P0128

[clariveros]

Hello all,
I have been diagnosed with a P0128 Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

I am going to change the thermostat tomorrow because i am pretty sure that it might be just that, it was 7º here yesterday and it took for ever to warm up enough so i would not freeze in the car, my question is what else should i look at as the cause of this problem?

[mike2004tct]

Originally Posted by clariveros

Hello all,
I have been diagnosed with a P0128 Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

I am going to change the thermostat tomorrow because i am pretty sure that it might be just that, it was 7º here yesterday and it took for ever to warm up enough so i would not freeze in the car, my question is what else should i look at as the cause of this problem?

Death-Cool.

Oops, I mean Dex-Cool.

Replace it all if it's still the original stuff. 5yr/50k miles is the suggested replacement (I think the General suggests 100k miles, don't listen to him)

Personally, I'd replace it before then, others will chime in.

[BlazerLT]

Originally Posted by clariveros

Hello all,
I have been diagnosed with a P0128 Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

I am going to change the thermostat tomorrow because i am pretty sure that it might be just that, it was 7º here yesterday and it took for ever to warm up enough so i would not freeze in the car, my question is what else should i look at as the cause of this problem?

How long was forever?

[clariveros]

Originally Posted by BlazerLT

How long was forever?

about 40 minutes

[clariveros]

Originally Posted by mike2004tct

Death-Cool.

Oops, I mean Dex-Cool.

Replace it all if it's still the original stuff. 5yr/50k miles is the suggested replacement (I think the General suggests 100k miles, don't listen to him)

Personally, I'd replace it before then, others will chime in.

Yeah i also figured it was about time, oh yeah dex-cool does suck. it is more expensive too.

[BlazerLT]

Originally Posted by clariveros

Yeah i also figured it was about time, oh yeah dex-cool does suck. it is more expensive too.

Again, Dexcool is not worse or better than any other coolant on the market.

People that have problems with it in most cases haven't kept their maintanence properly up, have failing parts or haven't checked the cooling system often enough.

One thing you need to do is replace the bad stock rad cap with a stant or something NOT AC Delco.

And don't blame the coolant for the thermostat.

How old is your truck?

[clariveros]

the jimmy is a 2001 and i do have a non stock, and the coolant is not the problem i know that i just know that it is not the wonder that GM claims it to be

[BlazerLT]

Originally Posted by clariveros

the jimmy is a 2001 and i do have a non stock, and the coolant is not the problem i know that i just know that it is not the wonder that GM claims it to be

GM is not making is seem to be the best. It is the most compatible with their gaskets and seals in the cooling system.

When the cooling system is properly maintained, this coolant does perform and reach its 5 years.

[clariveros]

OK i fixed it!!! Hooray Beer!! ooh wait hooray me. yeah it was the thermostat, i put the new one in and i worked like a charm. that heater is wonderful now.

[BlazerLT]

How old is the coolant again?

[clariveros]

Originally Posted by BlazerLT

How old is the coolant again?

less than a year

[BlazerLT]

Sweet, replace your rad cap with some not ac delco and enjoy your warm truck.