1995 Chevy Blazer Temp gauge reads 240

Tiny
TOTALURBANPERFORMANCE
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 214,000 MILES
I recently changed the heater core in the blazer. Also replaced the thermostat and heater hoses. Before the change the gauge would read 200-210 and stay steady. Now the gauge will go to 240 and does not blow hot air at all. If I feel the heater hoses, they are cool, the upper hose sounds like air is in the system, the lower hose is warm but not unbearable. I am wondering if I might have a blown head gasket on the exhaust side. I tried the block tester but had to put it in the overflow tank not the radiator as I do not have the adapter. When testing this is remained blue but still think it needs to go in the radiator not coolant tank.
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Saturday, March 6th, 2010 AT 12:42 PM

2 Replies

Tiny
LEGITIMATE007
  • EXPERT
Well be sure that you have diluted your coolant 50/50, and try puttting a new cap on it, also bleed the system, air pockets will make the system cool. You wont have any heat etc.
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Saturday, March 6th, 2010 AT 1:28 PM
Tiny
LEGITIMATE007
  • EXPERT
Your engine coolant temp sensor, is a sending unit, and gives the reading on the dash, but I dont think it is faulty at this point, there is only a twenty degree diff. Thatn before
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Saturday, March 6th, 2010 AT 1:31 PM

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