Join Date: Jan 2012
Location: Jersey Shore, NJ
This is confusing. Are you saying that taking 20-30 minutes on the highway to get hot is good or bad? By hot do you mean "warning light" hot or just heat coming out of the heater?
You said you tried a new water pump and it got hot in 5 minutes at idle. That's because you needed to bleed out the air.
Then you bled the system over and over (good) and now it gets hot in 30 minutes ... again, hot as in "warning light" or hot as in ouch.
Do your fans come on automatically, or just with your switches?
What exactly is the problem?
The hoses should feel very hard when hot. Like a rock depending on the brand. This is normal.
The coolant will expand when it gets hot causing the air in the coolant tank to become compressed (max 16psi). Coolant does "not" compress ... air does. You MUST have air in the top of the coolant tank.
Expecting the coolant to "go down" measurably when you accelerate is incorrect ... unless you have a lot of air in the system. You should not really be able to see the level change much till it gets hot. It will then rise and without the cap, spill over.
Running the engine hot without the cap is not advised. This coolant will hit boiling and not be able to cool the engine. The cap lets the temperature get above boiling.
And of course, never remove the cap when the fluid is hot. If the temperature is over boiling, you will see a violent explosion of fluid in your face.
Did you put the correct t-stat in? It is a two stage device with a small bleed hole. It matters.