ECT = Engine Coolant Temperature sensor.

That’s why I link to the Volvo glossary in my signature, and now I have to figure out why it’s broken I have been backfilling threads with part numbers for about 2 years now, because there is no other way to make things searchable Volvo calls things crazy names , but numbers remain pure and searchab...

Nope, no difference for 93-00 FWD cars.

I don't know about the AWD cars.

On some of the compressors there is also a thermal breaker that engages if the compressor gets too hot... On the off chance you find the gap within spec.

You can use coolant gas testers to check for head gasket leaks and you may be able to borrow/rent a coolant system pressure tester. Be careful not to over pressurise the system as you can do more harm than good. If the leaks are not obvious then the harder ones to notice are: 1) Any coolant pipe con...

What scot850 said - rent a tester so you can put the system under pressure if the exhaust gas test is a negative. Odds are you have a very slow drip. How long ago did you do a cooling system refresh? Any hose over 10 years old should likely be replaced, if only for the fact it will be going soon at ...

Hydraulic, from FCP: Up To Engine Serial Number -1266127 (See Sticker on Timing Cover) https://www.fcpeuro.com/products/volvo-engine-timing-belt-tensioner-850-s70-v70-c70-9146693 Mechanical, from FCP: For vehicles with mechanical tensioner and direct ignition, engine range from 1266128 up to 3192745...

If it's similar to an 850 the worst part of the job is the T45 into the tensioner or roller or whatever it goes into. The wp wasn't that big of a deal, I don't remember being tough, I can't remember if I used some sort of sealant on the bolts though, a permatex of sorts. Maybe. https://www.youtube.c...

Coming from an S40, you sure that water pump fits your 98 NA? I'd probably use it if it does, or buy a Hepu if it doesn't. Front cam seals i still never touch unless they are leaking, regardless of mileage. If you do, they must be Corteco (or Volvo). Tensioner (is yours hydraulic or mechanical? 98 i...

Aisin is the brand of water pump to buy. Expect 25k life out of others

I would use a Conti belt, only , too.