1992 blazer k1500 under heating issye

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Feb 18, 2022 | 08:53 AM

k1500greece

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Joined: Feb 2022

Posts: 3

1992 blazer k1500 under heating issye

Hello, I have a Blazer Silverado K1500 5.7 and I have a problem with the temperature . The car can’t get more than 75 C in any condition. So far, I have change everything! The radiator, the fun clutch, the thermostat (which’s opens at 98 C).

Feb 18, 2022 | 07:44 PM

GeorgeLG

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Joined: Jan 2007

Posts: 4,631

From: Florida

This can be:

A faulty temp sensor/sending unit
A bad dash cluster gauge
Faulty wiring
Air in the cooling system
A bad thermostat

Does the dash heat act normally on full heat?

How does the truck run?

George

Feb 21, 2022 | 02:11 AM

k1500greece

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Joined: Feb 2022

Posts: 3

hello George
the sensor and the dash clucher is ok. i dont have air in the system. the thermostat is new!!!
its a crazy situation!!!!
i thing i will put a electric fan to end this problem

Feb 21, 2022 | 07:00 PM

AJBert

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Joined: Oct 2007

Posts: 2,871

From: In the Colorado mountains

Did you test the new thermostat to see what temp it opens? Believe it or not, not all new thermostats work as advertised.

Feb 22, 2022 | 06:41 AM

k1500greece

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Joined: Feb 2022

Posts: 3

yes!!!! also this is the 3rd thermostat i put!!!!
i star thinging that something is wrong with the fan clutch... which is also new... but i made the test that i read, and it seems that is ok!!