Air Con And Timing Chain Probs

[jvernon]

Hi all,

 

My first problem is my aircon. I have the dual aircon system (yep its got vents in the roof) and you probably recognise this dilema from other posts, but its blowing warm air! :D but only out of the front vents :lol: So I've narrowed it down to the heater flaps not shutting off correctly for the front blower motor. I remember reading somewhere in the forum that it's possible to recallibrate the climate control unit? Is this true and is it likely to be causing my problem? If so what's the procedure? If it's impossible to be the unit needing recallibration causing my fault then where exactly are the heater flaps? I assume they're behind the glove box somewhere with the evaporator/blower motor. Also the front evaporator doesnt appear to be draining any water :D is it possible that my evaporator is full of water and that is what's causing the warm air, im suspecting that its full of water because I can smell stale water coming from somewhere in the car but cant trace it, it does appear to be somewhere by the glove box and I've checked the carpet its bone dry :P I don't know is this is of any relevance but my outside temperature reading is wrong as well. Where is the sensor? I've seen something mentioned about a sunlight sensor as well? Is that just on the mk2's or could that be faulty as well?

 

I while back my engine started making the timing chain rattle noise and the startup noise (hydraulic tappets?) I replaced the top chain guide rail and tensioner bolt and it went quiet for a while but now its back with a vengeance. What could this be? Do you think the guide rail has broken again??? :D If so what could keep causing it to fail like this? I'm a steady driver normally and have been being extra careful since I replaced the guide rail just in case it was my driving that had caused it to break. Im now seriously considering taking the engine out just to find out what's going on because I'm worried about it snapping and wrecking my engine :P How am I supposed to figure out which tappet is nackered? Or is it a just replace them all job :P

 

Regards,

John

[Guest tonycoates]

Sorry this is not the solution.

 

I had a noise that sounded like timing chain rattle, but I thought, no, surely it is belt driven. The slap noise was at idle, or when the engine wasn't under load, went in a couple of days, puzzled!!!

[seatkid]

I had a noise that sounded like timing chain rattle, but I thought, no, surely it is belt driven. The slap noise was at idle, or when the engine wasn't under load, went in a couple of days, puzzled!!!

no....it is a chain.....2 chains actually.....

 

The upper chain is hydraulically tensioned, problems with tension and tappets (also hydraulic) point to a blocked oilway (or a plug dropped out) or faulty oil pump/pressure relief or even a blocked oil filter.

 

The lower chain tensioner is mechanical, and probably works on the old ratchet principle, so yes the slap will disappear when is slips onto the next rachet.