Coolant pipe pressure

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Hotboxcivic

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Hello, my nav is experiencing almost immediate extreme pressure in the coolant pipes and strong pressure build up in the reservoir tank even after days without driving. I assume that the pressure in the tank is normal as it has a radiator cap. Do all nav's experience this? I'm trying to diagnose a no heater problem (only heat under load) and want to rule out a blown head gasket. Cheers
 
I'd look at the head gasket.

Coolant pressure doesn't build up straight away, and a lack of heater function generally means something's awry in the cooling system - usually a blown head gasket or cracked head.

There are solutions.

Cheap - Chemweld/Liquid Copper
Pros:
- cheap
- fast
- may point to the leak (particularly Liquid Copper)

Cons:
- may not last forever

Mid-range Expensive - eBay preassembled head
Pros:
- cheaper, at about $1200 without fitting costs
- fully assembled with valves and camchains all shimmed and ready
- usually come with full gasket kit so installation is easy

Cons:
- It's not a genuine head and may be of inferior quality (see * below)
- Warranty is an unknown, they say it does have one but I've not tried it

Expensive - Genuine Nissan Parts
Pros:
- It's going to be correct, 100% and no need to fear about it at all
- It's going to work like new
- Nissan warranty will be guaranteed

Cons:
- Expensive. Nissan know you need it and extract $$ accordingly
- Their service droid does the work, not necessarily an experienced mechanic

* Note: I've had my head replaced. Got a cheapy off eBay. Mechanic who did the installation said it was perfect, had all but one gasket and that was easy to source. I've put about 20,000km on it since and it's been perfect. Almost better than new. Mine was $1200 delivered, about $2500 to fit (including disassembly, plus new water pump and new thermostat).
 
Thanks for your reply. Already gave the rislone copper fix a go. Didn't change anything. Was hoping for a different answer, full well knowing the head gasket is probably gone.
 
Happened to me. Was an internal failure in the EGR cooling pipe. Exhaust gas straight in radiator circuit. Blew out all coolant in seconds. Had to recondition motor. Cooling pipes to EGR cooler can be looped to bypass the cooler . Then fitted an EGR blanking plate. All good.
 
Sounds like Lex Smith is all over it, just adding that my D40, seems to only really provide decent heat to the heater core when under load, it's always been like this..
 
Looped the coolant from the egr pipe back onto itself. Still built up massive pressure in the coolant lines coming off the radiator. Again, hoping it was the egr pipe as the blanking solution is far cheaper than new head gasket but it's not the case.
 

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