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Re: High speed heating problem. Have changed water
Do you know the gauge is reliable thats telling you its too hot? 3 things to check: lean fuel mix, timing advanced too far, oil mixture too light. With the alcohol in todays fuel I would add more oil. In 1977 they had better fuel. Alcohol is a solvent, not a lubricant. The tubing may help minimally but the head passages are fixed. Good luck
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Sounds like low speed isn't providing enough water flow to close the pressure switch that allows heater to run. Its unlikely anything has changed in the pump other than a possible obstruction so to troubleshoot by most common failures first, try removing filter cartridges. If it heats on low speed with no cartridges installed then you need new filter cartridges (even if they look ok). If not the pressure switch might need adjusted or replaced. Most pressure switches can be bypassed with a jumper wire to diagnose but should never be left bypassed for normal operation.
Could be your thermostat, also check your fluid level. Also could be your water pump. Most water pumps have a weep hole, if you notice coolant leaking, it's possible you need to change the wather pump or a failed water pump gasket.
If the motor over heats it may be the water pump. A motor will not run very far with a bad water pump or stuck thermostat. Most of the time a water pump won't quit pumping water they leak. If the motor won't get hot enough it is the thermostat.
First of try to understand exactly what part you mention exactly how they work or function
please place a new low speed relay as it try to make out thermal heating cool at it's initial 1st stage level of heating so that the temperature remain maintain if thus it reaches the second level of heating then the high speed relay act at that time & the speed of radiator fan increase to get thermal heating in control.
the thermostat regulate the heating temperature of the engine it senses the temperature & signal to the relay the relay then react according to the temperature level of engine at low heating it operate the low speed relay & high temperature it signal to high speed relay so the engine temperature does not rise to extended level of heating or overheating.
see for thermostat valve is failure if that so replace it new sometime most of the mechanic change it or cancel it so that the temperature does not rise as this thermostat help engine maintain it's ideal temperature which is required by the engine for regular or good working even at extreme climatic condition.
Do check for every tensioner or Ideal Bearing as far consider on the No. of miles or Km the vehicle has run according to us the tensioner or ideal bearing are suppose to be replace at an interval of 30000 to 35000 Km. but this replacement include both Engine timing belt & tensioner & ideal tensioner bearing.
A water pump flow depend on the tension of the drive belt some vehicle come with water pump which drive on inner timing belt tension & some on the fan belt or external tension belt of engine.
for further more FAQ do send in or place your problem we will sort it out till then have a safe drive & happy motoring from siddhanth.....!
If the water pump is pumping you should be able to see moving water/engine coolant in the radiator when the radiator cap is removed and the thermostat is open. Have you checked to see if your electric cooling fan is operating properly?