My 2003 chevy blazer with now almost 99,500 miles would blow cold air and temp guage went 3/4 way up, slowed down and stop and went down to normal, drove again and started blowing warm air but stopped again. Noticed that 2 days before it would blow cold air but the temp guage did not go up. What could it be?

I did have my blazer's cooling system flushed? Could it temperature sensor?

 

Low on coolant? Check the lower intake mani for a obvious leak, the water pump and any hoses. Also your oil look ok and not like peanut butter?

 

Ok, went to look and saw I do indeed have a leak. Couldn't pinpoint where its coming from, but in a earlier post that I mistaken for an oil leak, its is dripping off at the where the engine and transmission meet and is appearing to be coming from the top. Oil looked fine on dipstick. Didn't have color of peanut butter.

 

Sounds to me that the intake gasket has failed!!

 

Is any fluid leaking into the passenger front floorboard? If so your heater core is out.

 

Had it at the garage and it was the intake manifold. Cost me $550 to fix it, plus $250 to replace the distributor. GM is now on my wrong side for using plastic gaskets.

 

Ready for a plot twist? The new ones are plastic too

 

talon2g, please explain what you are saying. I not getting it. All new vehicles are plastic or the my new gasket is plastic? If its the latter, the mechanic told me, my new one is metal.