monterety thermostat

[oldstoat]

Hi

My dear old monterey is exhibiting an odd symptom The temp gauge in the dash keeps leaping from normal to high v hot and sometimes sticks at that point. I have checked the bottom hoses and they seem to be hot, but i suspect that the thermostat is sticking and needs replacement. Is the thermostat housing the large dome shaped casting at the front of the engine? And as an interim measure can the car be run without a thermostat or is that a bad thing to do. This is an N reg 3.2L petrol V6 24valve Isuzu engine

Cheers peeps

[oldstoat]

does anyone have any ideas please

[robinhood21]

oldstoat said:

Hi

My dear old monterey is exhibiting an odd symptom The temp gauge in the dash keeps leaping from normal to high v hot and sometimes sticks at that point. I have checked the bottom hoses and they seem to be hot, but i suspect that the thermostat is sticking and needs replacement. Is the thermostat housing the large dome shaped casting at the front of the engine? And as an interim measure can the car be run without a thermostat or is that a bad thing to do. This is an N reg 3.2L petrol V6 24valve Isuzu engine

Cheers peeps

Is the engine overheating though? Back pressure causing water to be expelled through the water reservoir? Or is it just a dodgy heat sensor?
Not familiar with the engine, but it does sound like the domed housing is where you will find the thermostat.
Running the engine without the thermostat will not harm the engine - just so long as you do not rag the engine until normal temperature is reached - it will take longer for engine to warm up without said thermostat.

TBH, this would have more answers if posted in the General Gassing section of PH's

[GreenV8S]

If the temperature gauge really is changing suddenly then it's far more likely to be a problem with the sensor. Engines don't tend to change temperature quickly. I would check for obvious symptoms of overheating such as the fans staying on, pressure cap starting to vent steam, check that the heater still blows hot air (proving you have coolant circulating) and if that all looks good then start looking for electrical problems. The first place to check would be the temp sender itself, since this would enable you to tell whether the problem is the sender itself, or the wiring/gauge.