ry4nolson

In the last couple of weeks when my car is warming up it will go up to 4 or 5 bars (AP1) and then go back down to 3 bars and settle. Is this normal? Could this be my thermostat going bad?

USAF_S2K

not normal, your pretty modded from the looks of it. How old is the coolant and tstat? Maybe time for a good flush and tstat swap. Pretty cheap in my opinion to knock out. Could have some air in the system.

Leviisbigred

air in the lines and or thermostat

Billman250

most likely air, due to a leak. check the rad level.

davidc1

But it only happens as it's warming up?

Billman250

it is not normal.

if the rad is full to the top and your heat is hot while idling, you likely have a bad thermostat.

I'm banking on air/low coolant.

JohnsS2000

air in the system, only takes a small amount. As Billman said, if your heat is not Super Hot it is air in the system

hand banana

i had this same problem in one of my cars, car would warm up, then drop, then warm up and stay at the right temp........air in the lines

Leviisbigred

did i win?

JohnsS2000

BTW. in your mods, i do not see that you have an aftermarket radiator, if you still have the OEM, they split where the plastic top, or bottom is glued to the aluminum. You might have develpoed a leak. If so youll be able to smell antifreeze. I replaced my radiator before it forced me to replace it but getting ALL of the air out(especially from the heater core) can be tricky if you have not done it before.