OVERHEATING

i have a 95 caprice wagon that i can drive 4-5 blocks before the temp gauge goes from cold to hot... now when i pop the hood the upper and lower hoses are cold the little ones that go to the heater core are warm but not hot like i would expect from the gauge reading...any ideas???  

Bad ground or temp sensor. Ground is free and the sensor is cheap.

There are 2 coolant temp sensors on the LT1's. One is on the passenger head and the other one is on the water pump (pump one powers the gauge on the dash). Check the wires.

thermostat stuck closed?

benn wrote:

thermostat stuck closed?

I've run a 'failsafe' t-stat for so long, I forget that this is an option..... Thanks for the reminder....

i got a new thermostat and it still does the same thing..

any way to make sure the water pump is working... the hoses from the radiator are cold but the temp gauge says the car is overheating the hoses that go to the heater core get warm but no heat

Superior Finish wrote:

Bad ground or temp sensor. Ground is free and the sensor is cheap.

There are 2 coolant temp sensors on the LT1's. One is on the passenger head and the other one is on the water pump (pump one powers the gauge on the dash). Check the wires.

Unless they are different, my 94 has the idiot light sensor (probably the same location for gauge equipped cars) on the passenger head, just above the starter and the computer (ECT Sensor) is in the waterpump.

Bill

convert2diesel wrote:

Superior Finish wrote:

Bad ground or temp sensor. Ground is free and the sensor is cheap.

There are 2 coolant temp sensors on the LT1's. One is on the passenger head and the other one is on the water pump (pump one powers the gauge on the dash). Check the wires.

Unless they are different, my 94 has the idiot light sensor (probably the same location for gauge equipped cars) on the passenger head, just above the starter and the computer (ECT Sensor) is in the waterpump.

Bill

I could have sworn it was the other way around. I have been wrong in the past.  

I REPLACED BOOTH AND STILL DOES THE SAME THING

Cold hoses suggest to me that the core is plugged, so there is no flow. I would flush the heater core. Disconnect the hoses and flush the core backwards (ie: force water into the outlet, discharge from the inlet).

any chance you have a air bubble. did you put new antifreeze in the car recently? have you tried the air bleed in the thermostat housing? you could always get one of those temp probes that you point it at a object (block) and it will tell you its temp. harbor frieght sells them. that way you could tell if its the gauge. just bouncing some ideas around . good luck let us know how it turns out