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Back pressure could be caused by a number of items.

1st...Bad system hoses (I recommend new ones)

2nd...Bad radiator Cap (this sounds superficial but it matters)

3rd...Leak in the upper radiator (these leaks are not always detectable)

4th...a leak in your heater core (Replace for $50.00)

5th...Air in your Coolant system, (requires purging/bleeding (at the water pump there should be a bleed valve and just past the thermostat)

6th...Leak in the intake (Mechanic needed)

7th...Head Gasket leak (Mechanic needed and $1100.00 dollars as well)

8th...Thermostste is bad and won't open (easy fix $20.00 do it yourself)

9th...Temp sensor is bad (even easier $15.00)

Hope this helps! Adam

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