it over heated replaced radiator therm andwatr pump idles fine drives for awhile then spikes>.what else can it be their isnt any white smoke ?

 

Pull your spark plugs out and take a good look at them, if any have coolant on them or appear to be steam cleaned, you may have blown a head gasket. I just blew one in one over-heat. It's a pain but, at least Rover engines are extremely simple to work on.

 

By the way... how many miles on your truck and what year?

 

thankyou 110000 ill try that tomorrw whats the cost to fix a headgasket?

 

It really depends on what you want to do about them. If you get them done at a garage I think people have reported paying around 1,500 to 2,000. At the stealership, it's around $7,000 but they may just recomend a new engine for $10,000... (absolute joke!). Or, if you do them yourself, it's around $300 for all the parts you'll need and about a weekend or so. Head Gaskets go right around about 60,000 to 100,000 miles depending on the specific engine. Some last longer some not so long, just a crap-shoot really.

 

Do what disc oh no suggested. Pull all your spark plugs and inspect them for coolant, then post back.

You replaced the radiator and water pump yourself, or did you pay someone to do it? Just trying to gauge where you are turning wrenches etc.

 

There is also a chemical test you can buy for $50 at the auto parts store that tests for combustion gas in the coolant - which confirms the HG leak issue, before you tear into things. No ticking? Hope you have not overheated AND slipped a cylinder liner, which usually starts the dreaded "tick".

Now if faced with a brand new radiator and water pump and thermostst, and engine killing spiked overheating, AND you need to wait until a better time (but still soon) to do this head gasket work, you might try one of the head gasket fix products, as a stop gap measure. Your radiator is new, so it probably won't clog up. Don't buy the $10 stuff, buy the high priced spread if you plan to try this (Bars makes some $30 - $60). It is unlikely that you will make things worse at this point. I seldom tell people to do this, and usually only as a last stand. Older radiators will plug up because of all the calcium buildup coating them already.

 

2 tests to run, first a coolant pressure test, then a chemical block test, then get back to us, quit guessing, you are only costing your self time and money.
In the mean time quit driving it.