Overheating at a stable 220F?

[bettabruce]

My 1975 K5 is running at 220 all the time.

I've replaced the thermostat and had radiatior recored.

Is 220 acceptible temp in 75 degree ambient weather?

I have a pretty much stock 350.

Thanks in advance for input.

 

[pauly383]

nope , a hair over thermostat temp shouldn't be a problem in agood cooling system .

Look the system over again . Maybe a fan clutch or something is working right , provided you have already made sure you have no leaks .

BTW , when was the last time it was flushed , and does it have coolant or straight water ?

 

[tRustyK5]

Have you determined that the temp guage is accurate? The factory guages are notorious for being hard to trust (especially after 32 years.)

Rene

 

[pauly383]

I always overlook the easy stuff , as I fixed those things years ago when I bought my Blazer .

Yup Renes correct , verify the gauge first and foremost .

 

[mr.smartass]

Do you have a fan shroud, or body lift? Guess it could be alot of things but... you get one of these for being from MS! (nothing says cool quite like the "cabbage patch")

 

[littlejimmythatcould]

What size thermostat are you running? I run a 190 and my truck likes to hang out around 210 or so when it gets hot, and it's only a year or so old.

 

[TexasBlazerBoy]

Do you have a fan shroud

Yup........

 

[bettabruce]

problem solved

turns out that my aftermarket SunPro gauge has let me down.

It reads 120 when the engine is cold, so it must be escalating the

reading a good 20 to 50 degrees. Thanks for all the ideas.

 

[4X4HIGH]

turns out that my aftermarket SunPro gauge has let me down.

It reads 120 when the engine is cold, so it must be escalating the

reading a good 20 to 50 degrees. Thanks for all the ideas.

Buy the best guage (Autometer) and don't look back.