, the system will be stable and your problem will be gone. If the problem remains, your most likely problem would be the water pump but it could be a faulty temperature sending unit also. See the following links:Water pump: sending unit:I couldn't find the diagram showing the sending unit but it is part number 37870-PJ7-003 and sells for $26.80Good luck!
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