Engine Cooling problem
1995 GMC Truck V8 Two Wheel Drive Automatic 189000 miles
I changed my radiator in my GMC Truck, 350 engines and afterwards the temperature will not get above 160 degrees. It is affecting my engine performance and gas mileage. I have changed my t-stat and temperature sensing unit and it still runs at 160 degrees. I made sure the t-stat was a 195 degree as well. When I replaced the radiator it appeared to be exactly the same. Everything fit perfect, the thickness, width etc. Was the same. Is it possible I got the wrong radiator?
Oh, I have also noticed problems with my transmission not wanting to shift since the cooling problem started and the engine idles up when this happens. After I stop the engine and wait a while, it runs normal. I may do this once every couple of weeks.
The replacement radiator, was it new, Oem replacement? I'd have to double check the engine temp, your gage may not work correctly. Is there circulation through the radiator? Do the heater hoses, get hot? Any applicable trouble codes?
March, 19, 2010 AT 2:31 PM
No, it was not OEM. I checked the temperature of the engine where the thermostat house is with an infrared thermometer and it read around 170 degrees. I noticed the radiator cap does not seem to be getting hot at all, even after I have driven for 1/2 hour. The radiator hose registered around 140 degrees going leaving the radiator. I am going to see if any trouble codes show up this weekend.
March, 19, 2010 AT 2:41 PM
Sorry, it was a new radiator, but not from the dealer.
March, 19, 2010 AT 3:02 PM
Is the radiator cap new? What is the pressure reading on the cap?
March, 19, 2010 AT 3:19 PM
No, the radiator cap is not new. In fact, it is probably 8 to 10 years old. I do know that there is pressure on the hoses and coolant pulls into the radiator from the overflow tank.