98, Audi 2.8 OVERHEATING

SANDRO

MEMBER
1998 AUDI A6

I HAVE A 98, AUDI A6 WITH A 2.8 ENGINE AND IT HAS 125,000 MIL. Wich is overheating the recnt parts that I replaced was the engine coolant tempeture sensor ( I replaced the coolant sensor becuse thats the only code that I recived from my diagnostic reader ) and I also replaced the thermastat and finally I replaced all of the coolant hoses.

as I drive the car on the freeway for about 15 min the heat gauge arrow stayes in the middle of it and whene I have to stop at a intersection the arrow markes hot but whene I get moving agian it goes back to the middle and when in done using the car it goes back to hot agian.

the diagnostic read is also reading a missfire, and in the same cylinder where it, s missfiring there is a leak of oil in the spark wire hole its not the gasket thats connecting the block to the head its anther diffrent gasket

what I replaced in this section of the engine is the spark plug the spark wires and tha coil assembley and finaly I replaced the battire

thanks

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Replace the thermostat and then comeback if needed.

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Monday, August 13th, 2007 AT 3:41 AM

SANDRO

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5 POSTS

Thanks a hole lot for answering my qustion

but I have alredy replaced the thermastat just last month and I also replaced the coolant tempature sensor and all of the coolant hoses.

Thanks

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Monday, August 13th, 2007 AT 3:52 PM

RASMATAZ

MECHANIC
75,992 POSTS

Could be the Stat, run the engine w/o it and see what happens-don't work do below:

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat, Pressure test the Rad. Cap, Clogged radiator, Fan clutch, Radiator electrical fan, collaspe hoses, water pump.

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Monday, August 13th, 2007 AT 4:46 PM

SANDRO

MEMBER
5 POSTS

Thanks for replying agian

so what does (stat) mean

and would you know how much it will cost for the block and pressure tests or is ther a way you could do it yourself
and what are the singh of a blown head gasket

thanks

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Tuesday, August 14th, 2007 AT 4:42 AM

RASMATAZ