Discussion
When I had my Chimaera the perceived wisdom was that - A) why did you need a/c in a convertible, and B) TVR a/c never worked, Well, contrary to all opinions, I noticed on one occasion that the compressor was not clutching 'in'.
Took the car round to an ex-work colleague who knows his way around compressing gasses.
Upshot was that after a decent check - evacuate system, hold vacuum for ~ 20 mins, then if vac' holding, re-gas and add lube-oil. Absolutely icy cold air coming out of vents.
With the Tuscan, I think the biggest detractor from the system is the heater/a/c stepper motor and its associated flap. Said flap diverts cold air (or hot) into the dash plenum.
The issue is that the stepper motor is a flawed device, and the flap that it drives by bent wire(!!) is supposed to have a seal to cover the blown air outlet from the heater matrix.,,,,No doubt after ~ 15/20 years this seal has crumbled away....So, you're getting a mix of hot and cold air, rather than all the chilled air from the aircon evaporator matrix.
So - get the system regassed by someone who understands refrigeration/air conditioning. If that doesn't improve the output, then you've got to look at the flapper operation (Need to remove both 'humps' visible in engine bay/N.S inner wing area).
Nick. .
Took the car round to an ex-work colleague who knows his way around compressing gasses.
Upshot was that after a decent check - evacuate system, hold vacuum for ~ 20 mins, then if vac' holding, re-gas and add lube-oil. Absolutely icy cold air coming out of vents.
With the Tuscan, I think the biggest detractor from the system is the heater/a/c stepper motor and its associated flap. Said flap diverts cold air (or hot) into the dash plenum.
The issue is that the stepper motor is a flawed device, and the flap that it drives by bent wire(!!) is supposed to have a seal to cover the blown air outlet from the heater matrix.,,,,No doubt after ~ 15/20 years this seal has crumbled away....So, you're getting a mix of hot and cold air, rather than all the chilled air from the aircon evaporator matrix.
So - get the system regassed by someone who understands refrigeration/air conditioning. If that doesn't improve the output, then you've got to look at the flapper operation (Need to remove both 'humps' visible in engine bay/N.S inner wing area).
Nick. .
nawarne said:
When I had my Chimaera the perceived wisdom was that - A) why did you need a/c in a convertible, and B) TVR a/c never worked, Well, contrary to all opinions, I noticed on one occasion that the compressor was not clutching 'in'.
Took the car round to an ex-work colleague who knows his way around compressing gasses.
Upshot was that after a decent check - evacuate system, hold vacuum for ~ 20 mins, then if vac' holding, re-gas and add lube-oil. Absolutely icy cold air coming out of vents.
With the Tuscan, I think the biggest detractor from the system is the heater/a/c stepper motor and its associated flap. Said flap diverts cold air (or hot) into the dash plenum.
The issue is that the stepper motor is a flawed device, and the flap that it drives by bent wire(!!) is supposed to have a seal to cover the blown air outlet from the heater matrix.,,,,No doubt after ~ 15/20 years this seal has crumbled away....So, you're getting a mix of hot and cold air, rather than all the chilled air from the aircon evaporator matrix.
So - get the system regassed by someone who understands refrigeration/air conditioning. If that doesn't improve the output, then you've got to look at the flapper operation (Need to remove both 'humps' visible in engine bay/N.S inner wing area).
Nick. .
That's a great reply, I'll do exactly like you say. Are new /refurbished motors available from anywhere, or is the 'crumbly seal' available separately and easy to replace? Took the car round to an ex-work colleague who knows his way around compressing gasses.
Upshot was that after a decent check - evacuate system, hold vacuum for ~ 20 mins, then if vac' holding, re-gas and add lube-oil. Absolutely icy cold air coming out of vents.
With the Tuscan, I think the biggest detractor from the system is the heater/a/c stepper motor and its associated flap. Said flap diverts cold air (or hot) into the dash plenum.
The issue is that the stepper motor is a flawed device, and the flap that it drives by bent wire(!!) is supposed to have a seal to cover the blown air outlet from the heater matrix.,,,,No doubt after ~ 15/20 years this seal has crumbled away....So, you're getting a mix of hot and cold air, rather than all the chilled air from the aircon evaporator matrix.
So - get the system regassed by someone who understands refrigeration/air conditioning. If that doesn't improve the output, then you've got to look at the flapper operation (Need to remove both 'humps' visible in engine bay/N.S inner wing area).
Nick. .
I used a self-adhesive seal from boat building.
A good picture showing the flap can be seen here:
https://www.ebay.co.uk/itm/165553838544?hash=item2...
A good picture showing the flap can be seen here:
https://www.ebay.co.uk/itm/165553838544?hash=item2...
Granturadriver said:
I used a self-adhesive seal from boat building.
A good picture showing the flap can be seen here:
https://www.ebay.co.uk/itm/165553838544?hash=item2...
Thank you, very handy. 👍A good picture showing the flap can be seen here:
https://www.ebay.co.uk/itm/165553838544?hash=item2...
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